Upgrade Version

.gitignore

@@ -32,9 +32,11 @@ Thumbs.db
 desktop.ini
 
 ## Agent Metadata
-.antigravitycli/
-.agent/
-GEMINI.md
+/.antigravitycli/
+/.agent/
+/GEMINI.md
+/.mcp.json
+/CLAUDE.md
 
 # Decompiled Game Code
 *.cs.txt
@@ -43,3 +45,7 @@ GEMINI.md
 /AsyncInputAutoplayFix.md
 /AudioMixerExplanation.md
 /O5Theme.md
+
+# Developer Utility Files
+/REVIEW_CHECKLIST.md
+/REVIEW_FFMPEG.md

API/FrameHookContext.cs

@@ -0,0 +1,302 @@
+using System;
+using System.Diagnostics.CodeAnalysis;
+using UnityEngine;
+using UnityEngine.Rendering;
+
+namespace ADOFAIRenderer.API;
+
+/// <summary>
+/// Execution context provided to frame modification hooks, managing GPU ping-pong double buffering.
+/// </summary>
+/// <remarks>
+/// <para>
+/// <b>Zero-Allocation Notice:</b> For maximum performance on the render hot path, the pipeline reuses context instances
+/// across frames. Do not cache the context instance itself across frames.
+/// </para>
+/// <para>
+/// <b>Execution Frequency Notice:</b> This hook is executed only when a frame is captured for video encoding.
+/// When <c>RenderFPS</c> exceeds <c>VideoFPS</c>, intermediate game rendering frames are skipped and the hook
+/// will <b>not</b> be invoked on every rendered game frame.
+/// </para>
+/// </remarks>
+[SuppressMessage("ReSharper", "UnusedType.Global")]
+[SuppressMessage("ReSharper", "UnusedMember.Global")]
+[SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
+[SuppressMessage("ReSharper", "UnusedAutoPropertyAccessor.Global")]
+public class FrameHookContext
+{
+    private RenderTexture _originalSource = null!;
+    private RenderTexture _pingRT = null!;
+    private RenderTexture _pongRT = null!;
+
+    private RenderTexture _currentSource = null!;
+    private RenderTexture _currentDestination = null!;
+    private bool _hasModified;
+
+    /// <summary>
+    /// The input <see cref="RenderTexture"/> containing the rendered frame before the current pass.
+    /// </summary>
+    public RenderTexture Source => _currentSource;
+
+    /// <summary>
+    /// The writable destination <see cref="RenderTexture"/> for the current pass.
+    /// </summary>
+    public RenderTexture Destination => _currentDestination;
+
+    /// <summary>
+    /// The active <see cref="RenderTexture"/> representing the current state of the modified frame.
+    /// </summary>
+    public RenderTexture Current => _currentSource;
+
+    /// <summary>
+    /// The original unmodified render texture captured from the game for the current frame before any hooks were applied.
+    /// </summary>
+    public RenderTexture OriginalSource => _originalSource;
+
+    /// <summary>
+    /// Indicates whether any modifications or swaps have been applied to this frame.
+    /// </summary>
+    public bool HasModified => _hasModified;
+
+    /// <summary>
+    /// The sequential 0-based index of the video frame currently being encoded.
+    /// </summary>
+    public long FrameIndex { get; private set; }
+
+    /// <summary>
+    /// Alias for <see cref="FrameIndex"/>. The sequential 0-based index of the video frame.
+    /// </summary>
+    public long VideoFrameIndex => FrameIndex;
+
+    /// <summary>
+    /// The sequential 0-based index of the game render frame.
+    /// </summary>
+    public long RenderFrameIndex { get; private set; }
+
+    /// <summary>
+    /// The timestamp of the current frame in seconds relative to video start.
+    /// </summary>
+    public double VideoTime { get; private set; }
+
+    /// <summary>
+    /// The delta time duration in seconds of a single video frame (equivalent to 1.0 / VideoFPS).
+    /// </summary>
+    public double DeltaTime => VideoFPS > 0 ? 1.0 / VideoFPS : 0.0;
+
+    /// <summary>
+    /// The width of the frame in pixels.
+    /// </summary>
+    public int Width => _currentSource.width;
+
+    /// <summary>
+    /// The height of the frame in pixels.
+    /// </summary>
+    public int Height => _currentSource.height;
+
+    /// <summary>
+    /// The configured render frames per second.
+    /// </summary>
+    public double RenderFPS { get; private set; }
+
+    /// <summary>
+    /// The output video frames per second.
+    /// </summary>
+    public double VideoFPS { get; private set; }
+
+    /// <summary>
+    /// The number of successful modification passes completed for the current frame.
+    /// </summary>
+    public int PassCount { get; private set; }
+
+    internal FrameHookContext(
+        RenderTexture originalSource,
+        RenderTexture pingRT,
+        RenderTexture pongRT,
+        RenderTexture firstDestination,
+        long frameIndex,
+        long renderFrameIndex,
+        double videoTime,
+        double renderFps,
+        double videoFps)
+    {
+        Reset(originalSource, pingRT, pongRT, firstDestination, frameIndex, renderFrameIndex, videoTime, renderFps, videoFps);
+    }
+
+    internal void Reset(
+        RenderTexture originalSource,
+        RenderTexture pingRT,
+        RenderTexture pongRT,
+        RenderTexture firstDestination,
+        long frameIndex,
+        long renderFrameIndex,
+        double videoTime,
+        double renderFps,
+        double videoFps)
+    {
+        _originalSource = originalSource;
+        _pingRT = pingRT;
+        _pongRT = pongRT;
+
+        _currentSource = originalSource;
+        _currentDestination = firstDestination;
+        _hasModified = false;
+        PassCount = 0;
+
+        FrameIndex = frameIndex;
+        RenderFrameIndex = renderFrameIndex;
+        VideoTime = videoTime;
+        RenderFPS = renderFps;
+        VideoFPS = videoFps;
+    }
+
+    /// <summary>
+    /// Blits from <see cref="Source"/> to <see cref="Destination"/> using the specified <see cref="Material"/> and automatically swaps ping-pong buffers.
+    /// </summary>
+    /// <param name="material">The material containing the shader to apply, or <c>null</c> for a standard copy.</param>
+    /// <param name="pass">The shader pass index to use, or -1 to execute all passes.</param>
+    public void Blit(Material? material = null, int pass = -1)
+    {
+        if (material != null)
+        {
+            if (pass >= 0)
+                Graphics.Blit(_currentSource, _currentDestination, material, pass);
+            else
+                Graphics.Blit(_currentSource, _currentDestination, material);
+        }
+        else
+        {
+            Graphics.Blit(_currentSource, _currentDestination);
+        }
+
+        Swap();
+    }
+
+    /// <summary>
+    /// Blits from a custom source <see cref="Texture"/> to <see cref="Destination"/> using the specified <see cref="Material"/> and automatically swaps ping-pong buffers.
+    /// </summary>
+    /// <param name="customSource">The custom source texture to blit from.</param>
+    /// <param name="material">The material containing the shader to apply, or <c>null</c> for a standard copy.</param>
+    /// <param name="pass">The shader pass index to use, or -1 to execute all passes.</param>
+    /// <exception cref="ArgumentNullException">Thrown when <paramref name="customSource"/> is null.</exception>
+    public void Blit(Texture customSource, Material? material = null, int pass = -1)
+    {
+        if (customSource == null) throw new ArgumentNullException(nameof(customSource));
+
+        if (material != null)
+        {
+            if (pass >= 0)
+                Graphics.Blit(customSource, _currentDestination, material, pass);
+            else
+                Graphics.Blit(customSource, _currentDestination, material);
+        }
+        else
+        {
+            Graphics.Blit(customSource, _currentDestination);
+        }
+
+        Swap();
+    }
+
+    /// <summary>
+    /// Copies the contents of <see cref="Source"/> into <see cref="Destination"/> without swapping buffers.
+    /// Call this before drawing custom overlays into <see cref="Destination"/> if you wish to preserve the background.
+    /// </summary>
+    public void Copy()
+    {
+        Graphics.Blit(_currentSource, _currentDestination);
+    }
+
+    /// <summary>
+    /// Clears <see cref="Destination"/> with the specified color.
+    /// </summary>
+    /// <param name="clearColor">The color to clear with, or <c>null</c> for <see cref="Color.clear"/>.</param>
+    public void ClearDestination(Color? clearColor = null)
+    {
+        var prev = RenderTexture.active;
+        try
+        {
+            RenderTexture.active = _currentDestination;
+            GL.Clear(false, true, clearColor ?? Color.clear);
+        }
+        finally
+        {
+            RenderTexture.active = prev;
+        }
+    }
+
+    /// <summary>
+    /// Temporarily activates <see cref="Destination"/> as <see cref="RenderTexture.active"/> to perform custom draw calls,
+    /// safely restoring the previous active RenderTexture afterwards.
+    /// </summary>
+    /// <param name="drawAction">The action that performs custom draw operations.</param>
+    /// <param name="autoSwap">If <c>true</c> (default), automatically calls <see cref="Swap"/> after drawing.</param>
+    /// <param name="preserveBackground">If <c>true</c>, copies <see cref="Source"/> into <see cref="Destination"/> before executing <paramref name="drawAction"/>.</param>
+    /// <exception cref="ArgumentNullException">Thrown when <paramref name="drawAction"/> is null.</exception>
+    public void DrawToDestination(Action drawAction, bool autoSwap = true, bool preserveBackground = false)
+    {
+        if (drawAction == null) throw new ArgumentNullException(nameof(drawAction));
+
+        if (preserveBackground)
+        {
+            Copy();
+        }
+
+        var prev = RenderTexture.active;
+        try
+        {
+            RenderTexture.active = _currentDestination;
+            drawAction();
+        }
+        finally
+        {
+            RenderTexture.active = prev;
+        }
+
+        if (autoSwap)
+        {
+            Swap();
+        }
+    }
+
+    /// <summary>
+    /// Executes a <see cref="CommandBuffer"/> against the GPU and optionally swaps buffers.
+    /// </summary>
+    /// <param name="commandBuffer">The command buffer to execute.</param>
+    /// <param name="autoSwap">If <c>true</c> (default), automatically calls <see cref="Swap"/> after execution.</param>
+    /// <exception cref="ArgumentNullException">Thrown when <paramref name="commandBuffer"/> is null.</exception>
+    public void ExecuteCommandBuffer(CommandBuffer commandBuffer, bool autoSwap = true)
+    {
+        if (commandBuffer == null) throw new ArgumentNullException(nameof(commandBuffer));
+        Graphics.ExecuteCommandBuffer(commandBuffer);
+        if (autoSwap)
+        {
+            Swap();
+        }
+    }
+
+    /// <summary>
+    /// Swaps the active <see cref="Source"/> and <see cref="Destination"/> ping-pong buffers.
+    /// Call this after manually writing or rendering into <see cref="Destination"/> so that subsequent hooks or the video encoder read the updated frame.
+    /// </summary>
+    public void Swap()
+    {
+        _hasModified = true;
+        PassCount++;
+
+        var previousDestination = _currentDestination;
+        _currentSource = previousDestination;
+        _currentDestination = (previousDestination == _pingRT) ? _pongRT : _pingRT;
+    }
+
+    /// <summary>
+    /// Replaces the current modified frame texture with a custom <see cref="RenderTexture"/>.
+    /// </summary>
+    /// <param name="customTexture">The custom texture to set as the active frame.</param>
+    /// <exception cref="ArgumentNullException">Thrown when <paramref name="customTexture"/> is null.</exception>
+    public void ReplaceCurrent(RenderTexture customTexture)
+    {
+        _currentSource = customTexture ?? throw new ArgumentNullException(nameof(customTexture));
+        _hasModified = true;
+        PassCount++;
+    }
+}

API/IFrameHook.cs

@@ -0,0 +1,24 @@
+using System.Diagnostics.CodeAnalysis;
+
+namespace ADOFAIRenderer.API;
+
+/// <summary>
+/// Represents a custom frame modification hook that can modify rendered frames using GPU ping-pong double buffering.
+/// </summary>
+/// <remarks>
+/// <b>Execution Frequency Note:</b> Frame hooks are only invoked for frames that are actually encoded into the final video (<c>VideoFPS</c>).
+/// When <c>RenderFPS</c> is higher than <c>VideoFPS</c>, intermediate game render frames are skipped and this hook
+/// will <b>not</b> be called on every game frame.
+/// </remarks>
+[SuppressMessage("ReSharper", "UnusedType.Global")]
+public interface IFrameHook
+{
+    /// <summary>
+    /// Invoked for each captured video frame before it is encoded.
+    /// </summary>
+    /// <remarks>
+    /// This method is not called on every rendered game frame if <c>RenderFPS</c> exceeds <c>VideoFPS</c>.
+    /// </remarks>
+    /// <param name="context">The frame hook context providing access to ping-pong textures and frame metadata.</param>
+    void OnRenderFrame(FrameHookContext context);
+}

API/RenderSession.cs

@@ -1,9 +1,11 @@
 using System;
+using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.IO;
 using ADOFAIRenderer.Core;
 using ADOFAIRenderer.Data;
 using ADOFAIRenderer.Util;
+using UnityEngine;
 
 namespace ADOFAIRenderer.API;
 
@@ -11,8 +13,47 @@ namespace ADOFAIRenderer.API;
 /// Fluent builder for configuring and starting a render session.
 /// </summary>
 [SuppressMessage("ReSharper", "UnusedType.Global")]
+[SuppressMessage("ReSharper", "UnusedMember.Global")]
+[SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
 public class RenderSession
 {
+    private sealed class GlobalHookRegistration : IDisposable
+    {
+        public object Key { get; }
+        public Action<FrameHookContext> Action { get; }
+        private bool _isDisposed;
+
+        public GlobalHookRegistration(object key, Action<FrameHookContext> action)
+        {
+            Key = key;
+            Action = action;
+        }
+
+        public void Dispose()
+        {
+            if (_isDisposed) return;
+            _isDisposed = true;
+            RemoveGlobalRegistration(this);
+        }
+    }
+
+    private sealed class SessionHookEntry
+    {
+        public object Key { get; }
+        public Action<FrameHookContext> Action { get; }
+
+        public SessionHookEntry(object key, Action<FrameHookContext> action)
+        {
+            Key = key;
+            Action = action;
+        }
+    }
+
+    private static readonly List<GlobalHookRegistration> GlobalFrameHooks = new();
+    private static readonly object GlobalHooksLock = new();
+    private static int _globalHooksVersion;
+
+    private readonly List<SessionHookEntry> _frameHooks = new();
     private bool _auto = true;
 
     /// <summary>
@@ -126,6 +167,331 @@ public class RenderSession
         return this;
     }
 
+    /// <summary>
+    /// Adds a custom frame modification hook to be executed for each encoded video frame.
+    /// The hook can modify the rendered frame using GPU ping-pong double buffering.
+    /// </summary>
+    /// <remarks>
+    /// <b>Execution Frequency Note:</b> This hook is invoked only for frames that are captured for the output video.
+    /// When <c>RenderFPS</c> is higher than <c>VideoFPS</c>, intermediate game render frames are skipped,
+    /// so this hook will <b>not</b> be called on every game frame.
+    /// </remarks>
+    /// <param name="hook">The callback action that receives a <see cref="FrameHookContext"/>.</param>
+    /// <returns>The current <see cref="RenderSession"/> instance for method chaining.</returns>
+    /// <exception cref="ArgumentNullException">Thrown when <paramref name="hook"/> is null.</exception>
+    public RenderSession AddFrameHook(Action<FrameHookContext> hook)
+    {
+        if (hook == null) throw new ArgumentNullException(nameof(hook));
+        _frameHooks.Add(new SessionHookEntry(hook, hook));
+        return this;
+    }
+
+    /// <summary>
+    /// Adds a material-based post-processing pass to be executed for each encoded video frame.
+    /// Automatically performs a GPU blit from source to destination and swaps buffers.
+    /// </summary>
+    /// <param name="material">The material containing the shader to apply.</param>
+    /// <param name="pass">The shader pass index to use, or -1 to execute all passes.</param>
+    /// <returns>The current <see cref="RenderSession"/> instance for method chaining.</returns>
+    /// <exception cref="ArgumentNullException">Thrown when <paramref name="material"/> is null.</exception>
+    public RenderSession AddFrameHook(Material material, int pass = -1)
+    {
+        if (material is null) throw new ArgumentNullException(nameof(material));
+        _frameHooks.Add(new SessionHookEntry(material, context => context.Blit(material, pass)));
+        return this;
+    }
+
+    /// <summary>
+    /// Adds a custom frame modification hook implementing <see cref="IFrameHook"/>.
+    /// </summary>
+    /// <param name="hook">The hook instance to execute.</param>
+    /// <returns>The current <see cref="RenderSession"/> instance for method chaining.</returns>
+    /// <exception cref="ArgumentNullException">Thrown when <paramref name="hook"/> is null.</exception>
+    public RenderSession AddFrameHook(IFrameHook hook)
+    {
+        if (hook == null) throw new ArgumentNullException(nameof(hook));
+        _frameHooks.Add(new SessionHookEntry(hook, hook.OnRenderFrame));
+        return this;
+    }
+
+    /// <summary>
+    /// Alias for <see cref="AddFrameHook(Action{FrameHookContext})"/>.
+    /// </summary>
+    /// <param name="hook">The callback action that receives a <see cref="FrameHookContext"/>.</param>
+    /// <returns>The current <see cref="RenderSession"/> instance for method chaining.</returns>
+    public RenderSession WithFrameHook(Action<FrameHookContext> hook) => AddFrameHook(hook);
+
+    /// <summary>
+    /// Alias for <see cref="AddFrameHook(Material, int)"/>.
+    /// </summary>
+    /// <param name="material">The material containing the shader to apply.</param>
+    /// <param name="pass">The shader pass index to use, or -1 to execute all passes.</param>
+    /// <returns>The current <see cref="RenderSession"/> instance for method chaining.</returns>
+    public RenderSession WithFrameHook(Material material, int pass = -1) => AddFrameHook(material, pass);
+
+    /// <summary>
+    /// Alias for <see cref="AddFrameHook(IFrameHook)"/>.
+    /// </summary>
+    /// <param name="hook">The hook instance to execute.</param>
+    /// <returns>The current <see cref="RenderSession"/> instance for method chaining.</returns>
+    public RenderSession WithFrameHook(IFrameHook hook) => AddFrameHook(hook);
+
+    /// <summary>
+    /// Removes a previously added frame modification hook callback from this session.
+    /// </summary>
+    /// <param name="hook">The hook action to remove.</param>
+    /// <returns>The current <see cref="RenderSession"/> instance for method chaining.</returns>
+    public RenderSession RemoveFrameHook(Action<FrameHookContext> hook)
+    {
+        var idx = _frameHooks.FindIndex(e => ReferenceEquals(e.Key, hook) || Equals(e.Action, hook));
+        if (idx >= 0) _frameHooks.RemoveAt(idx);
+        return this;
+    }
+
+    /// <summary>
+    /// Removes a previously added material-based post-processing pass from this session.
+    /// </summary>
+    /// <param name="material">The material to remove.</param>
+    /// <returns>The current <see cref="RenderSession"/> instance for method chaining.</returns>
+    public RenderSession RemoveFrameHook(Material material)
+    {
+        if (material)
+        {
+            for (var i = _frameHooks.Count - 1; i >= 0; i--)
+            {
+                if (ReferenceEquals(_frameHooks[i].Key, material))
+                {
+                    _frameHooks.RemoveAt(i);
+                }
+            }
+        }
+        return this;
+    }
+
+    /// <summary>
+    /// Removes a previously added <see cref="IFrameHook"/> from this session.
+    /// </summary>
+    /// <param name="hook">The hook instance to remove.</param>
+    /// <returns>The current <see cref="RenderSession"/> instance for method chaining.</returns>
+    public RenderSession RemoveFrameHook(IFrameHook hook)
+    {
+        var idx = _frameHooks.FindIndex(e => ReferenceEquals(e.Key, hook));
+        if (idx >= 0) _frameHooks.RemoveAt(idx);
+        return this;
+    }
+
+    /// <summary>
+    /// Clears all frame modification hooks configured for this render session.
+    /// </summary>
+    /// <returns>The current <see cref="RenderSession"/> instance for method chaining.</returns>
+    public RenderSession ClearFrameHooks()
+    {
+        _frameHooks.Clear();
+        return this;
+    }
+
+    /// <summary>
+    /// Registers a global frame modification hook that will execute on every render session.
+    /// </summary>
+    /// <remarks>
+    /// <b>Execution Frequency Note:</b> Global frame hooks are executed only for frames that are captured for the output video.
+    /// When <c>RenderFPS</c> is higher than <c>VideoFPS</c>, intermediate game render frames are skipped,
+    /// so this hook will <b>not</b> be called on every game frame.
+    /// </remarks>
+    /// <param name="hook">The callback action that receives a <see cref="FrameHookContext"/>.</param>
+    /// <returns>An <see cref="IDisposable"/> registration handle that unregisters the hook when disposed.</returns>
+    /// <exception cref="ArgumentNullException">Thrown when <paramref name="hook"/> is null.</exception>
+    public static IDisposable AddGlobalFrameHook(Action<FrameHookContext> hook)
+    {
+        if (hook == null) throw new ArgumentNullException(nameof(hook));
+        var reg = new GlobalHookRegistration(hook, hook);
+        lock (GlobalHooksLock)
+        {
+            GlobalFrameHooks.Add(reg);
+            _globalHooksVersion++;
+        }
+        return reg;
+    }
+
+    /// <summary>
+    /// Registers a global material-based post-processing pass that will execute on every render session.
+    /// </summary>
+    /// <param name="material">The material containing the shader to apply.</param>
+    /// <param name="pass">The shader pass index to use, or -1 to execute all passes.</param>
+    /// <returns>An <see cref="IDisposable"/> registration handle that unregisters the hook when disposed.</returns>
+    /// <exception cref="ArgumentNullException">Thrown when <paramref name="material"/> is null.</exception>
+    public static IDisposable AddGlobalFrameHook(Material material, int pass = -1)
+    {
+        if (material is null) throw new ArgumentNullException(nameof(material));
+        var reg = new GlobalHookRegistration(material, context => context.Blit(material, pass));
+        lock (GlobalHooksLock)
+        {
+            GlobalFrameHooks.Add(reg);
+            _globalHooksVersion++;
+        }
+        return reg;
+    }
+
+    /// <summary>
+    /// Registers a global frame modification hook implementing <see cref="IFrameHook"/>.
+    /// </summary>
+    /// <param name="hook">The hook instance to execute.</param>
+    /// <returns>An <see cref="IDisposable"/> registration handle that unregisters the hook when disposed.</returns>
+    /// <exception cref="ArgumentNullException">Thrown when <paramref name="hook"/> is null.</exception>
+    public static IDisposable AddGlobalFrameHook(IFrameHook hook)
+    {
+        if (hook == null) throw new ArgumentNullException(nameof(hook));
+        var reg = new GlobalHookRegistration(hook, hook.OnRenderFrame);
+        lock (GlobalHooksLock)
+        {
+            GlobalFrameHooks.Add(reg);
+            _globalHooksVersion++;
+        }
+        return reg;
+    }
+
+    /// <summary>
+    /// Unregisters a previously registered global frame modification hook.
+    /// </summary>
+    /// <param name="hook">The hook action to remove.</param>
+    /// <returns><c>true</c> if the hook was successfully removed; otherwise, <c>false</c>.</returns>
+    public static bool RemoveGlobalFrameHook(Action<FrameHookContext> hook)
+    {
+        lock (GlobalHooksLock)
+        {
+            var idx = GlobalFrameHooks.FindIndex(r => ReferenceEquals(r.Key, hook) || Equals(r.Action, hook));
+            if (idx >= 0)
+            {
+                GlobalFrameHooks.RemoveAt(idx);
+                _globalHooksVersion++;
+                return true;
+            }
+            return false;
+        }
+    }
+
+    /// <summary>
+    /// Unregisters a previously registered global material-based post-processing pass.
+    /// </summary>
+    /// <param name="material">The material to remove.</param>
+    /// <returns><c>true</c> if any hooks matching <paramref name="material"/> were removed; otherwise, <c>false</c>.</returns>
+    public static bool RemoveGlobalFrameHook(Material material)
+    {
+        lock (GlobalHooksLock)
+        {
+            var removed = false;
+            for (var i = GlobalFrameHooks.Count - 1; i >= 0; i--)
+            {
+                if (ReferenceEquals(GlobalFrameHooks[i].Key, material))
+                {
+                    GlobalFrameHooks.RemoveAt(i);
+                    removed = true;
+                }
+            }
+            if (removed)
+            {
+                _globalHooksVersion++;
+            }
+            return removed;
+        }
+    }
+
+    /// <summary>
+    /// Unregisters a previously registered global frame modification hook implementing <see cref="IFrameHook"/>.
+    /// </summary>
+    /// <param name="hook">The hook instance to remove.</param>
+    /// <returns><c>true</c> if the hook was successfully removed; otherwise, <c>false</c>.</returns>
+    public static bool RemoveGlobalFrameHook(IFrameHook hook)
+    {
+        lock (GlobalHooksLock)
+        {
+            var idx = GlobalFrameHooks.FindIndex(r => ReferenceEquals(r.Key, hook));
+            if (idx >= 0)
+            {
+                GlobalFrameHooks.RemoveAt(idx);
+                _globalHooksVersion++;
+                return true;
+            }
+            return false;
+        }
+    }
+
+    private static void RemoveGlobalRegistration(GlobalHookRegistration registration)
+    {
+        lock (GlobalHooksLock)
+        {
+            if (GlobalFrameHooks.Remove(registration))
+            {
+                _globalHooksVersion++;
+            }
+        }
+    }
+
+    /// <summary>
+    /// Clears all registered global frame modification hooks.
+    /// </summary>
+    public static void ClearGlobalFrameHooks()
+    {
+        lock (GlobalHooksLock)
+        {
+            if (GlobalFrameHooks.Count > 0)
+            {
+                GlobalFrameHooks.Clear();
+                _globalHooksVersion++;
+            }
+        }
+    }
+
+    /// <summary>
+    /// Indicates whether any global frame modification hooks are currently registered.
+    /// </summary>
+    public static bool HasGlobalFrameHooks
+    {
+        get
+        {
+            lock (GlobalHooksLock)
+            {
+                return GlobalFrameHooks.Count > 0;
+            }
+        }
+    }
+
+    /// <summary>
+    /// The number of currently registered global frame modification hooks.
+    /// </summary>
+    public static int GlobalFrameHookCount
+    {
+        get
+        {
+            lock (GlobalHooksLock)
+            {
+                return GlobalFrameHooks.Count;
+            }
+        }
+    }
+
+    internal static int GlobalHooksVersion
+    {
+        get
+        {
+            lock (GlobalHooksLock)
+            {
+                return _globalHooksVersion;
+            }
+        }
+    }
+
+    internal static void CopyGlobalFrameHooksTo(List<Action<FrameHookContext>> destination)
+    {
+        lock (GlobalHooksLock)
+        {
+            for (var i = 0; i < GlobalFrameHooks.Count; i++)
+            {
+                destination.Add(GlobalFrameHooks[i].Action);
+            }
+        }
+    }
+
     /// <summary>
     /// Applies the configured flags and initiates the render session.
     /// </summary>
@@ -144,6 +510,15 @@ public class RenderSession
         if (_onComplete is not null) RenderContext.OnComplete = _onComplete;
         if (_onLastUpdate is not null) RenderContext.OnLastUpdate = _onLastUpdate;
 
+        RenderContext.SessionFrameHooks.Clear();
+        if (_frameHooks.Count > 0)
+        {
+            foreach (var t in _frameHooks)
+            {
+                RenderContext.SessionFrameHooks.Add(t.Action);
+            }
+        }
+        
         RenderManager.Instance.levelPath = levelPath;
         RenderManager.Instance.Configuration = renderConfig;
 

Core/Data/GlobalSettings.cs

@@ -6,20 +6,28 @@ using Newtonsoft.Json;
 
 namespace ADOFAIRenderer.Core.Data;
 
-public class GlobalConfig
+internal class GlobalConfig
 {
     public string? OutputDirectory { get; set; }
+    public string? LastPresetName { get; set; }
+    public bool DefaultPresetsInitialized { get; set; }
 }
 
-public static class GlobalSettings
+internal static class GlobalSettings
 {
-    private static string SettingsFilePath =>
-        Path.Combine(MelonEnvironment.GameRootDirectory, "UserData", "ADOFAIRenderer", "global_settings.json");
+    private static string GetGameRootDir()
+    {
+        var root = MelonEnvironment.GameRootDirectory;
+        return string.IsNullOrEmpty(root) ? AppDomain.CurrentDomain.BaseDirectory : root;
+    }
 
-    public static GlobalConfig Current { get; set; } = new();
+    private static string SettingsFilePath =>
+        Path.Combine(GetGameRootDir(), "UserData", "ADOFAIRenderer", "global_settings.json");
+
+    public static GlobalConfig Current { get; private set; } = new();
 
     public static string DefaultOutputDirectory =>
-        Path.Combine(MelonEnvironment.GameRootDirectory, "Render");
+        Path.Combine(GetGameRootDir(), "Render");
 
     public static string EffectiveOutputDirectory
     {

Core/FrameHookPipeline.cs

@@ -0,0 +1,189 @@
+using System;
+using System.Collections.Generic;
+using ADOFAIRenderer.API;
+using MelonLoader;
+using UnityEngine;
+
+namespace ADOFAIRenderer.Core;
+
+internal class FrameHookPipeline : IDisposable
+{
+    private RenderTexture? _pingRT;
+    private RenderTexture? _pongRT;
+    private RenderTexture? _lastOutputRT;
+    private FrameHookContext? _reusableContext;
+    private int _width;
+    private int _height;
+    private RenderTextureFormat _format;
+
+    public RenderTexture? Process(
+        RenderTexture sourceTexture,
+        long frameIndex,
+        long renderFrameIndex,
+        double videoTime,
+        double renderFps,
+        double videoFps,
+        IReadOnlyList<Action<FrameHookContext>> hooks)
+    {
+        if (hooks.Count == 0 || !sourceTexture || !sourceTexture.IsCreated())
+            return sourceTexture;
+
+        EnsureBuffers(sourceTexture);
+
+        if (!_pingRT || !_pongRT || !_pingRT.IsCreated() || !_pongRT.IsCreated())
+            return sourceTexture;
+
+        var prevActive = RenderTexture.active;
+        try
+        {
+            // Inter-frame ping-pong safety: start with the buffer that was NOT used as the output
+            // of the previous frame, ensuring the buffer currently being read back is not immediately overwritten.
+            var firstDestination = _lastOutputRT == _pingRT ? _pongRT : _pingRT;
+
+            if (_reusableContext == null)
+            {
+                _reusableContext = new FrameHookContext(
+                    sourceTexture,
+                    _pingRT,
+                    _pongRT,
+                    firstDestination,
+                    frameIndex,
+                    renderFrameIndex,
+                    videoTime,
+                    renderFps,
+                    videoFps
+                );
+            }
+            else
+            {
+                _reusableContext.Reset(
+                    sourceTexture,
+                    _pingRT,
+                    _pongRT,
+                    firstDestination,
+                    frameIndex,
+                    renderFrameIndex,
+                    videoTime,
+                    renderFps,
+                    videoFps
+                );
+            }
+
+            for (var i = 0; i < hooks.Count; i++)
+            {
+                try
+                {
+                    hooks[i](_reusableContext);
+                }
+                catch (Exception ex)
+                {
+                    Melon<RenderMod>.Logger.Error($"[FrameHook] Error executing frame hook #{i} on frame {frameIndex}: {ex}");
+                }
+            }
+
+            var result = _reusableContext.Current;
+            _lastOutputRT = _reusableContext.HasModified ? result : null;
+            return result;
+        }
+        finally
+        {
+            RenderTexture.active = prevActive;
+        }
+    }
+
+    private void EnsureBuffers(RenderTexture sourceTexture)
+    {
+        var width = sourceTexture.width;
+        var height = sourceTexture.height;
+        var format = sourceTexture.format;
+
+        if (_pingRT && _pongRT &&
+            _width == width && _height == height && _format == format &&
+            _pingRT.IsCreated() && _pongRT.IsCreated())
+        {
+            return;
+        }
+
+        ReleaseBuffers();
+
+        _width = width;
+        _height = height;
+        _format = format;
+
+        try
+        {
+            var desc = sourceTexture.descriptor;
+            desc.depthBufferBits = 0;
+            desc.msaaSamples = 1;
+            desc.useMipMap = false;
+            desc.autoGenerateMips = false;
+
+            var supportsUav = SystemInfo.supportsComputeShaders &&
+                              SystemInfo.SupportsRandomWriteOnRenderTextureFormat(desc.colorFormat);
+            desc.enableRandomWrite = supportsUav;
+
+            _pingRT = new RenderTexture(desc)
+            {
+                name = "ADOFAIRenderer_PingBuffer",
+                filterMode = sourceTexture.filterMode,
+                wrapMode = sourceTexture.wrapMode
+            };
+            _pingRT.Create();
+
+            _pongRT = new RenderTexture(desc)
+            {
+                name = "ADOFAIRenderer_PongBuffer",
+                filterMode = sourceTexture.filterMode,
+                wrapMode = sourceTexture.wrapMode
+            };
+            _pongRT.Create();
+        }
+        catch (Exception ex)
+        {
+            ReleaseBuffers();
+            Melon<RenderMod>.Logger.Warning($"[FrameHook] Failed to create descriptor-based PingPong RTs: {ex.Message}. Falling back to standard ARGB32.");
+            _pingRT = new RenderTexture(width, height, 0, RenderTextureFormat.ARGB32)
+            {
+                name = "ADOFAIRenderer_PingBuffer",
+                filterMode = sourceTexture.filterMode,
+                wrapMode = sourceTexture.wrapMode
+            };
+            _pingRT.Create();
+
+            _pongRT = new RenderTexture(width, height, 0, RenderTextureFormat.ARGB32)
+            {
+                name = "ADOFAIRenderer_PongBuffer",
+                filterMode = sourceTexture.filterMode,
+                wrapMode = sourceTexture.wrapMode
+            };
+            _pongRT.Create();
+        }
+    }
+
+    public void ReleaseBuffers()
+    {
+        if (_pingRT)
+        {
+            if (_pingRT.IsCreated()) _pingRT.Release();
+            UnityEngine.Object.Destroy(_pingRT);
+            _pingRT = null;
+        }
+
+        if (_pongRT)
+        {
+            if (_pongRT.IsCreated()) _pongRT.Release();
+            UnityEngine.Object.Destroy(_pongRT);
+            _pongRT = null;
+        }
+
+        _width = 0;
+        _height = 0;
+        _lastOutputRT = null;
+        _reusableContext = null;
+    }
+
+    public void Dispose()
+    {
+        ReleaseBuffers();
+    }
+}

Core/PresetManager.cs

@@ -2,24 +2,118 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using ADOFAIRenderer.Core.Data;
+using ADOFAIRenderer.Data;
 using MelonLoader;
 using MelonLoader.Utils;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 
-namespace ADOFAIRenderer.Data;
+namespace ADOFAIRenderer.Core;
 
-internal class RenderPreset
+public class RenderPreset
 {
     public string Name { get; set; } = string.Empty;
     public RenderConfig Config { get; set; } = null!;
+
+    public RenderPreset Clone()
+    {
+        return new RenderPreset
+        {
+            Name = Name,
+            Config = Config.Clone()
+        };
+    }
 }
 
-internal static class PresetManager
+public static class PresetManager
 {
+    private static readonly List<RenderPreset> DefaultPresets = new()
+    {
+        new RenderPreset
+        {
+            Name = "FHD 60fps (1x)",
+            Config = new RenderConfig
+            {
+                RenderWidth = 1920,
+                RenderHeight = 1080,
+                RenderFPS = 60,
+                VideoFPS = 60,
+                DelayAfterEnd = 15,
+                ShowJudgementText = false,
+                VideoConfig = new VideoEncodingConfig { Codec = Codec.H264, RateControlMode = RateControlMode.CBR, Bitrate = 20000, MaxBitrate = 35000, QP = 18, KeyframeInterval = 2.0 },
+                AudioConfig = new AudioEncodingConfig { RenderAudio = true, AudioSampleRate = 48000, AudioChannels = 2, AudioBitrate = 256000 },
+                AdvancedConfig = new AdvancedConfig { ProcessAudio = true, NonTile = false, FileExtension = "mkv" }
+            }
+        },
+        new RenderPreset
+        {
+            Name = "FHD 60fps (4x)",
+            Config = new RenderConfig
+            {
+                RenderWidth = 1920,
+                RenderHeight = 1080,
+                RenderFPS = 240,
+                VideoFPS = 60,
+                DelayAfterEnd = 15,
+                ShowJudgementText = false,
+                VideoConfig = new VideoEncodingConfig { Codec = Codec.H264, RateControlMode = RateControlMode.CBR, Bitrate = 30000, MaxBitrate = 50000, QP = 18, KeyframeInterval = 2.0 },
+                AudioConfig = new AudioEncodingConfig { RenderAudio = true, AudioSampleRate = 48000, AudioChannels = 2, AudioBitrate = 256000 },
+                AdvancedConfig = new AdvancedConfig { ProcessAudio = true, NonTile = false, FileExtension = "mkv" }
+            }
+        },
+        new RenderPreset
+        {
+            Name = "QHD 60fps (4x)",
+            Config = new RenderConfig
+            {
+                RenderWidth = 2560,
+                RenderHeight = 1440,
+                RenderFPS = 240,
+                VideoFPS = 60,
+                DelayAfterEnd = 15,
+                ShowJudgementText = false,
+                VideoConfig = new VideoEncodingConfig { Codec = Codec.H264, RateControlMode = RateControlMode.CBR, Bitrate = 35000, MaxBitrate = 60000, QP = 18, KeyframeInterval = 2.0 },
+                AudioConfig = new AudioEncodingConfig { RenderAudio = true, AudioSampleRate = 48000, AudioChannels = 2, AudioBitrate = 256000 },
+                AdvancedConfig = new AdvancedConfig { ProcessAudio = true, NonTile = false, FileExtension = "mkv" }
+            }
+        },
+        new RenderPreset
+        {
+            Name = "4K 60fps (4x)",
+            Config = new RenderConfig
+            {
+                RenderWidth = 3840,
+                RenderHeight = 2160,
+                RenderFPS = 240,
+                VideoFPS = 60,
+                DelayAfterEnd = 15,
+                ShowJudgementText = false,
+                VideoConfig = new VideoEncodingConfig { Codec = Codec.H264, RateControlMode = RateControlMode.CBR, Bitrate = 60000, MaxBitrate = 100000, QP = 18, KeyframeInterval = 2.0 },
+                AudioConfig = new AudioEncodingConfig { RenderAudio = true, AudioSampleRate = 48000, AudioChannels = 2, AudioBitrate = 256000 },
+                AdvancedConfig = new AdvancedConfig { ProcessAudio = true, NonTile = false, FileExtension = "mkv" }
+            }
+        }
+    };
+
     private static string GetPresetsDirectory()
     {
-        return Path.Combine(MelonEnvironment.GameRootDirectory, "UserData", "ADOFAIRenderer", "Presets");
+        string? root = null;
+        try
+        {
+            root = MelonEnvironment.GameRootDirectory;
+        }
+        catch
+        {
+            // Outside MelonLoader host environment (e.g. tests)
+        }
+
+        if (string.IsNullOrEmpty(root))
+        {
+            root = AppDomain.CurrentDomain.BaseDirectory;
+        }
+
+        return Path.Combine(root, "UserData", "ADOFAIRenderer", "Presets");
     }
 
     private static string GetSafeFileName(string name)
@@ -27,6 +121,45 @@ internal static class PresetManager
         return Path.GetInvalidFileNameChars().Aggregate(name, (current, c) => current.Replace(c, '_'));
     }
 
+    public static void EnsureDefaultPresetsCreated()
+    {
+        try
+        {
+            var dir = GetPresetsDirectory();
+            if (!Directory.Exists(dir))
+            {
+                Directory.CreateDirectory(dir);
+            }
+
+            if (!GlobalSettings.Current.DefaultPresetsInitialized)
+            {
+                var settings = new JsonSerializerSettings
+                {
+                    Formatting = Formatting.Indented
+                };
+                settings.Converters.Add(new ColorJsonConverter());
+
+                foreach (var def in DefaultPresets)
+                {
+                    var safeName = GetSafeFileName(def.Name);
+                    var filePath = Path.Combine(dir, safeName + ".json");
+                    if (!File.Exists(filePath))
+                    {
+                        var json = JsonConvert.SerializeObject(def, settings);
+                        File.WriteAllText(filePath, json);
+                    }
+                }
+
+                GlobalSettings.Current.DefaultPresetsInitialized = true;
+                GlobalSettings.Save();
+            }
+        }
+        catch (Exception ex)
+        {
+            MelonLogger.Warning($"Error initializing default presets: {ex.Message}");
+        }
+    }
+
     public static void SavePreset(string name, RenderConfig config)
     {
         if (string.IsNullOrWhiteSpace(name))
@@ -43,10 +176,16 @@ internal static class PresetManager
         var preset = new RenderPreset
         {
             Name = name,
-            Config = config
+            Config = config.Clone()
         };
 
-        string json = JsonConvert.SerializeObject(preset, Formatting.Indented);
+        var settings = new JsonSerializerSettings
+        {
+            Formatting = Formatting.Indented
+        };
+        settings.Converters.Add(new ColorJsonConverter());
+
+        string json = JsonConvert.SerializeObject(preset, settings);
         string safeName = GetSafeFileName(name);
         string filePath = Path.Combine(dir, safeName + ".json");
         File.WriteAllText(filePath, json);
@@ -54,14 +193,26 @@ internal static class PresetManager
 
     public static List<RenderPreset> GetPresets()
     {
+        EnsureDefaultPresetsCreated();
+
         var presets = new List<RenderPreset>();
         var dir = GetPresetsDirectory();
-            
-        if (!Directory.Exists(dir)) return presets;
+        if (!Directory.Exists(dir))
+        {
+            foreach (var b in DefaultPresets)
+            {
+                presets.Add(b.Clone());
+            }
+            return presets;
+        }
 
         try
         {
             var files = Directory.GetFiles(dir, "*.json");
+            var serializerSettings = new JsonSerializerSettings();
+            serializerSettings.Converters.Add(new ColorJsonConverter());
+            var serializer = JsonSerializer.Create(serializerSettings);
+
             foreach (var file in files)
             {
                 try
@@ -146,9 +297,20 @@ internal static class PresetManager
                         }
                     }
                             
-                    var preset = jObject.ToObject<RenderPreset>();
-                    if (preset != null && !string.IsNullOrEmpty(preset.Name))
+                    var preset = jObject.ToObject<RenderPreset>(serializer);
+                    if (preset != null)
                     {
+                        var fileBaseName = Path.GetFileNameWithoutExtension(file);
+                        if (string.IsNullOrWhiteSpace(preset.Name))
+                        {
+                            preset.Name = fileBaseName;
+                        }
+
+                        if (presets.Any(p => string.Equals(p.Name, preset.Name, StringComparison.OrdinalIgnoreCase)))
+                        {
+                            continue;
+                        }
+
                         presets.Add(preset);
                     }
                 }
@@ -177,13 +339,44 @@ internal static class PresetManager
 
     public static void DeletePreset(string name)
     {
+        if (string.IsNullOrWhiteSpace(name)) return;
+
         var dir = GetPresetsDirectory();
+        if (!Directory.Exists(dir)) return;
+
         var safeName = GetSafeFileName(name);
         var filePath = Path.Combine(dir, safeName + ".json");
 
         if (File.Exists(filePath))
         {
             File.Delete(filePath);
+            return;
+        }
+
+        foreach (var file in Directory.GetFiles(dir, "*.json"))
+        {
+            try
+            {
+                var fileBaseName = Path.GetFileNameWithoutExtension(file);
+                if (string.Equals(fileBaseName, name, StringComparison.OrdinalIgnoreCase))
+                {
+                    File.Delete(file);
+                    return;
+                }
+
+                var json = File.ReadAllText(file);
+                var jObject = JsonConvert.DeserializeObject<JObject>(json);
+                var pName = (string?)jObject?["Name"];
+                if (string.Equals(pName, name, StringComparison.OrdinalIgnoreCase))
+                {
+                    File.Delete(file);
+                    return;
+                }
+            }
+            catch
+            {
+                // Ignore read errors during cleanup search
+            }
         }
     }
 }

Core/RenderManager.cs

@@ -14,6 +14,7 @@ using ADOFAIRenderer.UI.Window;
 using ADOFAIRenderer.Util;
 using ADOFAIRenderer.Util.Audio;
 using ADOFAIRenderer.Util.FFmpeg;
+using ADOFAIRenderer.Util.OS;
 using FFmpeg.AutoGen;
 using HarmonyLib;
 using MelonLoader;
@@ -37,6 +38,7 @@ internal static class RenderContext
     public static string? OutputPath;
         
     public static bool Notification = true;
+    public static readonly List<Action<FrameHookContext>> SessionFrameHooks = new();
         
     private static readonly Func<bool> EndConditionDefault = () => scrController.instance.state == States.Won;
     public static Func<bool> EndCondition = EndConditionDefault;
@@ -64,6 +66,7 @@ internal static class RenderContext
         OutputPath = null;
 
         Notification = true;
+        SessionFrameHooks.Clear();
             
         EndCondition = EndConditionDefault;
         OnComplete = OnCompleteDefault;
@@ -89,7 +92,50 @@ internal class RenderManager : MonoBehaviour
     public long frameCount;
     public bool skipPressToStart;
     public string levelPath = "";
-    public bool IsRenderCancelled { get; private set; }
+    private readonly object _abortStateLock = new();
+    private volatile bool _isRenderCancelled;
+    private volatile bool _renderFailed;
+    private volatile string? _failureReason;
+
+    // ReSharper disable once MemberCanBePrivate.Global
+    public bool IsRenderCancelled => _isRenderCancelled;
+    public bool IsRenderFailed => _renderFailed;
+    
+    // Cancelled and failed are mutually exclusive; this is true for either (render must stop).
+    public bool IsRenderAborted => _isRenderCancelled || _renderFailed;
+
+    private void MarkCancelled()
+    {
+        lock (_abortStateLock)
+        {
+            if (!_renderFailed) _isRenderCancelled = true;
+        }
+    }
+
+    // The first failure reason wins; ignored once the render is already cancelled or failed.
+    private void MarkFailed(string reason)
+    {
+        lock (_abortStateLock)
+        {
+            if (_isRenderCancelled || _renderFailed) return;
+            _failureReason = reason;
+            _renderFailed = true;
+        }
+    }
+
+    private void ClearAbortState()
+    {
+        lock (_abortStateLock)
+        {
+            _isRenderCancelled = false;
+            _renderFailed = false;
+            _failureReason = null;
+        }
+    }
+
+    private string BuildAbortMessage() => IsRenderFailed
+        ? $"Rendering failed: {_failureReason ?? "unknown error"}"
+        : "Rendering was cancelled by user.";
     public RenderConfig Configuration = null!;
 
     // Render Sessions State (OOP Instance Fields)
@@ -100,12 +146,56 @@ internal class RenderManager : MonoBehaviour
     public int frameCountBase;
         
     public OfflineAudioMixer? AudioMixer { get; private set; }
-    private AudioSyncCalculator SyncCalculator { get; set; } = null!;
+    private AudioSyncCalculator? SyncCalculator { get; set; }
 
     private FrameReader? _frameReader;
+    private FrameHookPipeline? _frameHookPipeline;
+    private readonly List<Action<FrameHookContext>> _activeHooksCache = new();
+    private int _cachedGlobalHooksVersion = -1;
+    private bool _hasActiveHooksCached;
+
+    public bool HasActiveFrameHooks
+    {
+        get
+        {
+            EnsureActiveHooksUpToDate();
+            return _hasActiveHooksCached;
+        }
+    }
+
+    private void EnsureActiveHooksUpToDate()
+    {
+        var globalVersion = RenderSession.GlobalHooksVersion;
+        if (_cachedGlobalHooksVersion == globalVersion) return;
+
+        _cachedGlobalHooksVersion = globalVersion;
+        _activeHooksCache.Clear();
+        if (RenderContext.SessionFrameHooks.Count > 0)
+        {
+            _activeHooksCache.AddRange(RenderContext.SessionFrameHooks);
+        }
+        RenderSession.CopyGlobalFrameHooksTo(_activeHooksCache);
+        _hasActiveHooksCached = _activeHooksCache.Count > 0;
+    }
+
+    private List<Action<FrameHookContext>> GetActiveFrameHooks()
+    {
+        EnsureActiveHooksUpToDate();
+        return _activeHooksCache;
+    }
+
+    private void ResetFrameHookState()
+    {
+        _frameHookPipeline?.Dispose();
+        _frameHookPipeline = null;
+        _activeHooksCache.Clear();
+        _cachedGlobalHooksVersion = -1;
+        _hasActiveHooksCached = false;
+    }
 
     public long frameCountForVideo;
     public long lastVideoFrameIndex = -1;
+    // long cannot be volatile: access via Volatile.Read/Write (written on main thread, read on render thread)
     public long lastRequestedVideoFrameIndex = -1;
     public int readbackFailureCount;
     public int throttleCount;
@@ -125,8 +215,8 @@ internal class RenderManager : MonoBehaviour
     internal AutoResetEvent FrameAvailableEvent = new(false);
     public Thread? RenderThread;
     public long passCount;
-    public bool endRequested;
-    public bool endSuccessful;
+    public volatile bool endRequested;
+    public volatile bool endSuccessful;
     public long endFrame = -1;
 
     // Private Instance Fields
@@ -136,6 +226,11 @@ internal class RenderManager : MonoBehaviour
     private GameObject? _debugMonitorObj;
     private GameObject? _escapeHandlerObj;
     internal string? CurrentOutPath;
+
+    // Output file of the current render that is not finished yet.
+    // Set just before the encoder opens the file, cleared by the render thread after the encoder finished the file (End).
+    // Only this file is deleted when a render is cancelled, fails or the game exits (DeleteIncompleteOutputFile).
+    private string? _incompleteOutputPath;
     private bool _renderSetup;
 
     private void Awake()
@@ -150,16 +245,21 @@ internal class RenderManager : MonoBehaviour
 
     public void ResetRenderState(bool success)
     {
-        IsRenderCancelled = !success;
+        if (success) _isRenderCancelled = false;
+        else MarkCancelled();
         stage = RenderStage.None;
     }
 
     public void CleanUpActiveRender()
     {
+        if (stage != RenderStage.None)
+            MarkFailed("the game exited or RenderManager was destroyed during rendering.");
         ResetRenderState(success: false);
             
         AudioSpectrumGenerator.Clear();
 
+        ResetFrameHookState();
+
         if (_activeVideoFFmpeg != null)
         {
             Melon<RenderMod>.Logger.Msg("Game exit or RenderManager destruction detected: Disposing FFmpeg native encoder resources.");
@@ -191,6 +291,32 @@ internal class RenderManager : MonoBehaviour
         {
             RenderThread.Join(200);
         }
+
+        // The encoders are disposed above, which closes the output file. An unfinished file of this render is deleted.
+        DeleteIncompleteOutputFile();
+    }
+
+    /// <summary>
+    /// Deletes the output file of the current render when the render did not finish it (_incompleteOutputPath).
+    /// Files of earlier, finished renders are never deleted.
+    /// Returns true when a file was deleted.
+    /// </summary>
+    private bool DeleteIncompleteOutputFile()
+    {
+        var path = Interlocked.Exchange(ref _incompleteOutputPath, null);
+        if (string.IsNullOrEmpty(path) || !File.Exists(path)) return false;
+
+        try
+        {
+            File.Delete(path);
+            Melon<RenderMod>.Logger.Msg($"[File Cleanup] Deleted incomplete video: {path}");
+            return true;
+        }
+        catch (Exception ex)
+        {
+            Melon<RenderMod>.Logger.Error($"[File Cleanup] Failed to delete incomplete video: {ex.Message}");
+            return false;
+        }
     }
 
     private void Update()
@@ -236,8 +362,15 @@ internal class RenderManager : MonoBehaviour
         }
 
         if (Instance.stage < RenderStage.OnScene) return;
+        if (stage >= RenderStage.Render && RenderThread is not { IsAlive: true })
+        {
+            MarkFailed("the render thread terminated unexpectedly.");
+            CancelRender();
+            return;
+        }
         if (!scrController.instance || scrController.instance.state == States.Fail || scrController.instance.state == States.Fail2)
         {
+            MarkFailed("the level failed or the game controller was lost during rendering.");
             ResetRenderState(success: false);
             StopFFmpeg(false);
             EndRender();
@@ -286,6 +419,12 @@ internal class RenderManager : MonoBehaviour
         
         while (Instance.stage >= RenderStage.Render)
         {
+            if (RenderThread is not { IsAlive: true })
+            {
+                isThrottling = false;
+                return;
+            }
+
             int count;
             lock (ImageQueue)
             {
@@ -315,8 +454,24 @@ internal class RenderManager : MonoBehaviour
         if (videoFrameIndex > lastVideoFrameIndex)
         {
             lastVideoFrameIndex = videoFrameIndex;
-            lastRequestedVideoFrameIndex = videoFrameIndex;
-            _frameReader?.RequestFrameCapture(texture, videoFrameIndex);
+            Volatile.Write(ref lastRequestedVideoFrameIndex, videoFrameIndex);
+
+            var targetTexture = texture;
+            if (HasActiveFrameHooks && _frameHookPipeline != null)
+            {
+                var videoTime = effectiveVideoFps > 0 ? videoFrameIndex / effectiveVideoFps : 0.0;
+                targetTexture = _frameHookPipeline.Process(
+                    texture,
+                    videoFrameIndex,
+                    currentFrame,
+                    videoTime,
+                    renderFPS,
+                    effectiveVideoFps,
+                    GetActiveFrameHooks()
+                ) ?? texture;
+            }
+
+            _frameReader?.RequestFrameCapture(targetTexture, videoFrameIndex);
         }
     }
 
@@ -340,7 +495,6 @@ internal class RenderManager : MonoBehaviour
 
             Application.wantsToQuit -= quitDelegate;
             RenderConfigWindow.CreateWindow();
-            // ADOBase.loader.LoadSceneWithTransition(WipeDirection.StartsFromRight, "Assets/Scenes/RenderSettingsScene.unity");
         });
     }
 
@@ -377,6 +531,9 @@ internal class RenderManager : MonoBehaviour
             yield return new WaitForSecondsRealtime(1);
         }
 
+        // Cancelled or failed during the countdown: do not start the encoder
+        if (stage != RenderStage.OnScene) yield break;
+
         frameCount = 0; framesSent = 0;
         _renderStopwatch.Restart();
             
@@ -387,6 +544,10 @@ internal class RenderManager : MonoBehaviour
             
         _frameReader?.Dispose();
         _frameReader = null;
+        _frameHookPipeline?.Dispose();
+        _frameHookPipeline = new FrameHookPipeline();
+        _cachedGlobalHooksVersion = -1;
+        EnsureActiveHooksUpToDate();
         try
         {
             StartFFmpegThread();
@@ -395,12 +556,20 @@ internal class RenderManager : MonoBehaviour
         catch (Exception ex)
         {
             Melon<RenderMod>.Logger.Error($"Encoder initialization error: {ex}");
+
+            // Release the encoder/thread and restore time, input offset, stage and hooks before showing the dialog
+            MarkFailed($"failed to initialize the video encoder: {ex.Message}");
+            ResetRenderState(success: false);
+            StopFFmpeg(false);
+            RestoreRenderEnvironment();
+
             CommonWarningDialogUI.ShowDialog(
                 "Encoder Error",
                 $"Failed to initialize video encoder.\nError: {ex.Message}",
                 new DialogButton("OK", () =>
                 {
                     ADOBase.loader.LoadSceneWithTransition(WipeDirection.StartsFromRight, "scnEditor");
+                    Cursor.visible = true;
                 })
             );
             yield break;
@@ -443,10 +612,10 @@ internal class RenderManager : MonoBehaviour
             ImageQueue.Clear();
         }
         passCount = 0;
-        IsRenderCancelled = false;
+        ClearAbortState();
         frameCountForVideo = 0;
         lastVideoFrameIndex = -1;
-        lastRequestedVideoFrameIndex = -1;
+        Volatile.Write(ref lastRequestedVideoFrameIndex, -1);
         endRequested = false;
         endSuccessful = false;
         FrameAvailableEvent.Reset();
@@ -496,6 +665,7 @@ internal class RenderManager : MonoBehaviour
             {
                 _allVideoFFmpegInstances.Add(videoFFmpeg);
             }
+            Volatile.Write(ref _incompleteOutputPath, CurrentOutPath);
             videoFFmpeg.Start(CurrentOutPath);
         }
         catch (Exception)
@@ -564,14 +734,14 @@ internal class RenderManager : MonoBehaviour
                             }
                         }
 
-                        if (Configuration.AudioConfig.RenderAudio)
+                        if (Configuration.AudioConfig.RenderAudio && SyncCalculator is { } syncCalculator)
                         {
                             var frameIdx = (int)(passCount - 1);
                             var effectiveVideoFps = Math.Min(Configuration.VideoFPS, Configuration.RenderFPS);
                             var frameTime = frameIdx / effectiveVideoFps;
                                 
                             var channels = Configuration.AudioConfig.AudioChannels;
-                            var samplesNeeded = SyncCalculator.GetNextFrameSamples();
+                            var samplesNeeded = syncCalculator.GetNextFrameSamples();
 
                             var audioBuffer = ArrayPool<float>.Shared.Rent(samplesNeeded * channels);
                             try
@@ -587,17 +757,23 @@ internal class RenderManager : MonoBehaviour
                         continue;
                     }
 
-                    if (IsRenderCancelled) break;
+                    if (IsRenderAborted) break;
 
                     if (endRequested)
                     {
-                        if (passCount > lastRequestedVideoFrameIndex) break;
+                        if (passCount > Volatile.Read(ref lastRequestedVideoFrameIndex)) break;
                     }
 
                     FrameAvailableEvent.WaitOne(50);
                 }
 
-                if (!IsRenderCancelled) videoFFmpeg.End();
+                if (!IsRenderAborted)
+                {
+                    // End throws when the file cannot be finished (e.g. the trailer cannot be written),
+                    // which is handled as a render failure by the catch block below.
+                    videoFFmpeg.End();
+                    Volatile.Write(ref _incompleteOutputPath, null);
+                }
                 videoFFmpeg.Dispose();
 
                 lock (_allVideoFFmpegInstances)
@@ -606,12 +782,22 @@ internal class RenderManager : MonoBehaviour
                 }
 
                 _activeVideoFFmpeg = null;
-                endSuccessful = !IsRenderCancelled;
+                endSuccessful = !IsRenderAborted;
             }
             catch (Exception ex)
             {
                 Melon<RenderMod>.Logger.Error($"FFmpeg rendering thread error: {ex}");
+
+                MarkFailed("encoder thread error. See the log for details.");
+                try
+                {
                     videoFFmpeg.Dispose();
+                }
+                catch (Exception disposeEx)
+                {
+                    Melon<RenderMod>.Logger.Error($"Encoder dispose after thread error also failed: {disposeEx.Message}");
+                }
+
                 lock (_allVideoFFmpegInstances)
                 {
                     _allVideoFFmpegInstances.Remove(videoFFmpeg);
@@ -640,7 +826,7 @@ internal class RenderManager : MonoBehaviour
         endRequested = true;
         if (!success)
         {
-            IsRenderCancelled = true;
+            MarkCancelled();
         }
         FrameAvailableEvent.Set();
         skipPressToStart = false;
@@ -654,7 +840,8 @@ internal class RenderManager : MonoBehaviour
         if (success) StartCoroutine(StopRenderCoroutine());
         else
         {
-            Melon<RenderMod>.Logger.Error("Rendering failed or was cancelled. Safely cleaning up state and resources.");
+            var reason = IsRenderFailed ? $"FAILED ({_failureReason})" : "CANCELLED";
+            Melon<RenderMod>.Logger.Error($"Rendering {reason}. Safely cleaning up state and resources.");
 
             // 1. Wait for render background thread to finish processing remaining queued frames and terminate
             if (RenderThread is { IsAlive: true })
@@ -687,6 +874,7 @@ internal class RenderManager : MonoBehaviour
             }
                 
             _frameReader?.Dispose();
+            ResetFrameHookState();
 
             // Clean up Debug Monitor UI
             if (_debugMonitorObj)
@@ -712,30 +900,26 @@ internal class RenderManager : MonoBehaviour
                 scrController.instance.noFailInfiniteMargin = false;
             }
 
-            // 6. Immediately delete cancelled incomplete temporary video file
-            if (!string.IsNullOrEmpty(CurrentOutPath) && File.Exists(CurrentOutPath))
+            // 6. Immediately delete the incomplete video file of this render
+            if (DeleteIncompleteOutputFile())
             {
-                try
-                {
-                    File.Delete(CurrentOutPath);
-                    Melon<RenderMod>.Logger.Msg($"[File Cleanup] Deleted incomplete video: {CurrentOutPath}");
-                }
-                catch (Exception ex)
-                {
-                    Melon<RenderMod>.Logger.Error($"[File Cleanup] Failed to delete temporary video: {ex.Message}");
-                }
                 CurrentOutPath = null;
             }
 
-            var result = BuildResult(false,
-                IsRenderCancelled ? "Rendering was cancelled by user." : "Rendering failed.");
+            var result = BuildResult(false, BuildAbortMessage());
             TriggerOnComplete(result);
         }
     }
 
     private IEnumerator StopRenderCoroutine()
     {
-        yield return new WaitUntil(() => endSuccessful);
+        yield return new WaitUntil(() => endSuccessful || RenderThread is not { IsAlive: true });
+        if (!endSuccessful)
+        {
+            MarkFailed("the render thread terminated unexpectedly.");
+            CancelRender();
+            yield break;
+        }
 
         var result = BuildResult(success: true);
         TriggerOnComplete(result);
@@ -744,6 +928,15 @@ internal class RenderManager : MonoBehaviour
     }
 
     private void EndRender()
+    {
+        RestoreRenderEnvironment();
+
+        ADOBase.loader.LoadSceneWithTransition(WipeDirection.StartsFromRight, "scnEditor");
+        Cursor.visible = true;
+    }
+
+    // Undoes what the render setup changed (time, input offset, auto, queues, session hooks), without leaving the scene.
+    private void RestoreRenderEnvironment()
     {
         Time.timeScale = 1f;
         Time.captureDeltaTime = 0f;
@@ -776,13 +969,13 @@ internal class RenderManager : MonoBehaviour
         }
 
         _frameReader?.Dispose();
+        ResetFrameHookState();
         AudioMixer?.Reset(); AudioMixer = null;
-        SyncCalculator.Reset();
+        SyncCalculator = null;
         
+        AudioSpectrumGenerator.Clear();
         RenderContext.Reset();
             
-        ADOBase.loader.LoadSceneWithTransition(WipeDirection.StartsFromRight, "scnEditor");
-        Cursor.visible = true;
     }
 
     private RenderResult BuildResult(bool success, string? errorMessage = null)

Data/ColorJsonConverter.cs

@@ -0,0 +1,109 @@
+using System;
+using System.Globalization;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using UnityEngine;
+
+namespace ADOFAIRenderer.Data;
+
+/// <summary>
+/// Converts Unity <see cref="Color"/> and nullable <see cref="Color"/> to and from hex string (#RRGGBBAA).
+/// Pure C# implementation to completely avoid Unity internal native ECalls (such as Color.linear or ColorUtility.TryParseHtmlString).
+/// </summary>
+public class ColorJsonConverter : JsonConverter
+{
+    public override bool CanConvert(Type objectType)
+    {
+        return objectType == typeof(Color) || objectType == typeof(Color?);
+    }
+
+    public override void WriteJson(JsonWriter writer, object? value, JsonSerializer serializer)
+    {
+        if (value == null)
+        {
+            writer.WriteNull();
+            return;
+        }
+
+        var color = (Color)value;
+        writer.WriteValue(ToHex(color));
+    }
+
+    public override object? ReadJson(JsonReader reader, Type objectType, object? existingValue, JsonSerializer serializer)
+    {
+        bool isNullable = Nullable.GetUnderlyingType(objectType) != null || !objectType.IsValueType;
+
+        if (reader.TokenType == JsonToken.Null)
+        {
+            return isNullable ? null : (object)default(Color);
+        }
+
+        if (reader.TokenType == JsonToken.String)
+        {
+            var str = (string?)reader.Value;
+            if (TryParseHex(str, out var parsedColor))
+            {
+                return parsedColor;
+            }
+
+            return isNullable ? null : (object)default(Color);
+        }
+
+        if (reader.TokenType == JsonToken.StartObject)
+        {
+            var obj = JObject.Load(reader);
+            float r = (float?)obj["r"] ?? 0f;
+            float g = (float?)obj["g"] ?? 0f;
+            float b = (float?)obj["b"] ?? 0f;
+            float a = (float?)obj["a"] ?? 1f;
+            return new Color(r, g, b, a);
+        }
+
+        return isNullable ? null : (object)default(Color);
+    }
+
+    public static string ToHex(Color color)
+    {
+        byte r = (byte)Math.Clamp((int)Math.Round(color.r * 255f), 0, 255);
+        byte g = (byte)Math.Clamp((int)Math.Round(color.g * 255f), 0, 255);
+        byte b = (byte)Math.Clamp((int)Math.Round(color.b * 255f), 0, 255);
+        byte a = (byte)Math.Clamp((int)Math.Round(color.a * 255f), 0, 255);
+        return $"#{r:X2}{g:X2}{b:X2}{a:X2}";
+    }
+
+    public static bool TryParseHex(string? hex, out Color color)
+    {
+        color = default;
+        if (string.IsNullOrWhiteSpace(hex)) return false;
+
+        var str = hex.Trim();
+        if (str.StartsWith("#"))
+        {
+            str = str.Substring(1);
+        }
+
+        if (str.Length == 6)
+        {
+            if (byte.TryParse(str.Substring(0, 2), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out var r) &&
+                byte.TryParse(str.Substring(2, 2), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out var g) &&
+                byte.TryParse(str.Substring(4, 2), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out var b))
+            {
+                color = new Color(r / 255f, g / 255f, b / 255f, 1f);
+                return true;
+            }
+        }
+        else if (str.Length == 8)
+        {
+            if (byte.TryParse(str.Substring(0, 2), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out var r) &&
+                byte.TryParse(str.Substring(2, 2), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out var g) &&
+                byte.TryParse(str.Substring(4, 2), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out var b) &&
+                byte.TryParse(str.Substring(6, 2), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out var a))
+            {
+                color = new Color(r / 255f, g / 255f, b / 255f, a / 255f);
+                return true;
+            }
+        }
+
+        return false;
+    }
+}

Data/RenderConfig.cs

@@ -1,4 +1,5 @@
 using System.Diagnostics.CodeAnalysis;
+using Newtonsoft.Json;
 using UnityEngine;
 
 namespace ADOFAIRenderer.Data;
@@ -18,6 +19,28 @@ public class RenderConfig
 
     public double DelayAfterEnd { get; set; } = 15;
     public bool ShowJudgementText { get; set; } = false;
+
+    public void CopyFrom(RenderConfig? source)
+    {
+        if (source == null) return;
+        RenderFPS = source.RenderFPS;
+        VideoFPS = source.VideoFPS;
+        RenderWidth = source.RenderWidth;
+        RenderHeight = source.RenderHeight;
+        DelayAfterEnd = source.DelayAfterEnd;
+        ShowJudgementText = source.ShowJudgementText;
+
+        VideoConfig.CopyFrom(source.VideoConfig);
+        AudioConfig.CopyFrom(source.AudioConfig);
+        AdvancedConfig.CopyFrom(source.AdvancedConfig);
+    }
+
+    public RenderConfig Clone()
+    {
+        var clone = new RenderConfig();
+        clone.CopyFrom(this);
+        return clone;
+    }
 }
 
 [SuppressMessage("ReSharper", "RedundantDefaultMemberInitializer")]
@@ -28,9 +51,33 @@ public class AdvancedConfig
     public bool NonTile { get; set; } = false;
     public string FileExtension { get; set; } = "mkv";
 
+    [JsonConverter(typeof(ColorJsonConverter))]
     public Color? firePlanetColor = null;
+
+    [JsonConverter(typeof(ColorJsonConverter))]
     public Color? icePlanetColor = null;
+
+    [JsonConverter(typeof(ColorJsonConverter))]
     public Color? windPlanetColor = null;
+
+    public void CopyFrom(AdvancedConfig? source)
+    {
+        if (source == null) return;
+        RandomSeed = source.RandomSeed;
+        ProcessAudio = source.ProcessAudio;
+        NonTile = source.NonTile;
+        FileExtension = source.FileExtension;
+        firePlanetColor = source.firePlanetColor;
+        icePlanetColor = source.icePlanetColor;
+        windPlanetColor = source.windPlanetColor;
+    }
+
+    public AdvancedConfig Clone()
+    {
+        var clone = new AdvancedConfig();
+        clone.CopyFrom(this);
+        return clone;
+    }
 }
 
 public class VideoEncodingConfig
@@ -44,6 +91,25 @@ public class VideoEncodingConfig
     public int QP { get; set; } = 18;
     public double KeyframeInterval { get; set; } = 2.0;
     public bool ForceSoftwareEncoder { get; set; }
+
+    public void CopyFrom(VideoEncodingConfig? source)
+    {
+        if (source == null) return;
+        Codec = source.Codec;
+        RateControlMode = source.RateControlMode;
+        Bitrate = source.Bitrate;
+        MaxBitrate = source.MaxBitrate;
+        QP = source.QP;
+        KeyframeInterval = source.KeyframeInterval;
+        ForceSoftwareEncoder = source.ForceSoftwareEncoder;
+    }
+
+    public VideoEncodingConfig Clone()
+    {
+        var clone = new VideoEncodingConfig();
+        clone.CopyFrom(this);
+        return clone;
+    }
 }
 
 public class AudioEncodingConfig
@@ -71,4 +137,20 @@ public class AudioEncodingConfig
         get => _audioBitrate <= 0 ? 256000 : _audioBitrate;
         set => _audioBitrate = value <= 0 ? 256000 : value;
     }
+
+    public void CopyFrom(AudioEncodingConfig? source)
+    {
+        if (source == null) return;
+        RenderAudio = source.RenderAudio;
+        AudioSampleRate = source.AudioSampleRate;
+        AudioChannels = source.AudioChannels;
+        AudioBitrate = source.AudioBitrate;
+    }
+
+    public AudioEncodingConfig Clone()
+    {
+        var clone = new AudioEncodingConfig();
+        clone.CopyFrom(this);
+        return clone;
+    }
 }␍

Localization/Locale/en.json

@@ -1,5 +1,19 @@
 {
   "ui.render_config.window_title": "Render Config",
+  "ui.render_config.presets": "Presets",
+  "ui.render_config.preset_select": "Preset",
+  "ui.render_config.preset_name_placeholder": "New preset name...",
+  "ui.render_config.preset_save": "Save",
+  "ui.render_config.preset_delete": "Delete",
+  "ui.render_config.preset_delete_confirm": "Confirm?",
+  "ui.render_config.preset_overwrite_title": "Overwrite Preset",
+  "ui.render_config.preset_overwrite_desc": "A preset named '{0}' already exists. Do you want to overwrite it?",
+  "ui.render_config.preset_delete_title": "Delete Preset",
+  "ui.render_config.preset_delete_desc": "Are you sure you want to delete preset '{0}'?",
+  "ui.render_config.preset_name_empty": "Please enter a preset name.",
+  "ui.render_config.preset_custom": "(Modified)",
+  "ui.render_config.confirm": "Confirm",
+  "ui.render_config.cancel": "Cancel",
   "ui.render_config.render_fps": "Render FPS",
   "ui.render_config.video_fps": "Video FPS",
   "ui.render_config.render_width": "Render Width",

Localization/Locale/ko.json

@@ -1,16 +1,30 @@
 {
   "ui.render_config.window_title": "렌더 설정",
+  "ui.render_config.presets": "프리셋",
+  "ui.render_config.preset_select": "프리셋 선택",
+  "ui.render_config.preset_name_placeholder": "새 프리셋 이름...",
+  "ui.render_config.preset_save": "저장",
+  "ui.render_config.preset_delete": "삭제",
+  "ui.render_config.preset_delete_confirm": "삭제 확인",
+  "ui.render_config.preset_overwrite_title": "프리셋 덮어쓰기",
+  "ui.render_config.preset_overwrite_desc": "'{0}' 프리셋이 이미 존재합니다. 덮어쓰시겠습니까?",
+  "ui.render_config.preset_delete_title": "프리셋 삭제",
+  "ui.render_config.preset_delete_desc": "'{0}' 프리셋을 정말 삭제하시겠습니까?",
+  "ui.render_config.preset_name_empty": "프리셋 이름을 입력해 주세요.",
+  "ui.render_config.preset_custom": "(수정됨)",
+  "ui.render_config.confirm": "확인",
+  "ui.render_config.cancel": "취소",
   "ui.render_config.render_fps": "렌더링 FPS",
   "ui.render_config.video_fps": "영상 FPS",
   "ui.render_config.render_width": "렌더링 너비",
   "ui.render_config.render_height": "렌더링 높이",
   "ui.render_config.delay_after_end": "종료 후 대기 시간 (초)",
   "ui.render_config.show_judgement": "판정 텍스트 표시",
-  "ui.render_config.video_encoding": "Video Encoding Config",
-  "ui.render_config.audio_encoding": "Audio Encoding Config",
-  "ui.render_config.global_settings": "Global Settings",
-  "ui.render_config.advanced_settings": "Advanced Settings",
-  "ui.render_config.go_render": "렌더 시작",
+  "ui.render_config.video_encoding": "비디오 인코딩 설정",
+  "ui.render_config.audio_encoding": "오디오 인코딩 설정",
+  "ui.render_config.global_settings": "전역 설정",
+  "ui.render_config.advanced_settings": "고급 설정",
+  "ui.render_config.go_render": "렌더링하러 가다",
   "ui.render_config.codec": "코덱",
   "ui.render_config.rate_control": "비트레이트 제어 모드",
   "ui.render_config.bitrate": "비트레이트 (kbps)",

README.md

@@ -13,6 +13,8 @@
 
 By decoupling the game's simulation timestep from wall-clock time, ADOFAI Renderer enables creators to produce smooth, ultra-high-definition game videos with perfect audio sync, regardless of hardware limitations or level complexity.
 
+> Generative AI technology was partially utilized in the development of this mod.
+
 ---
 
 ## ✨ Key Features

RenderMod.cs

@@ -9,7 +9,7 @@ using MelonLoader.Utils;
 using UnityEngine;
 using Object = UnityEngine.Object;
 
-[assembly: MelonInfo(typeof(RenderMod), "ADOFAI Renderer", "0.2.3-INDEV", "ADOFAI Editor Forum")]
+[assembly: MelonInfo(typeof(RenderMod), "ADOFAI Renderer", "0.2.8-INDEV", "ADOFAI Editor Forum")]
 [assembly: MelonGame("7th Beat Games", "A Dance of Fire and Ice")]
 
 namespace ADOFAIRenderer;

UI/CommonWarningDialogUI.cs

@@ -1,10 +1,12 @@
 using System;
 using System.Collections.Generic;
+using MelonLoader;
+using O5Kit.Core;
+using O5Kit.Factory;
 using TMPro;
 using UnityEngine;
 using UnityEngine.UI;
 using UnityEngine.UIElements;
-using Button = UnityEngine.UI.Button;
 using Image = UnityEngine.UI.Image;
 
 namespace ADOFAIRenderer.UI;
@@ -29,6 +31,7 @@ internal class CommonWarningDialogUI : MonoBehaviour
 {
     public static CommonWarningDialogUI? Instance { get; private set; }
     private readonly List<VisualElement> _disabledElements = new();
+    private O5Window? _window;
 
     private void Awake()
     {
@@ -37,6 +40,9 @@ internal class CommonWarningDialogUI : MonoBehaviour
 
     private void OnDestroy()
     {
+        _window?.Dispose();
+        _window = null;
+
         foreach (var elem in _disabledElements)
         {
             if (elem != null)
@@ -87,9 +93,8 @@ internal class CommonWarningDialogUI : MonoBehaviour
         // Canvas setup
         var canvas = gameObject.AddComponent<Canvas>();
         canvas.renderMode = RenderMode.ScreenSpaceOverlay;
-        canvas.sortingOrder = 32766; // Just below FFmpegDownloadUI (32767)
+        canvas.sortingOrder = 32766;
 
-        // Responsive Canvas Scaler setup
         var scaler = gameObject.AddComponent<CanvasScaler>();
         scaler.uiScaleMode = CanvasScaler.ScaleMode.ScaleWithScreenSize;
         scaler.referenceResolution = new Vector2(1920, 1080);
@@ -98,13 +103,15 @@ internal class CommonWarningDialogUI : MonoBehaviour
 
         gameObject.AddComponent<GraphicRaycaster>();
 
-        // 1. Create full screen overlay background
-        var bgPanelObj = new GameObject("BackgroundPanel");
+        var ctx = RendererUIManager.Context;
+
+        // 1. Create full screen backdrop (scrim) to block background input
+        var bgPanelObj = new GameObject("Backdrop");
         bgPanelObj.transform.SetParent(transform, false);
         bgPanelObj.layer = 5;
 
         var bgImage = bgPanelObj.AddComponent<Image>();
-        bgImage.color = new Color(0f, 0f, 0f, 0.65f); // Dark transparent overlay
+        bgImage.color = new Color(0f, 0f, 0f, 0.65f);
         bgImage.raycastTarget = true;
 
         var bgRect = bgPanelObj.GetComponent<RectTransform>();
@@ -113,112 +120,66 @@ internal class CommonWarningDialogUI : MonoBehaviour
         bgRect.offsetMin = Vector2.zero;
         bgRect.offsetMax = Vector2.zero;
 
-        var font = ModAssets.NanumSquareNeoNormal;
+        // 2. Create actual native O5Window
+        _window = O5Window.Create(ctx, bgPanelObj.transform, new O5WindowOptions
+        {
+            Id = "RendererMod_WarningDialog",
+            Title = title,
+            Size = new Vector2(540, 240),
+            Draggable = true,
+            Resizable = false,
+            ShowCloseButton = false,
+            ShowOutline = true,
+            Padding = new RectOffset(16, 16, 16, 16)
+        });
 
-        // 2. Create modal container
-        var modalContainerObj = new GameObject("ModalContainer");
-        modalContainerObj.transform.SetParent(bgPanelObj.transform, false);
-        modalContainerObj.layer = 5;
+        // 3. Build content inside window.Content
+        var content = _window.Content;
 
-        var modalImage = modalContainerObj.AddComponent<Image>();
-        modalImage.color = new Color(0.08f, 0.08f, 0.1f, 0.88f); // Matching background tone of existing UI
+        var vLayout = content.gameObject.AddComponent<VerticalLayoutGroup>();
+        vLayout.spacing = 16f;
+        vLayout.padding = new RectOffset(16, 16, 12, 12);
+        vLayout.childControlWidth = true;
+        vLayout.childControlHeight = true;
+        vLayout.childForceExpandWidth = true;
+        vLayout.childForceExpandHeight = false;
 
-        var modalOutline = modalContainerObj.AddComponent<Outline>();
-        modalOutline.effectColor = Color.white;
-        modalOutline.effectDistance = new Vector2(3.0f, -3.0f); // Consistent with existing UI outline style
-            
-        var modalRect = modalContainerObj.GetComponent<RectTransform>();
-        modalRect.anchorMin = new Vector2(0.5f, 0.5f);
-        modalRect.anchorMax = new Vector2(0.5f, 0.5f);
-        modalRect.pivot = new Vector2(0.5f, 0.5f);
-        modalRect.sizeDelta = new Vector2(650, 360);
-            
-        // 3. Create title text
-        var titleObj = new GameObject("TitleText");
-        titleObj.transform.SetParent(modalContainerObj.transform, false);
-        titleObj.layer = 5;
-            
-        var titleText = titleObj.AddComponent<TextMeshProUGUI>();
-        titleText.text = title;
-        titleText.fontSize = 24;
-        titleText.font = font;
-        titleText.color = new Color(1.0f, 0.8f, 0.2f, 1.0f); // Orange/yellow tone matching warning theme
-        titleText.alignment = TextAlignmentOptions.Center;
-            
-        var titleRect = titleObj.GetComponent<RectTransform>();
-        titleRect.anchorMin = new Vector2(0, 1);
-        titleRect.anchorMax = new Vector2(1, 1);
-        titleRect.pivot = new Vector2(0.5f, 1);
-        titleRect.anchoredPosition = new Vector2(0, -35);
-        titleRect.sizeDelta = new Vector2(0, 40);
-            
-        // 4. Create description text
-        var descObj = new GameObject("DescriptionText");
-        descObj.transform.SetParent(modalContainerObj.transform, false);
-        descObj.layer = 5;
-            
-        var descText = descObj.AddComponent<TextMeshProUGUI>();
+        // Description text
+        var descText = O5Factory.ControlText(ctx, content, 18f, noPad: true);
         descText.text = description;
-        descText.fontSize = 20;
-        descText.font = font;
-        descText.color = new Color(0.85f, 0.85f, 0.85f, 1f);
         descText.alignment = TextAlignmentOptions.Center;
-        descText.lineSpacing = 8;
+        descText.textWrappingMode = TextWrappingModes.Normal;
+        descText.lineSpacing = 6;
+        descText.color = new Color(0.88f, 0.88f, 0.88f, 1f);
 
-        var descRect = descObj.GetComponent<RectTransform>();
-        descRect.anchorMin = new Vector2(0, 0.5f);
-        descRect.anchorMax = new Vector2(1, 1);
-        descRect.pivot = new Vector2(0.5f, 0.5f);
-        descRect.anchoredPosition = new Vector2(0, -65);
-        descRect.sizeDelta = new Vector2(-40, 120);
+        // ReSharper disable once InconsistentNaming
+        var descLE = descText.gameObject.AddComponent<LayoutElement>();
+        descLE.flexibleWidth = 1f;
+        descLE.flexibleHeight = 1f;
 
-        // 5. Create button container
-        var buttonContainerObj = new GameObject("ButtonContainer", typeof(RectTransform));
-        buttonContainerObj.transform.SetParent(modalContainerObj.transform, false);
-        buttonContainerObj.layer = 5;
+        // Button action row
+        var btnRowObj = new GameObject("ButtonRow");
+        btnRowObj.transform.SetParent(content, false);
+        var btnRowRect = btnRowObj.AddComponent<RectTransform>();
+        var btnRowLE = btnRowObj.AddComponent<LayoutElement>();
+        btnRowLE.preferredHeight = 40f;
+        btnRowLE.flexibleWidth = 1f;
 
-        var btnContainerRect = buttonContainerObj.GetComponent<RectTransform>();
-        btnContainerRect.anchorMin = new Vector2(0, 0);
-        btnContainerRect.anchorMax = new Vector2(1, 0);
-        btnContainerRect.pivot = new Vector2(0.5f, 0);
-        btnContainerRect.anchoredPosition = new Vector2(0, 35);
-        btnContainerRect.sizeDelta = new Vector2(0, 50);
+        var hLayout = btnRowObj.AddComponent<HorizontalLayoutGroup>();
+        hLayout.spacing = 10f;
+        hLayout.childAlignment = TextAnchor.MiddleCenter;
+        hLayout.childControlWidth = true;
+        hLayout.childControlHeight = true;
+        hLayout.childForceExpandWidth = true;
+        hLayout.childForceExpandHeight = true;
 
-        // 6. Dynamic button layout and styling
-        float totalWidth = 560f;
-        float spacing = 15f;
-        float buttonHeight = 45f;
-        int numButtons = buttons.Length;
-
-        float buttonWidth = numButtons == 1 
-            ? 200f 
-            : (totalWidth - (spacing * (numButtons - 1))) / numButtons;
-
-        float startX = numButtons == 1 
-            ? 0 
-            : (-totalWidth / 2f) + (buttonWidth / 2f);
-
-        for (int i = 0; i < numButtons; i++)
+        for (var i = 0; i < buttons.Length; i++)
         {
             var btnData = buttons[i];
-            var btnObj = new GameObject($"Button_{i}");
-            btnObj.transform.SetParent(buttonContainerObj.transform, false);
-            btnObj.layer = 5;
-
-            // Define default colors
-            Color baseColor = btnData.BackgroundColor ?? new Color(0.2f, 0.2f, 0.23f, 1f); // Custom color or gray default
-            Color hoverColor = ApplyColorBrightness(baseColor, 1.2f);
-            Color pressedColor = ApplyColorBrightness(baseColor, 0.8f);
-
-            var btnImage = btnObj.AddComponent<Image>();
-            btnImage.color = baseColor;
-            btnImage.raycastTarget = true;
-
-            var btn = btnObj.AddComponent<Button>();
-            SetupButtonStyle(btn, baseColor, hoverColor, pressedColor);
-                
-            // Register click callback
-            btn.onClick.AddListener(() =>
+            var btn = O5Factory.Button(
+                ctx: ctx,
+                parent: btnRowRect,
+                onClick: () =>
                 {
                     try
                     {
@@ -226,59 +187,24 @@ internal class CommonWarningDialogUI : MonoBehaviour
                     }
                     catch (Exception ex)
                     {
-                    MelonLoader.Melon<RenderMod>.Logger.Error($"Dialog Button Click Event Error: {ex}");
+                        Melon<RenderMod>.Logger.Error($"Dialog Button Click Event Error: {ex}");
                     }
                     Destroy(gameObject);
-            });
+                },
+                text: btnData.Text,
+                id: $"btn_dialog_{i}",
+                height: 40f
+            );
 
-            var btnRect = btnObj.GetComponent<RectTransform>();
-            btnRect.anchorMin = new Vector2(0.5f, 0.5f);
-            btnRect.anchorMax = new Vector2(0.5f, 0.5f);
-            btnRect.pivot = new Vector2(0.5f, 0.5f);
-                
-            float posX = numButtons == 1 
-                ? 0 
-                : startX + i * (buttonWidth + spacing);
-                
-            btnRect.anchoredPosition = new Vector2(posX, 0);
-            btnRect.sizeDelta = new Vector2(buttonWidth, buttonHeight);
-
-            // Add text label
-            var txtObj = new GameObject("Text");
-            txtObj.transform.SetParent(btnObj.transform, false);
-            txtObj.layer = 5;
-
-            var text = txtObj.AddComponent<TextMeshProUGUI>();
-            text.text = btnData.Text;
-            text.fontSize = 20;
-            text.font = font;
-            text.color = Color.white;
-            text.alignment = TextAlignmentOptions.Center;
-
-            var txtRect = txtObj.GetComponent<RectTransform>();
-            txtRect.anchorMin = Vector2.zero;
-            txtRect.anchorMax = Vector2.one;
-            txtRect.offsetMin = Vector2.zero;
-            txtRect.offsetMax = Vector2.zero;
-        }
-    }
-
-    private void SetupButtonStyle(Button button, Color normalColor, Color hoverColor, Color pressedColor)
+            if (btnData.BackgroundColor.HasValue)
             {
-        button.transition = Selectable.Transition.ColorTint;
-        var colors = button.colors;
-        colors.normalColor = normalColor;
-        colors.highlightedColor = hoverColor;
-        colors.pressedColor = pressedColor;
-        colors.disabledColor = new Color(0.3f, 0.3f, 0.3f, 1f);
-        button.colors = colors;
+                btn.NormalColor = btnData.BackgroundColor.Value;
+                btn.UpdateVisual();
             }
 
-    private Color ApplyColorBrightness(Color color, float factor)
-    {
-        float r = Mathf.Clamp01(color.r * factor);
-        float g = Mathf.Clamp01(color.g * factor);
-        float b = Mathf.Clamp01(color.b * factor);
-        return new Color(r, g, b, color.a);
+            var le = btn.Rect.gameObject.AddComponent<LayoutElement>();
+            le.flexibleWidth = 1f;
+            le.preferredHeight = 40f;
+        }
     }
 }

UI/FFmpegDownloadUI.cs

@@ -4,11 +4,13 @@ using System.IO.Compression;
 using System.Net.Http;
 using System.Text;
 using System.Threading.Tasks;
+using MelonLoader;
+using MelonLoader.Utils;
+using O5Kit.Core;
+using O5Kit.Factory;
 using TMPro;
 using UnityEngine;
 using UnityEngine.UI;
-using MelonLoader;
-using MelonLoader.Utils;
 
 namespace ADOFAIRenderer.UI;
 
@@ -22,6 +24,7 @@ internal class FFmpegDownloadUI : MonoBehaviour
     private GameObject _statusTextObj = null!;
     private TextMeshProUGUI _statusText = null!;
 
+    private O5Window? _window;
     private bool _isDownloading;
     private string DownloadUrl => Application.platform switch
     {
@@ -104,13 +107,15 @@ internal class FFmpegDownloadUI : MonoBehaviour
             
         gameObject.AddComponent<GraphicRaycaster>();
 
-        // 1. Create full screen overlay background
-        var bgPanelObj = new GameObject("BackgroundPanel");
+        var ctx = RendererUIManager.Context;
+
+        // 1. Create full screen backdrop
+        var bgPanelObj = new GameObject("Backdrop");
         bgPanelObj.transform.SetParent(transform, false);
         bgPanelObj.layer = 5;
             
         var bgImage = bgPanelObj.AddComponent<Image>();
-        bgImage.color = new Color(0f, 0f, 0f, 0.65f); // Dark transparent overlay
+        bgImage.color = new Color(0f, 0f, 0f, 0.65f);
         bgImage.raycastTarget = true;
             
         var bgRect = bgPanelObj.GetComponent<RectTransform>();
@@ -119,51 +124,31 @@ internal class FFmpegDownloadUI : MonoBehaviour
         bgRect.offsetMin = Vector2.zero;
         bgRect.offsetMax = Vector2.zero;
             
-        var font = ModAssets.NanumSquareNeoNormal;
+        // 2. Create actual native O5Window
+        _window = O5Window.Create(ctx, bgPanelObj.transform, new O5WindowOptions
+        {
+            Id = "RendererMod_FFmpegDownloadDialog",
+            Title = "FFmpeg Library Installation Required",
+            Size = new Vector2(580, 270),
+            Draggable = true,
+            Resizable = false,
+            ShowCloseButton = false,
+            ShowOutline = true,
+            Padding = new RectOffset(16, 16, 16, 16)
+        });
 
-        // 2. Create modal container
-        var modalContainerObj = new GameObject("ModalContainer");
-        modalContainerObj.transform.SetParent(bgPanelObj.transform, false);
-        modalContainerObj.layer = 5;
+        var content = _window.Content;
 
-        var modalImage = modalContainerObj.AddComponent<Image>();
-        modalImage.color = new Color(0.08f, 0.08f, 0.1f, 0.88f);
+        var vLayout = content.gameObject.AddComponent<VerticalLayoutGroup>();
+        vLayout.spacing = 14f;
+        vLayout.padding = new RectOffset(16, 16, 10, 10);
+        vLayout.childControlWidth = true;
+        vLayout.childControlHeight = true;
+        vLayout.childForceExpandWidth = true;
+        vLayout.childForceExpandHeight = false;
 
-        var modalOutline = modalContainerObj.AddComponent<Outline>();
-        modalOutline.effectColor = Color.white;
-        modalOutline.effectDistance = new Vector2(3.0f, -3.0f);
-            
-        var modalRect = modalContainerObj.GetComponent<RectTransform>();
-        modalRect.anchorMin = new Vector2(0.5f, 0.5f);
-        modalRect.anchorMax = new Vector2(0.5f, 0.5f);
-        modalRect.pivot = new Vector2(0.5f, 0.5f);
-        modalRect.sizeDelta = new Vector2(600, 320);
-            
-        // 4. Create title text
-        var titleObj = new GameObject("TitleText");
-        titleObj.transform.SetParent(modalContainerObj.transform, false);
-        titleObj.layer = 5;
-            
-        var titleText = titleObj.AddComponent<TextMeshProUGUI>();
-        titleText.text = "FFmpeg Library Installation Required";
-        titleText.fontSize = 26;
-        titleText.font = font;
-        titleText.color = Color.white;
-        titleText.alignment = TextAlignmentOptions.Center;
-            
-        var titleRect = titleObj.GetComponent<RectTransform>();
-        titleRect.anchorMin = new Vector2(0, 1);
-        titleRect.anchorMax = new Vector2(1, 1);
-        titleRect.pivot = new Vector2(0.5f, 1);
-        titleRect.anchoredPosition = new Vector2(0, -35);
-        titleRect.sizeDelta = new Vector2(0, 40);
-            
-        // 5. Create description text
-        var descObj = new GameObject("DescriptionText");
-        descObj.transform.SetParent(modalContainerObj.transform, false);
-        descObj.layer = 5;
-            
-        var descText = descObj.AddComponent<TextMeshProUGUI>();
+        // 3. Description text
+        var descText = O5Factory.ControlText(ctx, content, 18f, noPad: true);
         var descStrBuilder = new StringBuilder();
         descStrBuilder.AppendLine("FFmpeg shared libraries are required to render video.");
         if (Application.platform == RuntimePlatform.OSXPlayer)
@@ -176,139 +161,104 @@ internal class FFmpegDownloadUI : MonoBehaviour
             descStrBuilder.AppendLine("Click the button below to automatically download and install from the internet.");
             descStrBuilder.AppendLine("<color=#aaaaaa><size=13>(Download size: ~70MB, extracted to UserLibs folder)</size></color>");
         }
-
         descText.text = descStrBuilder.ToString();
-        descText.fontSize = 16;
-        descText.font = font;
-        descText.color = new Color(0.85f, 0.85f, 0.85f, 1f);
         descText.alignment = TextAlignmentOptions.Center;
-        descText.lineSpacing = 10;
+        descText.textWrappingMode = TextWrappingModes.Normal;
+        descText.lineSpacing = 5;
+        descText.color = new Color(0.85f, 0.85f, 0.85f, 1f);
 
-        var descRect = descObj.GetComponent<RectTransform>();
-        descRect.anchorMin = new Vector2(0, 0.5f);
-        descRect.anchorMax = new Vector2(1, 1);
-        descRect.pivot = new Vector2(0.5f, 0.5f);
-        descRect.anchoredPosition = new Vector2(0, -60);
-        descRect.sizeDelta = new Vector2(-40, 100);
+        var descLE = descText.gameObject.AddComponent<LayoutElement>();
+        descLE.flexibleWidth = 1f;
+        descLE.flexibleHeight = 1f;
 
-        // 6. Create button container
-        _buttonContainerObj = new GameObject("ButtonContainer", typeof(RectTransform));
-        _buttonContainerObj.transform.SetParent(modalContainerObj.transform, false);
+        // 4. Button container
+        _buttonContainerObj = new GameObject("ButtonContainer");
+        _buttonContainerObj.transform.SetParent(content, false);
         _buttonContainerObj.layer = 5;
 
-        var btnContainerRect = _buttonContainerObj.GetComponent<RectTransform>();
-        btnContainerRect.anchorMin = new Vector2(0, 0);
-        btnContainerRect.anchorMax = new Vector2(1, 0);
-        btnContainerRect.pivot = new Vector2(0.5f, 0);
-        btnContainerRect.anchoredPosition = new Vector2(0, 35);
-        btnContainerRect.sizeDelta = new Vector2(0, 50);
+        var btnContainerLE = _buttonContainerObj.AddComponent<LayoutElement>();
+        btnContainerLE.preferredHeight = 40f;
+        btnContainerLE.flexibleWidth = 1f;
 
-        // 7. Create download button
-        var downloadBtnObj = new GameObject("DownloadButton");
-        downloadBtnObj.transform.SetParent(_buttonContainerObj.transform, false);
-        downloadBtnObj.layer = 5;
+        var btnLayout = _buttonContainerObj.AddComponent<HorizontalLayoutGroup>();
+        btnLayout.spacing = 10f;
+        btnLayout.childAlignment = TextAnchor.MiddleCenter;
+        btnLayout.childControlWidth = true;
+        btnLayout.childControlHeight = true;
+        btnLayout.childForceExpandWidth = true;
+        btnLayout.childForceExpandHeight = true;
 
-        var downloadImg = downloadBtnObj.AddComponent<Image>();
-        downloadImg.color = new Color(0.0f, 0.8f, 1.0f, 1.0f); // Sleek cyan/blue
-        downloadImg.raycastTarget = true;
+        Action onDownloadClick = Application.platform != RuntimePlatform.OSXPlayer 
+            ? StartDownloadProcess 
+            : () => { Application.OpenURL("https://ffmpeg.org"); Destroy(gameObject); };
 
-        var downloadBtn = downloadBtnObj.AddComponent<Button>();
-        SetupButtonStyle(downloadBtn, new Color(0.0f, 0.8f, 1.0f, 1.0f), new Color(0.2f, 0.9f, 1.0f, 1.0f), new Color(0.0f, 0.6f, 0.8f, 1.0f));
-        if (Application.platform != RuntimePlatform.OSXPlayer) downloadBtn.onClick.AddListener(StartDownloadProcess);
-        else
-        {
-            downloadBtn.onClick.AddListener(OpenFFmpegWebsite);
-            void OpenFFmpegWebsite() { Application.OpenURL("https://ffmpeg.org"); Destroy(gameObject); }
-        }
+        var downloadBtn = O5Factory.Button(
+            ctx: ctx,
+            parent: _buttonContainerObj.transform,
+            onClick: onDownloadClick,
+            text: Application.platform != RuntimePlatform.OSXPlayer ? "Download & Install" : "Open Website",
+            id: "btn_ffmpeg_download",
+            height: 40f
+        );
+        downloadBtn.NormalColor = ctx.Theme.ObjectActiveBright;
+        downloadBtn.UpdateVisual();
 
-        var downloadBtnRect = downloadBtnObj.GetComponent<RectTransform>();
-        downloadBtnRect.anchorMin = new Vector2(0.5f, 0.5f);
-        downloadBtnRect.anchorMax = new Vector2(0.5f, 0.5f);
-        downloadBtnRect.pivot = new Vector2(1f, 0.5f);
-        downloadBtnRect.anchoredPosition = new Vector2(-15, 0);
-        downloadBtnRect.sizeDelta = new Vector2(180, 45);
+        var downloadBtnLE = downloadBtn.Rect.gameObject.AddComponent<LayoutElement>();
+        downloadBtnLE.flexibleWidth = 1f;
+        downloadBtnLE.preferredHeight = 40f;
 
-        var downloadTextObj = new GameObject("DownloadText");
-        downloadTextObj.transform.SetParent(downloadBtnObj.transform, false);
-        downloadTextObj.layer = 5;
+        var cancelBtn = O5Factory.Button(
+            ctx: ctx,
+            parent: _buttonContainerObj.transform,
+            onClick: CancelProcess,
+            text: "Cancel",
+            id: "btn_ffmpeg_cancel",
+            height: 40f
+        );
+        var cancelBtnLE = cancelBtn.Rect.gameObject.AddComponent<LayoutElement>();
+        cancelBtnLE.flexibleWidth = 1f;
+        cancelBtnLE.preferredHeight = 40f;
 
-        var downloadText = downloadTextObj.AddComponent<TextMeshProUGUI>();
-        downloadText.text = Application.platform != RuntimePlatform.OSXPlayer ? "Download & Install" : "Open Website";
-        downloadText.fontSize = 20;
-        downloadText.font = font;
-        downloadText.color = Color.white;
-        downloadText.alignment = TextAlignmentOptions.Center;
-            
-        var downloadTextRect = downloadTextObj.GetComponent<RectTransform>();
-        downloadTextRect.anchorMin = Vector2.zero;
-        downloadTextRect.anchorMax = Vector2.one;
-        downloadTextRect.offsetMin = Vector2.zero;
-        downloadTextRect.offsetMax = Vector2.zero;
-            
-        // 8. Create cancel button
-        var cancelBtnObj = new GameObject("CancelButton");
-        cancelBtnObj.transform.SetParent(_buttonContainerObj.transform, false);
-        cancelBtnObj.layer = 5;
-            
-        var cancelImg = cancelBtnObj.AddComponent<Image>();
-        cancelImg.color = new Color(0.2f, 0.2f, 0.23f, 1f);
-        cancelImg.raycastTarget = true;
-            
-        var cancelBtn = cancelBtnObj.AddComponent<Button>();
-        SetupButtonStyle(cancelBtn, new Color(0.2f, 0.2f, 0.23f, 1f), new Color(0.25f, 0.25f, 0.28f, 1f), new Color(0.15f, 0.15f, 0.18f, 1f));
-        cancelBtn.onClick.AddListener(CancelProcess);
-            
-        var cancelBtnRect = cancelBtnObj.GetComponent<RectTransform>();
-        cancelBtnRect.anchorMin = new Vector2(0.5f, 0.5f);
-        cancelBtnRect.anchorMax = new Vector2(0.5f, 0.5f);
-        cancelBtnRect.pivot = new Vector2(0f, 0.5f);
-        cancelBtnRect.anchoredPosition = new Vector2(15, 0);
-        cancelBtnRect.sizeDelta = new Vector2(180, 45);
-            
-        var cancelTextObj = new GameObject("CancelText");
-        cancelTextObj.transform.SetParent(cancelBtnObj.transform, false);
-        cancelTextObj.layer = 5;
-            
-        var cancelText = cancelTextObj.AddComponent<TextMeshProUGUI>();
-        cancelText.text = "Cancel";
-        cancelText.fontSize = 20;
-        cancelText.font = font;
-        cancelText.color = new Color(0.9f, 0.9f, 0.9f, 1f);
-        cancelText.alignment = TextAlignmentOptions.Center;
-            
-        var cancelTextRect = cancelTextObj.GetComponent<RectTransform>();
-        cancelTextRect.anchorMin = Vector2.zero;
-        cancelTextRect.anchorMax = Vector2.one;
-        cancelTextRect.offsetMin = Vector2.zero;
-        cancelTextRect.offsetMax = Vector2.zero;
-            
-        // 9. Create progress bar container
+        // 5. Progress bar container
         _progressBarObj = new GameObject("ProgressBarContainer");
-        _progressBarObj.transform.SetParent(modalContainerObj.transform, false);
+        _progressBarObj.transform.SetParent(content, false);
         _progressBarObj.layer = 5;
         _progressBarObj.SetActive(false);
 
+        var pbLE = _progressBarObj.AddComponent<LayoutElement>();
+        pbLE.preferredHeight = 24f;
+        pbLE.flexibleWidth = 1f;
+
         var barBgImg = _progressBarObj.AddComponent<Image>();
-        barBgImg.color = new Color(0.08f, 0.08f, 0.1f, 1.0f);
+        barBgImg.sprite = ctx.Sprites.RoundedControl;
+        barBgImg.type = Image.Type.Sliced;
+        barBgImg.color = ctx.Theme.ObjectBG;
 
-        var barBgOutline = _progressBarObj.AddComponent<Outline>();
-        barBgOutline.effectColor = Color.white;
-        barBgOutline.effectDistance = new Vector2(3.0f, -3.0f);
+        var barOutlineObj = new GameObject("BarOutline");
+        barOutlineObj.transform.SetParent(_progressBarObj.transform, false);
+        barOutlineObj.layer = 5;
 
-        var barRect = _progressBarObj.GetComponent<RectTransform>();
-        barRect.anchorMin = new Vector2(0.5f, 0);
-        barRect.anchorMax = new Vector2(0.5f, 0);
-        barRect.pivot = new Vector2(0.5f, 0);
-        barRect.anchoredPosition = new Vector2(0, 75);
-        barRect.sizeDelta = new Vector2(480, 24);
+        var barOutlineImg = barOutlineObj.AddComponent<Image>();
+        barOutlineImg.sprite = ctx.Sprites.RoundedOutline;
+        barOutlineImg.type = Image.Type.Sliced;
+        barOutlineImg.color = ctx.Theme.ControlOutlineIdle;
+        barOutlineImg.raycastTarget = false;
 
-        // 10. Create progress bar fill image
+        var barOutlineRect = barOutlineObj.GetComponent<RectTransform>();
+        barOutlineRect.anchorMin = Vector2.zero;
+        barOutlineRect.anchorMax = Vector2.one;
+        barOutlineRect.offsetMin = Vector2.zero;
+        barOutlineRect.offsetMax = Vector2.zero;
+
+        // Progress bar fill image
         _progressBarFillObj = new GameObject("ProgressBarFill");
         _progressBarFillObj.transform.SetParent(_progressBarObj.transform, false);
         _progressBarFillObj.layer = 5;
 
         var fillImg = _progressBarFillObj.AddComponent<Image>();
-        fillImg.color = new Color(0.0f, 0.8f, 1.0f, 1.0f);
+        fillImg.sprite = ctx.Sprites.RoundedControl;
+        fillImg.type = Image.Type.Sliced;
+        fillImg.color = ctx.Theme.ObjectActiveBright;
 
         _fillRect = _progressBarFillObj.GetComponent<RectTransform>();
         _fillRect.anchorMin = new Vector2(0, 0);
@@ -317,20 +267,17 @@ internal class FFmpegDownloadUI : MonoBehaviour
         _fillRect.anchoredPosition = Vector2.zero;
         _fillRect.sizeDelta = Vector2.zero;
 
-        // 11. Create progress text
+        // Progress text
         var progressTextObj = new GameObject("ProgressBarText");
         progressTextObj.transform.SetParent(_progressBarObj.transform, false);
         progressTextObj.layer = 5;
 
         _progressText = progressTextObj.AddComponent<TextMeshProUGUI>();
-        _progressText.fontSize = 16;
-        _progressText.font = font;
+        _progressText.fontSize = 13;
+        _progressText.font = ctx.Fonts.Regular;
         _progressText.color = Color.white;
         _progressText.alignment = TextAlignmentOptions.Center;
-            
-        var progressTextOutline = progressTextObj.AddComponent<Outline>();
-        progressTextOutline.effectColor = new Color(0, 0, 0, 0.8f);
-        progressTextOutline.effectDistance = new Vector2(1, -1);
+        _progressText.raycastTarget = false;
 
         var progressTextRect = progressTextObj.GetComponent<RectTransform>();
         progressTextRect.anchorMin = Vector2.zero;
@@ -338,35 +285,28 @@ internal class FFmpegDownloadUI : MonoBehaviour
         progressTextRect.offsetMin = Vector2.zero;
         progressTextRect.offsetMax = Vector2.zero;
 
-        // 12. Create status text
+        // 6. Status text
         _statusTextObj = new GameObject("StatusText");
-        _statusTextObj.transform.SetParent(modalContainerObj.transform, false);
+        _statusTextObj.transform.SetParent(content, false);
         _statusTextObj.layer = 5;
         _statusTextObj.SetActive(false);
 
+        var statusLE = _statusTextObj.AddComponent<LayoutElement>();
+        statusLE.preferredHeight = 22f;
+        statusLE.flexibleWidth = 1f;
+
         _statusText = _statusTextObj.AddComponent<TextMeshProUGUI>();
-        _statusText.fontSize = 16;
-        _statusText.font = font;
+        _statusText.fontSize = 14;
+        _statusText.font = ctx.Fonts.Regular;
         _statusText.color = new Color(0.8f, 0.8f, 0.8f, 1f);
         _statusText.alignment = TextAlignmentOptions.Center;
+        _statusText.raycastTarget = false;
 
         var statusRect = _statusTextObj.GetComponent<RectTransform>();
-        statusRect.anchorMin = new Vector2(0, 0);
-        statusRect.anchorMax = new Vector2(1, 0);
-        statusRect.pivot = new Vector2(0.5f, 0);
-        statusRect.anchoredPosition = new Vector2(0, 35);
-        statusRect.sizeDelta = new Vector2(0, 30);
-    }
-
-    private void SetupButtonStyle(Button button, Color normalColor, Color hoverColor, Color pressedColor)
-    {
-        button.transition = Selectable.Transition.ColorTint;
-        var colors = button.colors;
-        colors.normalColor = normalColor;
-        colors.highlightedColor = hoverColor;
-        colors.pressedColor = pressedColor;
-        colors.disabledColor = new Color(0.3f, 0.3f, 0.3f, 1f);
-        button.colors = colors;
+        statusRect.anchorMin = Vector2.zero;
+        statusRect.anchorMax = Vector2.one;
+        statusRect.offsetMin = Vector2.zero;
+        statusRect.offsetMax = Vector2.zero;
     }
 
     private void Update()
@@ -643,6 +583,8 @@ internal class FFmpegDownloadUI : MonoBehaviour
 
     private void OnDestroy()
     {
+        _window?.Dispose();
+        _window = null;
         _cts?.Dispose();
         if (Instance == this)
         {

UI/LocalizedText.cs

@@ -0,0 +1,112 @@
+using System;
+using ADOFAIRenderer.Localization;
+using TMPro;
+using UnityEngine;
+
+namespace ADOFAIRenderer.UI;
+
+/// <summary>
+/// Component that binds a TextMeshProUGUI component to a localization key or dynamic string provider,
+/// automatically updating the displayed text whenever the active language changes.
+/// </summary>
+internal class LocalizedText : MonoBehaviour
+{
+    private TextMeshProUGUI? _textComponent;
+    private string? _key;
+    private Func<string>? _dynamicProvider;
+
+    /// <summary>
+    /// Gets or sets the localization key. Setting this will clear any dynamic provider.
+    /// </summary>
+    public string? Key
+    {
+        get => _key;
+        set
+        {
+            _key = value;
+            _dynamicProvider = null;
+            Refresh();
+        }
+    }
+
+    /// <summary>
+    /// Sets a dynamic string provider function.
+    /// </summary>
+    public void SetDynamic(Func<string> provider)
+    {
+        _dynamicProvider = provider;
+        _key = null;
+        Refresh();
+    }
+
+    private void Awake()
+    {
+        EnsureComponent();
+        LocalizationManager.OnLanguageChanged += HandleLanguageChanged;
+    }
+
+    private void OnEnable()
+    {
+        Refresh();
+    }
+
+    private void OnDestroy()
+    {
+        LocalizationManager.OnLanguageChanged -= HandleLanguageChanged;
+    }
+
+    private void HandleLanguageChanged(SystemLanguage language)
+    {
+        Refresh();
+    }
+
+    private void EnsureComponent()
+    {
+        if (_textComponent == null)
+        {
+            _textComponent = GetComponent<TextMeshProUGUI>();
+        }
+    }
+
+    /// <summary>
+    /// Refreshes the text using either the dynamic provider or the static localization key.
+    /// </summary>
+    public void Refresh()
+    {
+        EnsureComponent();
+        if (_textComponent == null) return;
+
+        if (_dynamicProvider != null)
+        {
+            _textComponent.text = _dynamicProvider();
+        }
+        else if (!string.IsNullOrEmpty(_key))
+        {
+            _textComponent.text = LocalizationManager.Get(_key);
+        }
+    }
+
+    /// <summary>
+    /// Binds a TextMeshProUGUI component to a localization key.
+    /// </summary>
+    public static LocalizedText Bind(TextMeshProUGUI target, string key)
+    {
+        if (target == null) throw new ArgumentNullException(nameof(target));
+        var component = target.GetComponent<LocalizedText>() ?? target.gameObject.AddComponent<LocalizedText>();
+        component._textComponent = target;
+        component.Key = key;
+        return component;
+    }
+
+    /// <summary>
+    /// Binds a TextMeshProUGUI component to a dynamic string provider function.
+    /// </summary>
+    public static LocalizedText Bind(TextMeshProUGUI target, Func<string> provider)
+    {
+        if (target == null) throw new ArgumentNullException(nameof(target));
+        var component = target.GetComponent<LocalizedText>() ?? target.gameObject.AddComponent<LocalizedText>();
+        component._textComponent = target;
+        component.SetDynamic(provider);
+        return component;
+    }
+}

Util/Audio/AudioSpectrumGenerator.cs

@@ -108,7 +108,7 @@ internal static class AudioSpectrumGenerator
             return;
         }
 
-        var currentFrame = (RenderManager.Instance != null) ? RenderManager.Instance.frameCount : -1;
+        var currentFrame = RenderManager.Instance ? RenderManager.Instance.frameCount : -1;
 
         lock (CachedSpectrums)
         {

Util/Audio/AudioSyncCalculator.cs

@@ -15,11 +15,6 @@ internal class AudioSyncCalculator
     {
         _sampleRate = sampleRate;
         _fpsRational = RationalUtil.Double2MaxPrecisionInt(fps);
-
-        // NTSC
-        if (Math.Abs(fps - 29.97) < 0.001) _fpsRational = (30000, 1001);
-        if (Math.Abs(fps - 59.94) < 0.001) _fpsRational = (60000, 1001);
-        if (Math.Abs(fps - 23.976) < 0.001 || Math.Abs(fps - 23.98) < 0.001) _fpsRational = (24000, 1001);
     }
 
     public void Reset()

Util/FFmpeg/FFmpegNativeEncoder.cs

@@ -63,7 +63,7 @@ namespace ADOFAIRenderer.Util.FFmpeg
             public AVCodecID AudioCodecId;
 
             /// <summary>
-            /// Audio bitrate (in bps). If default (0), 128000 bps is used.
+            /// Audio bitrate (in bps). If default (0), 256000 bps is used.
             /// For AAC, 128000–320000 bps is common.
             /// </summary>
             public int Bitrate;
@@ -83,7 +83,7 @@ namespace ADOFAIRenderer.Util.FFmpeg
             /// <summary>Frames per second (e.g., 60.0, 29.97, etc.).</summary>
             public double FPS;
 
-            /// <summary>Video codec type to use (H264, H265, AV1, VP9).</summary>
+            /// <summary>Video codec type to use (H264, H265, AV1, VP9, VVC).</summary>
             public Codec Codec;
 
             /// <summary>Bitrate control mode (CQP, CBR, VBR).</summary>
@@ -299,6 +299,23 @@ namespace ADOFAIRenderer.Util.FFmpeg
             return GPUUtil.GetPrioritizedEncoders(_settings.Codec, _settings.ForceSoftware).ToArray();
         }
 
+        /// <summary>
+        /// Expands the candidate list into (encoder, input mode) attempts in order.
+        /// A QSV encoder is attempted twice: system memory input mode (useFramePool = false) first,
+        /// then GPU frame pool input mode (useFramePool = true). Other encoders are attempted once (useFramePool = false).
+        /// </summary>
+        private static System.Collections.Generic.IEnumerable<(VideoEncoder Encoder, bool UseFramePool)> ExpandQsvInputModes(VideoEncoder[] candidates)
+        {
+            foreach (var encoder in candidates)
+            {
+                yield return (encoder, false);
+                if (encoder.Kind == EncoderKind.QSV)
+                {
+                    yield return (encoder, true);
+                }
+            }
+        }
+
         /// <summary>
         /// Converts an FFmpeg error code (negative integer) to a human-readable string.
         /// e.g., -1 → "Operation not permitted"
@@ -367,7 +384,7 @@ namespace ADOFAIRenderer.Util.FFmpeg
                     var candidates = GetEncoderCandidates();
                     var openedSuccessfully = false;
 
-                    foreach (var encoder in candidates)
+                    foreach (var (encoder, useFramePool) in ExpandQsvInputModes(candidates))
                     {
                         // avcodec_find_encoder_by_name: Searches for an encoder by name (e.g., "h264_nvenc").
                         // Returns null if the encoder is not included in the build.
@@ -437,16 +454,11 @@ namespace ADOFAIRenderer.Util.FFmpeg
                         // framerate: Framerate value giving hints to the encoder (reciprocal of time_base).
                         //
                         // RationalUtil: Converts FPS (double) into fractional form (numerator/denominator).
-                        //   e.g., 29.97 → 30000/1001 (NTSC standard)
+                        //   e.g., 60.00 -> 60/1
                         //
                         // Reference: https://ffmpeg.org/doxygen/trunk/structAVCodecContext.html
                         var fpsRational = RationalUtil.Double2MaxPrecisionInt(_settings.FPS);
                         
-                        // NTSC
-                        if (Math.Abs(_settings.FPS - 29.97) < 0.001) fpsRational = (30000, 1001);
-                        if (Math.Abs(_settings.FPS - 59.94) < 0.001) fpsRational = (60000, 1001);
-                        if (Math.Abs(_settings.FPS - 23.976) < 0.001 || Math.Abs(_settings.FPS - 23.98) < 0.001) fpsRational = (24000, 1001);
-                        
                         _pCodecContext->time_base = new AVRational
                             { num = fpsRational.Denominator, den = fpsRational.Numerator };
                         _pCodecContext->framerate = new AVRational
@@ -519,9 +531,10 @@ namespace ADOFAIRenderer.Util.FFmpeg
                         //   Strategy 3) Create QSV device directly (legacy method)
                         //               → Fallback on older drivers/systems
                         //
-                        // After obtaining device, attempt using GPU frame pool:
-                        //   hw_frames_ctx: Pre-allocate frame pool in GPU VRAM (zero-copy, highest performance)
-                        //   hw_device_ctx: Encoder reads frames directly from system memory (better compatibility)
+                        // After obtaining device, the input mode is configured (see ExpandQsvInputModes):
+                        //   Input mode 1, hw_device_ctx: Encoder receives NV12 frames from system memory (attempted first)
+                        //   Input mode 2, hw_frames_ctx: Frames are uploaded to a QSV surface pool in GPU memory
+                        //                                (attempted when the encoder cannot be opened in input mode 1)
                         //
                         // Reference: https://ffmpeg.org/doxygen/trunk/group__lavu__hwcontext.html
                         if (encoder.Kind == EncoderKind.QSV)
@@ -590,30 +603,64 @@ namespace ADOFAIRenderer.Util.FFmpeg
                                 continue;
                             }
 
-                            // ── Attempt hw_frames_ctx: Pre-create GPU frame pool ──
-                            // AVHWFramesContext pre-allocates frame pool in GPU VRAM,
-                            // eliminating memory allocation/deallocation overhead for each frame.
+                            if (!useFramePool)
+                            {
+                                // ── Input mode 1 (primary): hw_device_ctx + NV12 system memory ──
+                                // The encoder receives NV12 frames in system memory (RAM) and the QSV runtime uploads them to the GPU.
                                 //
-                            // Pros: Zero-copy capability, highest performance
-                            // Cons: May fail depending on GPU/driver resolution/format constraints
-                            //       (e.g. specific texture size constraints on Intel Arc → E_INVALIDARG)
+                                // pix_fmt is the software format NV12.
+                                // _isQsvEncoder = false: WriteFrame() passes the NV12 frame to the encoder without uploading it.
+                                _pCodecContext->pix_fmt = AVPixelFormat.AV_PIX_FMT_NV12;
+                                _pCodecContext->hw_device_ctx = ffmpeg.av_buffer_ref(hwDeviceCtx);
+                                _isQsvEncoder = false;
+                                Melon<RenderMod>.Logger.Msg($"{encoder.Name}: Using system memory input mode (hw_device_ctx)");
+                            }
+                            else
+                            {
+                                // ── Input mode 2 (fallback): hw_frames_ctx GPU frame pool ──
+                                // Used when the encoder cannot be opened in input mode 1.
+                                // AVHWFramesContext pre-allocates a pool of QSV surfaces in GPU memory (pix_fmt AV_PIX_FMT_QSV),
+                                // and WriteFrame() uploads each NV12 frame to a surface of the pool (av_hwframe_transfer_data).
                                 //
-                            // initial_pool_size: Number of frames to pre-allocate. Matches encoder pipeline depth.
-                            // Align resolution to multiples of 32: Texture alignment condition required by QSV hardware.
+                                // Pool creation depends on the texture types the GPU/driver accepts
+                                // (e.g. Intel Arc A770 rejects NV12 textures with D3D11_BIND_RENDER_TARGET → E_INVALIDARG 0x80070057).
+                                //
+                                // initial_pool_size: Number of surfaces in the pool (QsvFramePoolSize).
+                                //   The encoder keeps submitted surfaces until they are encoded, so the pool has to hold
+                                //   the frames in the encoder pipeline plus the frame being uploaded.
+                                // Width/height are aligned to multiples of 32: texture alignment condition required by QSV hardware.
+                                //
+                                // Frame pool memory type (AVQSVFramesContext.frame_type, a combination of MFX_MEMTYPE_* flags):
+                                //   Windows (D3D11): MFX_MEMTYPE_VIDEO_MEMORY_DECODER_TARGET (0x0010) is tried first, then 0.
+                                //     0x0010 creates the D3D11 textures with D3D11_BIND_DECODER.
+                                //     0 lets FFmpeg select MFX_MEMTYPE_VIDEO_MEMORY_PROCESSOR_TARGET (0x0020),
+                                //     which creates the textures with D3D11_BIND_RENDER_TARGET.
+                                //   Other platforms (VAAPI): 0. FFmpeg sets the memory type of a VAAPI child pool itself.
+                                // Both types are accepted by the QSV encoder as video memory input.
+                                // When every type fails, the next candidate encoder is tested.
                                 //
                                 // Reference:
                                 //   AVHWFramesContext: https://ffmpeg.org/doxygen/trunk/structAVHWFramesContext.html
                                 //   av_hwframe_ctx_alloc: https://ffmpeg.org/doxygen/trunk/group__lavu__hwcontext.html
+                                //   AVQSVFramesContext.frame_type: https://github.com/FFmpeg/FFmpeg/blob/release/8.0/libavutil/hwcontext_qsv.h
+                                //   frame_type → D3D11 bind flags (qsv_init_child_ctx, qsv_get_d3d11va_bind_flags): https://github.com/FFmpeg/FFmpeg/blob/release/8.0/libavutil/hwcontext_qsv.c
+                                //   MFX_MEMTYPE_* values: https://github.com/intel/libvpl/blob/main/api/vpl/mfxstructures.h
                                 bool framesCtxReady = false;
-                            AVBufferRef* hwFramesRef = ffmpeg.av_hwframe_ctx_alloc(hwDeviceCtx);
-                            if (hwFramesRef != null)
+                                int[] frameTypes = isWindows
+                                    ? new[] { QsvMemTypeVideoMemoryDecoderTarget, 0 }
+                                    : new[] { 0 };
+                                foreach (var frameType in frameTypes)
                                 {
+                                    AVBufferRef* hwFramesRef = ffmpeg.av_hwframe_ctx_alloc(hwDeviceCtx);
+                                    if (hwFramesRef == null) break;
+
                                     var framesCtx = (AVHWFramesContext*)hwFramesRef->data;
                                     framesCtx->format = AVPixelFormat.AV_PIX_FMT_QSV;       // Hardware surface format
                                     framesCtx->sw_format = AVPixelFormat.AV_PIX_FMT_NV12;    // Software-side format
                                     framesCtx->width = (_settings.Width + 31) & ~31;          // 32-multiple alignment (bitmask)
                                     framesCtx->height = (_settings.Height + 31) & ~31;        // 32-multiple alignment (bitmask)
-                                framesCtx->initial_pool_size = 4;                         // Frame pool size
+                                    framesCtx->initial_pool_size = QsvFramePoolSize;
+                                    SetQsvFrameType(framesCtx, frameType);
 
                                     err = ffmpeg.av_hwframe_ctx_init(hwFramesRef);
                                     if (err >= 0)
@@ -623,31 +670,30 @@ namespace ADOFAIRenderer.Util.FFmpeg
                                         _pCodecContext->hw_frames_ctx = ffmpeg.av_buffer_ref(hwFramesRef);
                                         _isQsvEncoder = true;
                                         framesCtxReady = true;
-                                    Melon<RenderMod>.Logger.Msg($"{encoder.Name}: hw_frames_ctx initialization succeeded (GPU frame pool mode)");
+                                        Melon<RenderMod>.Logger.Msg($"{encoder.Name}: Using GPU frame pool input mode (hw_frames_ctx, frame_type=0x{frameType:X4}, pool={QsvFramePoolSize})");
+                                        ffmpeg.av_buffer_unref(&hwFramesRef);
 
                                         _pHwFrame = ffmpeg.av_frame_alloc();
                                         if (_pHwFrame == null)
                                             throw new Exception("Failed to allocate QSV hardware frame structure.");
+                                        break;
                                     }
-                                else
-                                {
-                                    Melon<RenderMod>.Logger.Warning($"{encoder.Name}: hw_frames_ctx failed — {GetFFmpegErrorString(err)} (Code: {err}). Falling back to hw_device_ctx mode.");
-                                }
+
+                                    Melon<RenderMod>.Logger.Warning($"{encoder.Name}: hw_frames_ctx failed with frame_type=0x{frameType:X4} — {GetFFmpegErrorString(err)} (Code: {err})");
                                     ffmpeg.av_buffer_unref(&hwFramesRef);
                                 }
 
-                            // ── When hw_frames_ctx fails: Fallback to hw_device_ctx + NV12 system memory ──
-                            // In hw_device_ctx mode, the encoder receives NV12 frames from system memory (RAM)
-                            // directly and uploads to GPU internally.
-                            // Slightly slower than hw_frames_ctx, but compatibility is much better.
-                            //
-                            // Change pix_fmt to NV12: Use software format directly instead of hardware surface (QSV).
-                            // _isQsvEncoder = false: Skip manual upload in WriteFrame().
                                 if (!framesCtxReady)
                                 {
-                                _pCodecContext->pix_fmt = AVPixelFormat.AV_PIX_FMT_NV12;
-                                _pCodecContext->hw_device_ctx = ffmpeg.av_buffer_ref(hwDeviceCtx);
-                                _isQsvEncoder = false; // System memory mode, no manual frame upload required
+                                    Melon<RenderMod>.Logger.Warning($"{encoder.Name}: GPU frame pool input mode is unavailable. Testing next candidate codec.");
+                                    ffmpeg.av_buffer_unref(&hwDeviceCtx);
+                                    {
+                                        var pCtx = _pCodecContext;
+                                        ffmpeg.avcodec_free_context(&pCtx);
+                                    }
+                                    _pCodecContext = null;
+                                    continue;
+                                }
                             }
 
                             // Transfer ownership of hwDeviceCtx to codec context,
@@ -709,11 +755,19 @@ namespace ADOFAIRenderer.Util.FFmpeg
                             break;
                         }
 
-                        // If open fails, free codec context and try next encoder.
-                        Melon<RenderMod>.Logger.Warning($"Failed to initialize hardware encoder {encoder.Name}: {GetFFmpegErrorString(openResult)} (Code: {openResult}). Testing next candidate codec.");
+                        // If open fails, free codec context and QSV frame state, then try next candidate.
+                        var inputMode = encoder.Kind == EncoderKind.QSV ? (useFramePool ? " (GPU frame pool input mode)" : " (system memory input mode)") : "";
+                        Melon<RenderMod>.Logger.Warning($"Failed to initialize encoder {encoder.Name}{inputMode}: {GetFFmpegErrorString(openResult)} (Code: {openResult}). Testing next candidate.");
                         var pCodecCtx = _pCodecContext;
                         ffmpeg.avcodec_free_context(&pCodecCtx);
                         _pCodecContext = null;
+                        _isQsvEncoder = false;
+                        if (_pHwFrame != null)
+                        {
+                            var pHwFrame = _pHwFrame;
+                            ffmpeg.av_frame_free(&pHwFrame);
+                            _pHwFrame = null;
+                        }
                     }
 
                     if (!openedSuccessfully || _pCodecContext == null)
@@ -728,6 +782,16 @@ namespace ADOFAIRenderer.Util.FFmpeg
                     if (ffmpeg.avcodec_parameters_from_context(_pVideoStream->codecpar, _pCodecContext) < 0)
                         throw new Exception("Failed to copy codec parameters to stream.");
 
+                    // Stream time base: unit of the timestamps stored in the container.
+                    // Set to the codec time base (1 / framerate) so that every frame interval is a whole number of ticks.
+                    // When it is left unset, the muxer uses 1/90000, in which the interval of rates such as
+                    // 59.94 fps (1501.5 ticks), 23.976 fps (3753.75 ticks) or 165 fps (545.45 ticks) is not an integer,
+                    // and the frame durations alternate between two values.
+                    // The muxer may still adjust the value in avformat_write_header (e.g. mp4 scales it to at least 10000);
+                    // packet timestamps are rescaled to the final value in SendFrameAndWritePackets.
+                    // Reference: https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/mux.c (init_muxer: default 1/90000)
+                    _pVideoStream->time_base = _pCodecContext->time_base;
+
                     // ── Step 4.5 (Optional): Initialize audio stream ──
                     // If EncoderSettings.Audio is set, add audio stream.
                     if (_settings.Audio.HasValue)
@@ -760,16 +824,7 @@ namespace ADOFAIRenderer.Util.FFmpeg
                     if (_pSrcFrame == null || _pDstFrame == null || _pPacket == null)
                         throw new Exception("Failed to allocate frame or packet structure.");
 
-                    // Set format and size of destination frame, then allocate actual pixel buffer.
-                    // av_frame_get_buffer: Allocates memory matching format, width, height and
-                    // sets data[]/linesize[] pointers. Second argument 0 means default alignment.
-                    _pDstFrame->format = (int)_dstPixFmt;
-                    _pDstFrame->width = _settings.Width;
-                    _pDstFrame->height = _settings.Height;
-                    _pDstFrame->color_range = AVColorRange.AVCOL_RANGE_JPEG;
-
-                    if (ffmpeg.av_frame_get_buffer(_pDstFrame, 0) < 0)
-                        throw new Exception($"Failed to allocate {_dstPixFmt} frame buffer.");
+                    AllocateDstFrameBuffer();
 
                     // sws_getContext: Initialize software scaler (colorspace converter).
                     // Input: RGBA (Unity capture format, 4 bytes/pixel)
@@ -830,7 +885,7 @@ namespace ADOFAIRenderer.Util.FFmpeg
         /// Reference - CQP options per encoder:
         ///   NVENC:     "qp" (single value applied to I/P/B frames)
         ///   AMF:       "qp_i" + "qp_p" (I-frame and P-frame configured separately)
-        ///   QSV:       "global_quality" (Intel unique option)
+        ///   QSV:       AVCodecContext.global_quality (Intel ICQ mode)
         ///   Software:  "crf" (Constant Rate Factor, smarter quality control)
         ///
         /// Reference: https://ffmpeg.org/doxygen/trunk/structAVCodecContext.html
@@ -852,11 +907,21 @@ namespace ADOFAIRenderer.Util.FFmpeg
                         _pCodecContext->rc_max_rate = _pCodecContext->rc_min_rate = _settings.TargetBitrate * 1000L;
                         _pCodecContext->rc_buffer_size = _settings.TargetBitrate * 1000;
 
-                        // nal-hrd=cbr: x264/x265 dedicated option. Generates CBR bitstream matching
-                        // NAL HRD (Hypothetical Reference Decoder) specification. May be required for streaming compatibility.
-                        if (encoder == VideoEncoder.Libx264 || encoder == VideoEncoder.Libx265)
+                        // HRD (Hypothetical Reference Decoder) signaling for CBR output, used for streaming compatibility.
+                        //   libx264: "nal-hrd=cbr" writes the NAL HRD information and pads filler data to keep the bitrate constant.
+                        //            FFmpeg's option description: "Signal HRD information (requires vbv-bufsize; cbr not allowed in .mp4)".
+                        //            Reference: https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/libx264.c ("nal-hrd": none/vbr/cbr)
+                        //   libx265: "x265-params" = "hrd=1" (--hrd: "Enable the signaling of HRD parameters to the decoder")
+                        //            + "strict-cbr=1" (--strict-cbr: "Enables stricter conditions to control bitrate deviance
+                        //            from the target bitrate in ABR mode").
+                        //            Reference: https://x265.readthedocs.io/en/master/cli.html
+                        if (encoder == VideoEncoder.Libx264)
                         {
-                            ffmpeg.av_opt_set(_pCodecContext->priv_data, "nal-hrd", "cbr", 0);
+                            TrySetOption("nal-hrd", "cbr");
+                        }
+                        else if (encoder == VideoEncoder.Libx265)
+                        {
+                            TrySetOption("x265-params", "hrd=1:strict-cbr=1");
                         }
                     }
                     break;
@@ -880,38 +945,77 @@ namespace ADOFAIRenderer.Util.FFmpeg
                     break;
 
                 case RateControlMode.CQP:
+                    // Valid quality range per encoder. The range of the private options is read from the
+                    // encoder's option definition (AVOption min/max); a declared minimum of -1 means "auto".
+                    //   NVENC:    "qp"    H.264/HEVC 0~51, AV1 0~255
+                    //             (libavcodec/nvenc_h264.c, nvenc_hevc.c: "qp" -1~51 / libavcodec/nvenc_av1.c: "qp" -1~255)
+                    //   AMF:      "qp_i"  H.264/HEVC 0~51, AV1 0~255
+                    //             (libavcodec/amfenc_h264.c, amfenc_hevc.c: "qp_i" -1~51 / libavcodec/amfenc_av1.c: "qp_i" -1~255)
+                    //   QSV:      AVCodecContext.global_quality 1~51
+                    //   VVC:      "qp"    0~63 (libavcodec/libvvenc.c: "qp" -1~63)
+                    //   Software: "crf"   x264/x265 0~51 (https://x265.readthedocs.io/en/master/cli.html: --crf 0..51.0),
+                    //             VP9/AV1 0~63 (libavcodec/libvpxenc.c, libaomenc.c: "crf" -1~63 / libavcodec/libsvtav1.c: "crf" 0~63)
+                    // Reference: https://github.com/FFmpeg/FFmpeg/tree/master/libavcodec
+                    int qpMin, qpMax;
+                    if (encoder.Kind == EncoderKind.QSV)
+                    {
+                        // QSV runs in ICQ (Intelligent Constant Quality) mode when global_quality > 0 and rc_max_rate is 0;
+                        // global_quality 0 selects the encoder's default CQP. The ICQ quality is clamped to 1~51 by FFmpeg:
+                        //   libavcodec/qsvenc.c: q->param.mfx.ICQQuality = av_clip(avctx->global_quality, 1, 51);
+                        // Reference: https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/qsvenc.c
+                        qpMin = 1;
+                        qpMax = 51;
+                    }
+                    else if (encoder.Kind == EncoderKind.NVENC) (qpMin, qpMax) = GetQualityRange("qp");
+                    else if (encoder.Kind == EncoderKind.AMF) (qpMin, qpMax) = GetQualityRange("qp_i");
+                    else if (encoder == VideoEncoder.LibVvenc) (qpMin, qpMax) = GetQualityRange("qp");
+                    else (qpMin, qpMax) = GetQualityRange("crf"); // Software encoder (libx264, libx265, libvpx-vp9, etc.)
+
                     // Default value 18: Quality close to "visually lossless" in H.264.
                     // Provides similar level of quality in other codecs as well.
-                    var qpValue = _settings.QualityValue is >= 0 and <= 51 ? _settings.QualityValue : 18;
+                    const int defaultQuality = 18;
+                    var requestedQp = _settings.QualityValue;
+                    int qpValue;
+                    if (requestedQp < 0)
+                    {
+                        qpValue = Math.Clamp(defaultQuality, qpMin, qpMax);
+                        Melon<RenderMod>.Logger.Warning($"{encoder.Name}: Invalid quality value {requestedQp}. Using {qpValue}.");
+                    }
+                    else
+                    {
+                        qpValue = Math.Clamp(requestedQp, qpMin, qpMax);
+                        if (qpValue != requestedQp)
+                            Melon<RenderMod>.Logger.Warning($"{encoder.Name}: Quality value {requestedQp} is outside the supported range {qpMin}~{qpMax}. Using {qpValue}.");
+                    }
 
                     if (encoder.Kind == EncoderKind.NVENC)
                     {
                         // NVENC: Applies same QP to I/P/B frames with single "qp" option
-                        ffmpeg.av_opt_set(_pCodecContext->priv_data, "qp", qpValue.ToString(), 0);
+                        TrySetOption("qp", qpValue.ToString());
                     }
                     else if (encoder.Kind == EncoderKind.AMF)
                     {
                         // AMF: QP for I-frame (qp_i) and P-frame (qp_p) must be set separately.
                         // Since B-frames are disabled, qp_b is not set.
-                        ffmpeg.av_opt_set(_pCodecContext->priv_data, "qp_i", qpValue.ToString(), 0);
-                        ffmpeg.av_opt_set(_pCodecContext->priv_data, "qp_p", qpValue.ToString(), 0);
+                        TrySetOption("qp_i", qpValue.ToString());
+                        TrySetOption("qp_p", qpValue.ToString());
                     }
                     else if (encoder.Kind == EncoderKind.QSV)
                     {
-                        // QSV: Uses ICQ (Intelligent Constant Quality) mode with "global_quality" option
-                        ffmpeg.av_opt_set(_pCodecContext->priv_data, "global_quality", qpValue.ToString(), 0);
+                        // QSV: ICQ (Intelligent Constant Quality) mode, configured with AVCodecContext.global_quality.
+                        _pCodecContext->global_quality = qpValue;
                     }
                     else if (encoder == VideoEncoder.LibVvenc)
                     {
                         // libvvenc: Specifies Constant QP mode with "qp" option
-                        ffmpeg.av_opt_set(_pCodecContext->priv_data, "qp", qpValue.ToString(), 0);
+                        TrySetOption("qp", qpValue.ToString());
                     }
-                    else // Software encoder (libx264, libx265, libvpx-vp9, etc.)
+                    else
                     {
                         // CRF (Constant Rate Factor): Smarter quality control than QP.
                         // Automatically adjusts bitrate according to scene complexity to maintain consistent visual quality.
-                        // Range: 0 (lossless) ~ 51 (lowest quality). Typically between 18 and 28.
-                        ffmpeg.av_opt_set(_pCodecContext->priv_data, "crf", qpValue.ToString(), 0);
+                        // Range: 0 (lossless) ~ 51 (lowest quality) for x264/x265, 0~63 for VP9/AV1. Typically between 18 and 28.
+                        TrySetOption("crf", qpValue.ToString());
                     }
                     break;
                 default:
@@ -919,6 +1023,76 @@ namespace ADOFAIRenderer.Util.FFmpeg
             }
         }
 
+        /// <summary>
+        /// Sets a private option (priv_data) of the encoder.
+        /// Returns true when FFmpeg accepts the option. Otherwise logs a warning with the FFmpeg error and returns false.
+        /// </summary>
+        // ReSharper disable once UnusedMethodReturnValue.Local
+        private bool TrySetOption(string name, string value)
+        {
+            var ret = ffmpeg.av_opt_set(_pCodecContext->priv_data, name, value, 0);
+            if (ret >= 0) return true;
+
+            Melon<RenderMod>.Logger.Warning($"[Encoder] Option '{name}={value}' was not applied: {GetFFmpegErrorString(ret)} (Code: {ret})");
+            return false;
+        }
+
+        /// <summary>
+        /// MFX_MEMTYPE_VIDEO_MEMORY_DECODER_TARGET (0x0010): frames are in video memory and belong to video decoder render targets.
+        /// Reference: https://github.com/intel/libvpl/blob/main/api/vpl/mfxstructures.h
+        /// </summary>
+        private const int QsvMemTypeVideoMemoryDecoderTarget = 0x0010;
+
+        /// <summary>
+        /// Number of surfaces in the QSV GPU frame pool (AVHWFramesContext.initial_pool_size) of GPU frame pool input mode.
+        /// Same value as the encoder frame pool of the FFmpeg hardware encoding example (initial_pool_size = 20).
+        /// Reference: https://github.com/FFmpeg/FFmpeg/blob/release/8.0/doc/examples/vaapi_encode.c
+        /// </summary>
+        private const int QsvFramePoolSize = 20;
+
+        /// <summary>
+        /// Writes AVQSVFramesContext.frame_type of a QSV frames context (AVHWFramesContext.hwctx).
+        /// FFmpeg.AutoGen has no AVQSVFramesContext type, so the field is written at its offset.
+        /// Field order of AVQSVFramesContext: mfxFrameSurface1* surfaces, int nb_surfaces, int frame_type, mfxFrameInfo* info
+        /// → frame_type is at offset sizeof(pointer) + sizeof(int) (12 bytes on 64-bit).
+        /// Reference: https://github.com/FFmpeg/FFmpeg/blob/release/8.0/libavutil/hwcontext_qsv.h
+        /// </summary>
+        private static void SetQsvFrameType(AVHWFramesContext* framesCtx, int frameType)
+        {
+            if (framesCtx->hwctx == null) return;
+            *(int*)((byte*)framesCtx->hwctx + IntPtr.Size + sizeof(int)) = frameType;
+        }
+
+        /// <summary>
+        /// Largest declared maximum that is treated as an actual quality range.
+        /// A declared maximum above this value is treated as unbounded, and the fallback range 0~51 is used.
+        /// The largest bounded quality range among the supported encoders is 0~255 (AV1 NVENC/AMF), while
+        /// libx264/libx265 declare "crf" as -1~FLT_MAX (libavcodec/libx264.c, libx265.c).
+        /// </summary>
+        private const double MaxMeaningfulQualityLimit = 1000;
+
+        /// <summary>
+        /// Returns the valid range of a private quality option of the encoder from its option definition (AVOption min/max).
+        /// e.g. 0~51 for H.264/HEVC, 0~63 for VP9/AV1/VVC, 0~255 for AV1 NVENC/AMF.
+        /// The lower bound is at least 0 (a declared minimum of -1 means "auto").
+        /// When the option is missing or its declared maximum is unbounded (see <see cref="MaxMeaningfulQualityLimit"/>), returns 0~51,
+        /// the QP scale of H.264/HEVC 8-bit (x264/x265 CRF 0~51).
+        /// Reference: https://x265.readthedocs.io/en/master/cli.html (--crf 0..51.0)
+        /// </summary>
+        /// <param name="optionName">Name of the quality option in priv_data.</param>
+        private (int Min, int Max) GetQualityRange(string optionName)
+        {
+            const int fallbackMax = 51;
+
+            var option = ffmpeg.av_opt_find(_pCodecContext->priv_data, optionName, null, 0, 0);
+            if (option == null || !(option->max > 0 && option->max <= MaxMeaningfulQualityLimit))
+                return (0, fallbackMax);
+
+            var min = Math.Max(0, (int)Math.Ceiling(option->min));
+            var max = (int)Math.Floor(option->max);
+            return min <= max ? (min, max) : (0, fallbackMax);
+        }
+
         // ================================================================
         // Write Frame
         // ================================================================
@@ -1018,12 +1192,50 @@ namespace ADOFAIRenderer.Util.FFmpeg
             }
         }
 
+        /// <summary>
+        /// Sets the format, size and color range of the destination frame (_pDstFrame) and allocates a new pixel buffer for it.
+        /// av_frame_get_buffer allocates memory matching format, width and height and sets the data[]/linesize[] pointers.
+        /// Second argument 0 means default alignment.
+        /// Reference: https://ffmpeg.org/doxygen/trunk/group__lavu__frame.html (av_frame_get_buffer)
+        /// </summary>
+        private void AllocateDstFrameBuffer()
+        {
+            _pDstFrame->format = (int)_dstPixFmt;
+            _pDstFrame->width = _settings.Width;
+            _pDstFrame->height = _settings.Height;
+            _pDstFrame->color_range = AVColorRange.AVCOL_RANGE_JPEG;
+
+            var ret = ffmpeg.av_frame_get_buffer(_pDstFrame, 0);
+            if (ret < 0)
+                throw new Exception($"Failed to allocate {_dstPixFmt} frame buffer — {GetFFmpegErrorString(ret)} (Code: {ret})");
+        }
+
+        /// <summary>
+        /// Makes the pixel buffer of the destination frame (_pDstFrame) writable before the next frame is written into it.
+        ///
+        /// After avcodec_send_frame, the encoder may keep a reference to the buffer of the submitted frame
+        /// until that frame is encoded (e.g. QSV in system memory input mode). The buffer is then shared and not writable
+        /// (av_frame_is_writable returns 0).
+        /// In that case the frame releases its reference (av_frame_unref) and a new buffer is allocated.
+        /// The encoder keeps the previous buffer until it no longer needs it. The previous contents are not copied,
+        /// because every plane is overwritten by the next frame.
+        ///
+        /// Reference: https://ffmpeg.org/doxygen/trunk/group__lavu__frame.html (av_frame_is_writable, av_frame_unref)
+        /// </summary>
+        private void PrepareDstFrameForWrite()
+        {
+            if (ffmpeg.av_frame_is_writable(_pDstFrame) != 0) return;
+
+            ffmpeg.av_frame_unref(_pDstFrame);
+            AllocateDstFrameBuffer();
+        }
+
         /// <summary>
         /// Encodes a frame by directly copying already pre-converted NV12 or YUV420P frame data.
         /// </summary>
         private void WritePreConvertedFrame(byte* buffer)
         {
-            ffmpeg.av_frame_make_writable(_pDstFrame);
+            PrepareDstFrameForWrite();
 
             var width = _settings.Width;
             var height = _settings.Height;
@@ -1137,20 +1349,17 @@ namespace ADOFAIRenderer.Util.FFmpeg
         /// Core logic for actual frame encoding.
         ///
         /// Processing flow:
-        ///   1. av_frame_make_writable: Check if destination frame buffer is writable
+        ///   1. PrepareDstFrameForWrite: Makes the destination frame buffer writable
         ///      (Allocates a new buffer if encoder is still referencing previous frame's buffer)
         ///   2. sws_scale: RGBA → YUV420P/NV12 colorspace conversion
         ///   3. (QSV hw_frames mode) av_hwframe_transfer_data: Upload NV12 → QSV hardware surface
         ///   4. Pass to encoder after setting PTS
         ///
-        /// Reference: https://ffmpeg.org/doxygen/trunk/group__lavu__frame.html (av_frame_make_writable)
         /// Reference: https://ffmpeg.org/doxygen/trunk/group__libsws.html (sws_scale)
         /// </summary>
         private void WriteFrame()
         {
-            // Ensure writable state since encoder might still be referencing previous frame's buffer.
-            // Internally allocates a new buffer if referenced.
-            ffmpeg.av_frame_make_writable(_pDstFrame);
+            PrepareDstFrameForWrite();
 
             // ── Colorspace conversion: RGBA → YUV420P or NV12 ──
             // sws_scale parameters explanation:
@@ -1311,8 +1520,13 @@ namespace ADOFAIRenderer.Util.FFmpeg
         ///   2. av_write_trailer: Writes container trailer (end-of-file metadata).
         ///      For MP4, the moov atom (index info) is completed here.
         ///      ⚠️ If trailer is not written, the file becomes corrupted and unplayable!
+        ///      av_write_trailer also flushes the output buffer and returns the write error of the output (AVIOContext.error), if any.
+        ///
+        /// Throws an exception when a flush or the trailer fails (e.g. the disk is full), because the file is then incomplete.
+        /// End() runs once: after it returns or throws, further calls return immediately.
         ///
         /// Reference: https://ffmpeg.org/doxygen/trunk/group__lavf__encoding.html
+        /// Reference: https://github.com/FFmpeg/FFmpeg/blob/release/8.0/libavformat/mux.c (av_write_trailer)
         /// </summary>
         public void End()
         {
@@ -1320,39 +1534,31 @@ namespace ADOFAIRenderer.Util.FFmpeg
             {
                 if (_disposed || !_isInitialized) return;
 
-                // 1. Flush delayed frames from video encoder (send null frame as "end of input" signal)
                 try
                 {
+                    // 1. Flush delayed frames from video encoder (send null frame as "end of input" signal)
                     SendFrameAndWritePackets(null);
-                }
-                catch (Exception ex)
-                {
-                    // Log error occurring during flush process
-                    Melon<RenderMod>.Logger.Error($"Error during video encoder flush: {ex.Message}");
-                }
 
                     // 1.5. Flush remaining samples in audio FIFO + flush audio encoder
                     if (_audioEnabled)
-                {
-                    try
                     {
                         FlushAudioEncoder();
                     }
-                    catch (Exception ex)
-                    {
-                        Melon<RenderMod>.Logger.Error($"Error during audio encoder flush: {ex.Message}");
-                    }
-                }
 
                     // 2. Write container trailer (moov atom and file termination metadata)
                     if (_pFormatContext != null)
                     {
-                    ffmpeg.av_write_trailer(_pFormatContext);
+                        var ret = ffmpeg.av_write_trailer(_pFormatContext);
+                        if (ret < 0)
+                            throw new Exception($"Failed to write the container trailer — {GetFFmpegErrorString(ret)} (Code: {ret})");
                     }
-
+                }
+                finally
+                {
                     _isInitialized = false;
                 }
             }
+        }
 
         // ================================================================
         // Resource Cleanup (Dispose)
@@ -1361,11 +1567,13 @@ namespace ADOFAIRenderer.Util.FFmpeg
         /// <summary>
         /// Actual resource cleanup logic. Cleanup order is important:
         ///
-        ///   1. Call End() (if not called yet) → flush delayed frames + write trailer
-        ///   2. SwsContext (scaler) → independent, can be freed first
-        ///   3. AVFrame (src/dst) → freed before codec as codec may reference them
-        ///   4. AVCodecContext (codec) → hw_frames_ctx/hw_device_ctx freed together
-        ///   5. AVFormatContext (format/IO) → includes closing file handle
+        ///   1. SwsContext (scaler) → independent, can be freed first
+        ///   2. AVFrame (src/dst) → freed before codec as codec may reference them
+        ///   3. AVCodecContext (codec) → hw_frames_ctx/hw_device_ctx freed together
+        ///   4. AVFormatContext (format/IO) → includes closing file handle
+        ///
+        /// Dispose does not finish the file (no encoder flush, no trailer). A file is complete only after End() returned.
+        /// Without End(), the output file is incomplete and is left to the caller (the renderer deletes it).
         ///
         /// Reference:
         ///   av_frame_free: https://ffmpeg.org/doxygen/trunk/group__lavu__frame.html
@@ -1379,12 +1587,7 @@ namespace ADOFAIRenderer.Util.FFmpeg
             {
                 if (_disposed) return;
                 _disposed = true;
-
-                // Trigger End() safely in case Dispose is called without calling End() first
-                if (_isInitialized)
-                {
-                    try { End(); } catch { /* Ignore */ }
-                }
+                _isInitialized = false;
 
                 // Release Sws scaler
                 if (_pSwsContext != null)

Util/FrameReader.cs

@@ -27,11 +27,33 @@ namespace ADOFAIRenderer.Util
         private bool _isInitialized;
         private volatile bool _isDisposed;
 
-        private readonly AVPixelFormat _targetFormat;
+        private readonly ComputeShader? _computeShader;
+        private readonly int _kernelIndex = -1;
+        private readonly bool _useGPUConversion;
+        private readonly AVPixelFormat _expectedFormat;
 
         public FrameReader(AVPixelFormat targetFormat)
         {
-            _targetFormat = targetFormat;
+            _computeShader = ModAssets.ColorConversionShader;
+            if (_computeShader)
+            {
+                var kernelName = targetFormat switch
+                {
+                    AVPixelFormat.AV_PIX_FMT_NV12 => "CSMain_NV12",
+                    AVPixelFormat.AV_PIX_FMT_YUV420P => "CSMain_YUV420P",
+                    _ => null
+                };
+
+                if (kernelName != null)
+                {
+                    try { _kernelIndex = _computeShader.FindKernel(kernelName); }
+                    catch { _kernelIndex = -1; }
+                }
+            }
+
+            _useGPUConversion = _kernelIndex >= 0;
+            _expectedFormat = _useGPUConversion ? targetFormat : AVPixelFormat.AV_PIX_FMT_RGBA;
+
             InitializePool();
         }
 
@@ -71,42 +93,22 @@ namespace ADOFAIRenderer.Util
                 state.IsInFlight = true;
             }
 
-            // Check if GPU color conversion is available
-            var expectedFmt = AVPixelFormat.AV_PIX_FMT_RGBA;
-
-            var kernelIndex = -1;
-            if (ModAssets.ColorConversionShader)
-            {
-                var kernalName = _targetFormat switch
-                {
-                    AVPixelFormat.AV_PIX_FMT_NV12 => "CSMain_NV12",
-                    AVPixelFormat.AV_PIX_FMT_YUV420P => "CSMain_YUV420P",
-                    _ => null
-                };
-
-                if (kernalName != null)
-                    kernelIndex = ModAssets.ColorConversionShader.FindKernel(kernalName);
-            }
-
-            var useGPUConversion = kernelIndex >= 0;
-            if (useGPUConversion) expectedFmt = _targetFormat;
-
             var bufferSize = texture.width * texture.height * 4; // RGBA = 4 channel
-            state.Setup(currentFrame, bufferSize, useGPUConversion, expectedFmt, texture.width, texture.height);
+            state.Setup(currentFrame, bufferSize, _useGPUConversion, _expectedFormat, texture.width, texture.height);
 
-            if (useGPUConversion && state.GPUBuffer != null && ModAssets.ColorConversionShader)
+            if (_useGPUConversion && state.GPUBuffer != null && _computeShader)
             {
-                ModAssets.ColorConversionShader.SetTexture(kernelIndex, SourceTexture, texture);
-                ModAssets.ColorConversionShader.SetBuffer(kernelIndex, DestinationBuffer, state.GPUBuffer);
-                ModAssets.ColorConversionShader.SetInt(Width, texture.width);
-                ModAssets.ColorConversionShader.SetInt(Height, texture.height);
+                _computeShader.SetTexture(_kernelIndex, SourceTexture, texture);
+                _computeShader.SetBuffer(_kernelIndex, DestinationBuffer, state.GPUBuffer);
+                _computeShader.SetInt(Width, texture.width);
+                _computeShader.SetInt(Height, texture.height);
 
-                var threadGroupsX = expectedFmt == AVPixelFormat.AV_PIX_FMT_NV12
+                var threadGroupsX = _expectedFormat == AVPixelFormat.AV_PIX_FMT_NV12
                     ? (texture.width + 31) / 32
                     : (texture.width + 63) / 64;
                 var threadGroupsY = (texture.height + 15) / 16;
 
-                ModAssets.ColorConversionShader.Dispatch(kernelIndex, threadGroupsX, threadGroupsY, 1);
+                _computeShader.Dispatch(_kernelIndex, threadGroupsX, threadGroupsY, 1);
 
                 AsyncGPUReadback.RequestIntoNativeArray(
                     ref state.NativeBuffer, state.GPUBuffer, state.CachedCallback
@@ -138,7 +140,7 @@ namespace ADOFAIRenderer.Util
                 }
             }
 
-            if (RenderManager.Instance && RenderManager.Instance.IsRenderCancelled)
+            if (RenderManager.Instance && RenderManager.Instance.IsRenderAborted)
             {
                 RecycleState(state);
                 return;

Util/GPUUtil.cs

@@ -4,6 +4,7 @@ using System.Linq;
 using System.Text.RegularExpressions;
 using ADOFAIRenderer.Data;
 using ADOFAIRenderer.Util.FFmpeg;
+using ADOFAIRenderer.Util.OS;
 using MelonLoader;
 using UnityEngine;
 
@@ -121,7 +122,7 @@ internal static class GPUUtil
                 !int.TryParse(regMatch.Groups[4].Value, out var build)) continue;
                             
             var nvidiaVerInt = sub % 10 * 10000 + build;
-            _cachedNvidiaVersion = nvidiaVerInt / 100f;
+            _cachedNvidiaVersion = nvidiaVerInt / 100.0;
             Melon<RenderMod>.Logger.Msg($"Parsed NVIDIA Driver Version from Registry (RegistryUtil): {_cachedNvidiaVersion:F2}");
             return _cachedNvidiaVersion;
         }

Util/OS/FolderDialogUtil.cs

@@ -8,7 +8,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using MelonLoader;
 
-namespace ADOFAIRenderer.Util;
+namespace ADOFAIRenderer.Util.OS;
 
 [SuppressMessage("ReSharper", "InconsistentNaming")]
 [SuppressMessage("ReSharper", "UnusedMember.Local")]

Util/OS/OSNotification.cs

@@ -0,0 +1,577 @@
+using System;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using System.Threading;
+using MelonLoader;
+
+namespace ADOFAIRenderer.Util.OS;
+
+/// <summary>
+/// Sends native desktop notifications on Windows, macOS, and Linux.
+/// <para>
+/// - <b>Windows</b>: Uses Win32 <c>Shell_NotifyIcon</c> (system tray balloon) via P/Invoke.
+///   No PowerShell, no UWP, no WinRT dependencies.
+/// </para>
+/// <para>
+/// - <b>macOS</b>: Uses <c>osascript</c> with AppleScript's <c>display notification</c>.
+/// </para>
+/// <para>
+/// - <b>Linux</b>: Uses <c>notify-send</c> (libnotify) with <c>xdg-open</c> for folder actions.
+/// </para>
+/// </summary>
+internal static class OSNotification
+{
+    /// <summary>
+    /// Sends a native desktop notification.
+    /// If <paramref name="folderPath"/> is provided, Windows and Linux will attempt to open
+    /// the folder when the notification is clicked/dismissed.
+    /// </summary>
+    /// <param name="title">The notification title.</param>
+    /// <param name="message">The notification body text.</param>
+    /// <param name="folderPath">Optional folder path to open on click (Windows balloon click / Linux action).</param>
+    public static void Show(string title, string message, string? folderPath = null)
+    {
+        try
+        {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                WindowsNotification.Send(title, message, folderPath);
+            }
+            else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
+            {
+                MacNotification.Send(title, message);
+            }
+            else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+            {
+                LinuxNotification.Send(title, message, folderPath);
+            }
+        }
+        catch (Exception ex)
+        {
+            MelonLogger.Warning($"[OSNotification] Failed to send notification: {ex.Message}");
+        }
+    }
+
+    #region Windows — Toast (primary) + Shell_NotifyIcon (fallback)
+
+    /// <summary>
+    /// Windows notification with two strategies:
+    /// <para>1. <b>Toast</b> via PowerShell — persists in Action Center.</para>
+    /// <para>2. <b>Shell_NotifyIcon balloon</b> via P/Invoke — fallback if toast fails.</para>
+    /// </summary>
+    private static class WindowsNotification
+    {
+        public static void Send(string title, string message, string? folderPath)
+        {
+            var thread = new Thread(() =>
+            {
+                try
+                {
+                    if (!TrySendToast(title, message, folderPath))
+                    {
+                        SendBalloon(title, message, folderPath);
+                    }
+                }
+                catch (Exception ex)
+                {
+                    MelonLogger.Warning($"[OSNotification] Windows notification failed: {ex.Message}");
+                }
+            })
+            {
+                IsBackground = true,
+                Name = "OSNotification-Win"
+            };
+            thread.Start();
+        }
+
+        #region Toast via PowerShell
+
+        /// <summary>
+        /// Attempts to show a Windows Toast notification via PowerShell.
+        /// Returns true if the process launched successfully, false otherwise.
+        /// </summary>
+        private static bool TrySendToast(string title, string message, string? folderPath)
+        {
+            try
+            {
+                string xmlTitle = System.Security.SecurityElement.Escape(title) ?? title;
+                string xmlMessage = System.Security.SecurityElement.Escape(message) ?? message;
+
+                string toastXml;
+                string psScript;
+
+                if (!string.IsNullOrEmpty(folderPath))
+                {
+                    var escapedFolder = folderPath.Replace("'", "''");
+
+                    toastXml =
+                        "<toast launch=\"adofai-renderer://\" activationType=\"protocol\">" +
+                        "<visual><binding template=\"ToastGeneric\">" +
+                        $"<text>{xmlTitle}</text><text>{xmlMessage}</text>" +
+                        "</binding></visual>" +
+                        "<actions>" +
+                        "<action content=\"Open Render Folder\" arguments=\"adofai-renderer://\" activationType=\"protocol\"/>" +
+                        "</actions></toast>";
+
+                    psScript =
+                        "$protocolPath = 'HKCU:\\Software\\Classes\\adofai-renderer'\n" +
+                        "$null = New-Item -Path $protocolPath -Force\n" +
+                        "$null = New-ItemProperty -Path $protocolPath -Name 'URL Protocol' -Value '' -PropertyType String -Force\n" +
+                        "Set-Item -Path $protocolPath -Value 'URL:adofai-renderer Protocol' | Out-Null\n" +
+                        "$cmdPath = \"$protocolPath\\shell\\open\\command\"\n" +
+                        "$null = New-Item -Path $cmdPath -Force\n" +
+                        $"Set-Item -Path $cmdPath -Value 'explorer.exe \"{escapedFolder}\"' | Out-Null\n" +
+                        "[Windows.UI.Notifications.ToastNotificationManager, Windows.UI.Notifications, ContentType = WindowsRuntime] | Out-Null\n" +
+                        "[Windows.Data.Xml.Dom.XmlDocument, Windows.Data, ContentType = WindowsRuntime] | Out-Null\n" +
+                        "$xml = [Windows.Data.Xml.Dom.XmlDocument]::new()\n" +
+                        $"$xml.LoadXml('{toastXml}')\n" +
+                        "[Windows.UI.Notifications.ToastNotificationManager]::CreateToastNotifier('ADOFAI Renderer').Show([Windows.UI.Notifications.ToastNotification]::new($xml))";
+                }
+                else
+                {
+                    toastXml =
+                        "<toast><visual><binding template=\"ToastGeneric\">" +
+                        $"<text>{xmlTitle}</text><text>{xmlMessage}</text>" +
+                        "</binding></visual></toast>";
+
+                    psScript =
+                        "[Windows.UI.Notifications.ToastNotificationManager, Windows.UI.Notifications, ContentType = WindowsRuntime] | Out-Null\n" +
+                        "[Windows.Data.Xml.Dom.XmlDocument, Windows.Data, ContentType = WindowsRuntime] | Out-Null\n" +
+                        "$xml = [Windows.Data.Xml.Dom.XmlDocument]::new()\n" +
+                        $"$xml.LoadXml('{toastXml}')\n" +
+                        "[Windows.UI.Notifications.ToastNotificationManager]::CreateToastNotifier('ADOFAI Renderer').Show([Windows.UI.Notifications.ToastNotification]::new($xml))";
+                }
+
+                byte[] bytes = System.Text.Encoding.Unicode.GetBytes(psScript);
+                string base64 = Convert.ToBase64String(bytes);
+
+                var startInfo = new ProcessStartInfo
+                {
+                    FileName = "powershell.exe",
+                    Arguments = $"-NoProfile -NonInteractive -ExecutionPolicy Bypass -EncodedCommand {base64}",
+                    CreateNoWindow = true,
+                    UseShellExecute = false,
+                    RedirectStandardError = true,
+                    WindowStyle = ProcessWindowStyle.Hidden
+                };
+
+                using var process = new Process();
+                process.StartInfo = startInfo;
+                process.Start();
+                process.WaitForExit(5000);
+
+                // If PowerShell exited with error, treat as failure
+                if (process.ExitCode != 0)
+                {
+                    string stderr = process.StandardError.ReadToEnd().Trim();
+                    if (!string.IsNullOrEmpty(stderr))
+                        MelonLogger.Warning($"[OSNotification] Toast failed (using fallback): {stderr}");
+                    return false;
+                }
+
+                return true;
+            }
+            catch (Exception ex)
+            {
+                MelonLogger.Warning($"[OSNotification] Toast failed (using fallback): {ex.Message}");
+                return false;
+            }
+        }
+
+        #endregion
+
+        #region Balloon via Shell_NotifyIcon
+
+        // ReSharper disable InconsistentNaming
+        private const int NIM_ADD = 0x00;
+        private const int NIM_DELETE = 0x02;
+
+        private const int NIF_MESSAGE = 0x01;
+        private const int NIF_ICON = 0x02;
+        private const int NIF_TIP = 0x04;
+        private const int NIF_INFO = 0x10;
+
+        private const int NIIF_INFO = 0x01;
+
+        private const int WM_USER = 0x0400;
+        private const int WM_TRAYICON = WM_USER + 1;
+        private const int NIN_BALLOONUSERCLICK = 0x0405;
+
+        private const int WS_OVERLAPPED = 0x00000000;
+        private const uint WM_CLOSE = 0x0010;
+        private const int TRAY_ICON_UID = 29471;
+        // ReSharper restore InconsistentNaming
+
+        [DllImport("shell32.dll", CharSet = CharSet.Unicode)]
+        private static extern bool Shell_NotifyIconW(int dwMessage, ref NotifyIconDataW lpData);
+
+        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
+        private static extern IntPtr CreateWindowExW(
+            int dwExStyle, string lpClassName, string lpWindowName,
+            int dwStyle, int x, int y, int nWidth, int nHeight,
+            IntPtr hWndParent, IntPtr hMenu, IntPtr hInstance, IntPtr lpParam);
+
+        [DllImport("user32.dll")]
+        [return: MarshalAs(UnmanagedType.Bool)]
+        private static extern bool DestroyWindow(IntPtr hWnd);
+
+        [DllImport("user32.dll")]
+        private static extern IntPtr LoadIconW(IntPtr hInstance, IntPtr lpIconName);
+
+        [DllImport("user32.dll")]
+        [return: MarshalAs(UnmanagedType.Bool)]
+        private static extern bool GetMessageW(out Msg lpMsg, IntPtr hWnd, uint wMsgFilterMin, uint wMsgFilterMax);
+
+        [DllImport("user32.dll")]
+        private static extern IntPtr TranslateMessage(ref Msg lpMsg);
+
+        [DllImport("user32.dll")]
+        private static extern IntPtr DispatchMessageW(ref Msg lpMsg);
+
+        [DllImport("user32.dll")]
+        [return: MarshalAs(UnmanagedType.Bool)]
+        private static extern bool PostMessageW(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);
+
+        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        private struct NotifyIconDataW
+        {
+            public int cbSize;
+            public IntPtr hWnd;
+            public int uID;
+            public int uFlags;
+            public int uCallbackMessage;
+            public IntPtr hIcon;
+            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
+            public string szTip;
+            public int dwState;
+            public int dwStateMask;
+            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
+            public string szInfo;
+            public int uTimeoutOrVersion;
+            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 64)]
+            public string szInfoTitle;
+            public int dwInfoFlags;
+        }
+
+        [StructLayout(LayoutKind.Sequential)]
+        private struct Msg
+        {
+            public IntPtr hwnd;
+            public uint message;
+            public IntPtr wParam;
+            public IntPtr lParam;
+            public uint time;
+            public int pt_x;
+            public int pt_y;
+        }
+
+        private static void SendBalloon(string title, string message, string? folderPath)
+        {
+            if (title.Length > 63) title = title.Substring(0, 63);
+            if (message.Length > 255) message = message.Substring(0, 255);
+
+            IntPtr hWnd = IntPtr.Zero;
+            var nid = new NotifyIconDataW();
+
+            try
+            {
+                var hwndMessage = new IntPtr(-3);
+                hWnd = CreateWindowExW(
+                    0, "Static", "ADOFAIRendererNotify",
+                    WS_OVERLAPPED, 0, 0, 0, 0,
+                    hwndMessage, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
+
+                if (hWnd == IntPtr.Zero)
+                {
+                    MelonLogger.Warning("[OSNotification] Cannot create message window.");
+                    return;
+                }
+
+                IntPtr hIcon = LoadIconW(IntPtr.Zero, (IntPtr)32512);
+
+                nid.cbSize = Marshal.SizeOf(typeof(NotifyIconDataW));
+                nid.hWnd = hWnd;
+                nid.uID = TRAY_ICON_UID;
+                nid.uFlags = NIF_MESSAGE | NIF_ICON | NIF_TIP | NIF_INFO;
+                nid.uCallbackMessage = WM_TRAYICON;
+                nid.hIcon = hIcon;
+                nid.szTip = "ADOFAI Renderer";
+                nid.szInfo = message;
+                nid.szInfoTitle = title;
+                nid.dwInfoFlags = NIIF_INFO;
+                nid.uTimeoutOrVersion = 4;
+
+                Shell_NotifyIconW(NIM_ADD, ref nid);
+
+                if (!string.IsNullOrEmpty(folderPath))
+                {
+                    var capturedFolder = folderPath;
+                    var closeTimer = new System.Threading.Timer(_ =>
+                    {
+                        try { PostMessageW(hWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero); }
+                        catch { /* ignored */ }
+                    }, null, 12000, Timeout.Infinite);
+
+                    try
+                    {
+                        while (GetMessageW(out var msg, IntPtr.Zero, 0, 0))
+                        {
+                            if (msg.message == WM_CLOSE)
+                                break;
+
+                            if (msg.message == WM_TRAYICON)
+                            {
+                                int notifyMsg = (int)(long)msg.lParam;
+                                if (notifyMsg == NIN_BALLOONUSERCLICK)
+                                {
+                                    try
+                                    {
+                                        var psi = new ProcessStartInfo();
+                                        psi.FileName = capturedFolder;
+                                        psi.UseShellExecute = true;
+                                        Process.Start(psi);
+                                    }
+                                    catch (Exception ex)
+                                    {
+                                        MelonLogger.Warning(
+                                            $"[OSNotification] Cannot open folder: {ex.Message}");
+                                    }
+
+                                    break;
+                                }
+                            }
+
+                            TranslateMessage(ref msg);
+                            DispatchMessageW(ref msg);
+                        }
+                    }
+                    finally
+                    {
+                        closeTimer.Dispose();
+                    }
+                }
+                else
+                {
+                    Thread.Sleep(500);
+                }
+            }
+            catch (Exception ex)
+            {
+                MelonLogger.Warning($"[OSNotification] Balloon notification failed: {ex.Message}");
+            }
+            finally
+            {
+                if (hWnd != IntPtr.Zero)
+                {
+                    nid.uFlags = 0;
+                    Shell_NotifyIconW(NIM_DELETE, ref nid);
+                    DestroyWindow(hWnd);
+                }
+            }
+        }
+
+        #endregion
+    }
+
+    #endregion
+
+    #region macOS — osascript
+
+    /// <summary>
+    /// macOS notification using <c>osascript -e 'display notification ...'</c>.
+    /// </summary>
+    private static class MacNotification
+    {
+        public static void Send(string title, string message)
+        {
+            // AppleScript string escaping: backslash and double-quote
+            string escapedTitle = EscapeAppleScript(title);
+            string escapedMessage = EscapeAppleScript(message);
+
+            // Use ProcessStartInfo with ArgumentList to avoid shell-level escaping issues.
+            // Each argument is passed directly to the process without shell interpretation.
+            var script =
+                $"display notification \"{escapedMessage}\" with title \"{escapedTitle}\"";
+
+            var startInfo = new ProcessStartInfo
+            {
+                FileName = "osascript",
+                CreateNoWindow = true,
+                UseShellExecute = false,
+                WindowStyle = ProcessWindowStyle.Hidden
+            };
+            startInfo.ArgumentList.Add("-e");
+            startInfo.ArgumentList.Add(script);
+
+            RunProcess(startInfo);
+        }
+
+        private static string EscapeAppleScript(string value)
+        {
+            // In AppleScript string literals, escape backslash and double-quote
+            return value
+                .Replace("\\", "\\\\")
+                .Replace("\"", "\\\"");
+        }
+    }
+
+    #endregion
+
+    #region Linux — notify-send / gdbus
+
+    /// <summary>
+    /// Linux notification using <c>notify-send</c> (libnotify CLI).
+    /// Falls back to <c>gdbus</c> (D-Bus direct call) if notify-send is unavailable.
+    /// </summary>
+    private static class LinuxNotification
+    {
+        public static void Send(string title, string message, string? folderPath)
+        {
+            if (!string.IsNullOrEmpty(folderPath))
+            {
+                ShowWithAction(title, message, folderPath);
+            }
+            else
+            {
+                ShowSimple(title, message);
+            }
+        }
+
+        private static void ShowSimple(string title, string message)
+        {
+            // Try notify-send first
+            if (TryNotifySend(title, message))
+                return;
+
+            // Fallback to gdbus
+            TryGdbus(title, message);
+        }
+
+        private static void ShowWithAction(string title, string message, string folderPath)
+        {
+            // Run on a background thread because notify-send with --action blocks
+            // until the notification is dismissed or the action is clicked.
+            System.Threading.Tasks.Task.Run(() =>
+            {
+                try
+                {
+                    var startInfo = new ProcessStartInfo
+                    {
+                        FileName = "notify-send",
+                        CreateNoWindow = true,
+                        UseShellExecute = false,
+                        RedirectStandardOutput = true,
+                        WindowStyle = ProcessWindowStyle.Hidden
+                    };
+                    startInfo.ArgumentList.Add("-a");
+                    startInfo.ArgumentList.Add("ADOFAI Renderer");
+                    startInfo.ArgumentList.Add("--action=open_folder=Open Render Folder");
+                    startInfo.ArgumentList.Add(title);
+                    startInfo.ArgumentList.Add(message);
+
+                    using var process = new Process();
+                    process.StartInfo = startInfo;
+                    process.Start();
+                    string output = process.StandardOutput.ReadToEnd().Trim();
+                    process.WaitForExit();
+
+                    if (output == "open_folder")
+                    {
+                        var openInfo = new ProcessStartInfo
+                        {
+                            FileName = "xdg-open",
+                            CreateNoWindow = true,
+                            UseShellExecute = false,
+                            WindowStyle = ProcessWindowStyle.Hidden
+                        };
+                        openInfo.ArgumentList.Add(folderPath);
+
+                        RunProcess(openInfo);
+                    }
+                }
+                catch (Exception ex)
+                {
+                    MelonLogger.Warning($"[OSNotification] Linux notification processing failed: {ex.Message}");
+
+                    // Fallback: show without action
+                    ShowSimple(title, message);
+                }
+            });
+        }
+
+        private static bool TryNotifySend(string title, string message)
+        {
+            try
+            {
+                var startInfo = new ProcessStartInfo
+                {
+                    FileName = "notify-send",
+                    CreateNoWindow = true,
+                    UseShellExecute = false,
+                    WindowStyle = ProcessWindowStyle.Hidden
+                };
+                startInfo.ArgumentList.Add("-a");
+                startInfo.ArgumentList.Add("ADOFAI Renderer");
+                startInfo.ArgumentList.Add(title);
+                startInfo.ArgumentList.Add(message);
+
+                RunProcess(startInfo);
+                return true;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        private static void TryGdbus(string title, string message)
+        {
+            try
+            {
+                // Direct D-Bus call to org.freedesktop.Notifications
+                var startInfo = new ProcessStartInfo
+                {
+                    FileName = "gdbus",
+                    CreateNoWindow = true,
+                    UseShellExecute = false,
+                    WindowStyle = ProcessWindowStyle.Hidden
+                };
+                startInfo.ArgumentList.Add("call");
+                startInfo.ArgumentList.Add("--session");
+                startInfo.ArgumentList.Add("--dest=org.freedesktop.Notifications");
+                startInfo.ArgumentList.Add("--object-path=/org/freedesktop/Notifications");
+                startInfo.ArgumentList.Add("--method=org.freedesktop.Notifications.Notify");
+                startInfo.ArgumentList.Add("ADOFAI Renderer"); // app_name
+                startInfo.ArgumentList.Add("0");                // replaces_id
+                startInfo.ArgumentList.Add("");                 // app_icon
+                startInfo.ArgumentList.Add(title);              // summary
+                startInfo.ArgumentList.Add(message);            // body
+                startInfo.ArgumentList.Add("[]");               // actions
+                startInfo.ArgumentList.Add("{}");               // hints
+                startInfo.ArgumentList.Add("-1");               // expire_timeout
+
+                RunProcess(startInfo);
+            }
+            catch (Exception ex)
+            {
+                MelonLogger.Warning($"[OSNotification] gdbus notification failed: {ex.Message}");
+            }
+        }
+    }
+
+    #endregion
+
+    #region Shared utility
+
+    /// <summary>
+    /// Starts a process fire-and-forget. Does not redirect output or wait for exit.
+    /// </summary>
+    private static void RunProcess(ProcessStartInfo startInfo)
+    {
+        using var process = new Process();
+        process.StartInfo = startInfo;
+        process.Start();
+    }
+
+    #endregion
+}

Util/OS/RegistryUtil.cs

@@ -0,0 +1,129 @@
+using System;
+
+namespace ADOFAIRenderer.Util.OS;
+
+internal static class RegistryUtil
+{
+    private static readonly Type? RegistryKeyType;
+    private static readonly Type? RegistryHiveType;
+    private static readonly Type? RegistryViewType;
+    private static readonly System.Reflection.MethodInfo? OpenBaseKeyMethod;
+    private static readonly System.Reflection.MethodInfo? OpenSubKeyMethod;
+    private static readonly System.Reflection.MethodInfo? GetSubKeyNamesMethod;
+    private static readonly System.Reflection.MethodInfo? GetValueMethod;
+
+    static RegistryUtil()
+    {
+        try
+        {
+            RegistryKeyType = Type.GetType("Microsoft.Win32.RegistryKey");
+            RegistryHiveType = Type.GetType("Microsoft.Win32.RegistryHive");
+            RegistryViewType = Type.GetType("Microsoft.Win32.RegistryView");
+
+            if (RegistryKeyType == null || RegistryHiveType == null || RegistryViewType == null)
+            {
+                var mscorlib = typeof(object).Assembly;
+                RegistryKeyType = mscorlib.GetType("Microsoft.Win32.RegistryKey");
+                RegistryHiveType = mscorlib.GetType("Microsoft.Win32.RegistryHive");
+                RegistryViewType = mscorlib.GetType("Microsoft.Win32.RegistryView");
+            }
+
+            if (RegistryKeyType != null)
+            {
+                OpenBaseKeyMethod = RegistryKeyType.GetMethod("OpenBaseKey", new[] { RegistryHiveType!, RegistryViewType! });
+                OpenSubKeyMethod = RegistryKeyType.GetMethod("OpenSubKey", new[] { typeof(string) });
+                GetSubKeyNamesMethod = RegistryKeyType.GetMethod("GetSubKeyNames");
+                GetValueMethod = RegistryKeyType.GetMethod("GetValue", new[] { typeof(string) });
+            }
+        }
+        catch
+        {
+            // ignored
+        }
+    }
+
+    private static void CloseKey(object? key)
+    {
+        if (key == null || RegistryKeyType == null) return;
+        try
+        {
+            if (key is IDisposable disposable)
+            {
+                disposable.Dispose();
+            }
+            else
+            {
+                var closeMethod = RegistryKeyType.GetMethod("Close");
+                closeMethod?.Invoke(key, null);
+            }
+        }
+        catch
+        {
+            // ignored
+        }
+    }
+
+    // ReSharper disable once InconsistentNaming
+    public static string[]? GetHKLMSubKeyNames(string parentKeyPath)
+    {
+        if (RegistryKeyType == null || OpenBaseKeyMethod == null || OpenSubKeyMethod == null || GetSubKeyNamesMethod == null)
+            return null;
+
+        try
+        {
+            object hiveLocalMachine = Enum.ToObject(RegistryHiveType!, 0x80000002);
+            object viewRegistry64 = Enum.ToObject(RegistryViewType!, 256);
+
+            object? baseKey = OpenBaseKeyMethod.Invoke(null, new[] { hiveLocalMachine, viewRegistry64 });
+            if (baseKey == null) return null;
+
+            object? key = OpenSubKeyMethod.Invoke(baseKey, new object[] { parentKeyPath });
+            if (key == null)
+            {
+                CloseKey(baseKey);
+                return null;
+            }
+
+            string[]? subkeyNames = GetSubKeyNamesMethod.Invoke(key, null) as string[];
+            CloseKey(key);
+            CloseKey(baseKey);
+            return subkeyNames;
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    // ReSharper disable once InconsistentNaming
+    public static string? GetHKLMValue(string keyPath, string valueName)
+    {
+        if (RegistryKeyType == null || OpenBaseKeyMethod == null || OpenSubKeyMethod == null || GetValueMethod == null)
+            return null;
+
+        try
+        {
+            object hiveLocalMachine = Enum.ToObject(RegistryHiveType!, 0x80000002);
+            object viewRegistry64 = Enum.ToObject(RegistryViewType!, 256);
+
+            object? baseKey = OpenBaseKeyMethod.Invoke(null, new[] { hiveLocalMachine, viewRegistry64 });
+            if (baseKey == null) return null;
+
+            object? key = OpenSubKeyMethod.Invoke(baseKey, new object[] { keyPath });
+            if (key == null)
+            {
+                CloseKey(baseKey);
+                return null;
+            }
+
+            string? value = GetValueMethod.Invoke(key, new object[] { valueName }) as string;
+            CloseKey(key);
+            CloseKey(baseKey);
+            return value;
+        }
+        catch
+        {
+            return null;
+        }
+    }
+}

Util/OSNotification.cs

@@ -1,578 +0,0 @@
-using System;
-using System.Diagnostics;
-using System.Runtime.InteropServices;
-using System.Threading;
-using MelonLoader;
-
-namespace ADOFAIRenderer.Util
-{
-    /// <summary>
-    /// Sends native desktop notifications on Windows, macOS, and Linux.
-    /// <para>
-    /// - <b>Windows</b>: Uses Win32 <c>Shell_NotifyIcon</c> (system tray balloon) via P/Invoke.
-    ///   No PowerShell, no UWP, no WinRT dependencies.
-    /// </para>
-    /// <para>
-    /// - <b>macOS</b>: Uses <c>osascript</c> with AppleScript's <c>display notification</c>.
-    /// </para>
-    /// <para>
-    /// - <b>Linux</b>: Uses <c>notify-send</c> (libnotify) with <c>xdg-open</c> for folder actions.
-    /// </para>
-    /// </summary>
-    internal static class OSNotification
-    {
-        /// <summary>
-        /// Sends a native desktop notification.
-        /// If <paramref name="folderPath"/> is provided, Windows and Linux will attempt to open
-        /// the folder when the notification is clicked/dismissed.
-        /// </summary>
-        /// <param name="title">The notification title.</param>
-        /// <param name="message">The notification body text.</param>
-        /// <param name="folderPath">Optional folder path to open on click (Windows balloon click / Linux action).</param>
-        public static void Show(string title, string message, string? folderPath = null)
-        {
-            try
-            {
-                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
-                {
-                    WindowsNotification.Send(title, message, folderPath);
-                }
-                else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
-                {
-                    MacNotification.Send(title, message);
-                }
-                else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
-                {
-                    LinuxNotification.Send(title, message, folderPath);
-                }
-            }
-            catch (Exception ex)
-            {
-                MelonLogger.Warning($"[OSNotification] Failed to send notification: {ex.Message}");
-            }
-        }
-
-        #region Windows — Toast (primary) + Shell_NotifyIcon (fallback)
-
-        /// <summary>
-        /// Windows notification with two strategies:
-        /// <para>1. <b>Toast</b> via PowerShell — persists in Action Center.</para>
-        /// <para>2. <b>Shell_NotifyIcon balloon</b> via P/Invoke — fallback if toast fails.</para>
-        /// </summary>
-        private static class WindowsNotification
-        {
-            public static void Send(string title, string message, string? folderPath)
-            {
-                var thread = new Thread(() =>
-                {
-                    try
-                    {
-                        if (!TrySendToast(title, message, folderPath))
-                        {
-                            SendBalloon(title, message, folderPath);
-                        }
-                    }
-                    catch (Exception ex)
-                    {
-                        MelonLogger.Warning($"[OSNotification] Windows notification failed: {ex.Message}");
-                    }
-                })
-                {
-                    IsBackground = true,
-                    Name = "OSNotification-Win"
-                };
-                thread.Start();
-            }
-
-            #region Toast via PowerShell
-
-            /// <summary>
-            /// Attempts to show a Windows Toast notification via PowerShell.
-            /// Returns true if the process launched successfully, false otherwise.
-            /// </summary>
-            private static bool TrySendToast(string title, string message, string? folderPath)
-            {
-                try
-                {
-                    string xmlTitle = System.Security.SecurityElement.Escape(title) ?? title;
-                    string xmlMessage = System.Security.SecurityElement.Escape(message) ?? message;
-
-                    string toastXml;
-                    string psScript;
-
-                    if (!string.IsNullOrEmpty(folderPath))
-                    {
-                        var escapedFolder = folderPath.Replace("'", "''");
-
-                        toastXml =
-                            "<toast launch=\"adofai-renderer://\" activationType=\"protocol\">" +
-                            "<visual><binding template=\"ToastGeneric\">" +
-                            $"<text>{xmlTitle}</text><text>{xmlMessage}</text>" +
-                            "</binding></visual>" +
-                            "<actions>" +
-                            "<action content=\"Open Render Folder\" arguments=\"adofai-renderer://\" activationType=\"protocol\"/>" +
-                            "</actions></toast>";
-
-                        psScript =
-                            "$protocolPath = 'HKCU:\\Software\\Classes\\adofai-renderer'\n" +
-                            "$null = New-Item -Path $protocolPath -Force\n" +
-                            "$null = New-ItemProperty -Path $protocolPath -Name 'URL Protocol' -Value '' -PropertyType String -Force\n" +
-                            "Set-Item -Path $protocolPath -Value 'URL:adofai-renderer Protocol' | Out-Null\n" +
-                            "$cmdPath = \"$protocolPath\\shell\\open\\command\"\n" +
-                            "$null = New-Item -Path $cmdPath -Force\n" +
-                            $"Set-Item -Path $cmdPath -Value 'explorer.exe \"{escapedFolder}\"' | Out-Null\n" +
-                            "[Windows.UI.Notifications.ToastNotificationManager, Windows.UI.Notifications, ContentType = WindowsRuntime] | Out-Null\n" +
-                            "[Windows.Data.Xml.Dom.XmlDocument, Windows.Data, ContentType = WindowsRuntime] | Out-Null\n" +
-                            "$xml = [Windows.Data.Xml.Dom.XmlDocument]::new()\n" +
-                            $"$xml.LoadXml('{toastXml}')\n" +
-                            "[Windows.UI.Notifications.ToastNotificationManager]::CreateToastNotifier('ADOFAI Renderer').Show([Windows.UI.Notifications.ToastNotification]::new($xml))";
-                    }
-                    else
-                    {
-                        toastXml =
-                            "<toast><visual><binding template=\"ToastGeneric\">" +
-                            $"<text>{xmlTitle}</text><text>{xmlMessage}</text>" +
-                            "</binding></visual></toast>";
-
-                        psScript =
-                            "[Windows.UI.Notifications.ToastNotificationManager, Windows.UI.Notifications, ContentType = WindowsRuntime] | Out-Null\n" +
-                            "[Windows.Data.Xml.Dom.XmlDocument, Windows.Data, ContentType = WindowsRuntime] | Out-Null\n" +
-                            "$xml = [Windows.Data.Xml.Dom.XmlDocument]::new()\n" +
-                            $"$xml.LoadXml('{toastXml}')\n" +
-                            "[Windows.UI.Notifications.ToastNotificationManager]::CreateToastNotifier('ADOFAI Renderer').Show([Windows.UI.Notifications.ToastNotification]::new($xml))";
-                    }
-
-                    byte[] bytes = System.Text.Encoding.Unicode.GetBytes(psScript);
-                    string base64 = Convert.ToBase64String(bytes);
-
-                    var startInfo = new ProcessStartInfo
-                    {
-                        FileName = "powershell.exe",
-                        Arguments = $"-NoProfile -NonInteractive -ExecutionPolicy Bypass -EncodedCommand {base64}",
-                        CreateNoWindow = true,
-                        UseShellExecute = false,
-                        RedirectStandardError = true,
-                        WindowStyle = ProcessWindowStyle.Hidden
-                    };
-
-                    using var process = new Process();
-                    process.StartInfo = startInfo;
-                    process.Start();
-                    process.WaitForExit(5000);
-
-                    // If PowerShell exited with error, treat as failure
-                    if (process.ExitCode != 0)
-                    {
-                        string stderr = process.StandardError.ReadToEnd().Trim();
-                        if (!string.IsNullOrEmpty(stderr))
-                            MelonLogger.Warning($"[OSNotification] Toast failed (using fallback): {stderr}");
-                        return false;
-                    }
-
-                    return true;
-                }
-                catch (Exception ex)
-                {
-                    MelonLogger.Warning($"[OSNotification] Toast failed (using fallback): {ex.Message}");
-                    return false;
-                }
-            }
-
-            #endregion
-
-            #region Balloon via Shell_NotifyIcon
-
-            // ReSharper disable InconsistentNaming
-            private const int NIM_ADD = 0x00;
-            private const int NIM_DELETE = 0x02;
-
-            private const int NIF_MESSAGE = 0x01;
-            private const int NIF_ICON = 0x02;
-            private const int NIF_TIP = 0x04;
-            private const int NIF_INFO = 0x10;
-
-            private const int NIIF_INFO = 0x01;
-
-            private const int WM_USER = 0x0400;
-            private const int WM_TRAYICON = WM_USER + 1;
-            private const int NIN_BALLOONUSERCLICK = 0x0405;
-
-            private const int WS_OVERLAPPED = 0x00000000;
-            private const uint WM_CLOSE = 0x0010;
-            private const int TRAY_ICON_UID = 29471;
-            // ReSharper restore InconsistentNaming
-
-            [DllImport("shell32.dll", CharSet = CharSet.Unicode)]
-            private static extern bool Shell_NotifyIconW(int dwMessage, ref NotifyIconDataW lpData);
-
-            [DllImport("user32.dll", CharSet = CharSet.Unicode)]
-            private static extern IntPtr CreateWindowExW(
-                int dwExStyle, string lpClassName, string lpWindowName,
-                int dwStyle, int x, int y, int nWidth, int nHeight,
-                IntPtr hWndParent, IntPtr hMenu, IntPtr hInstance, IntPtr lpParam);
-
-            [DllImport("user32.dll")]
-            [return: MarshalAs(UnmanagedType.Bool)]
-            private static extern bool DestroyWindow(IntPtr hWnd);
-
-            [DllImport("user32.dll")]
-            private static extern IntPtr LoadIconW(IntPtr hInstance, IntPtr lpIconName);
-
-            [DllImport("user32.dll")]
-            [return: MarshalAs(UnmanagedType.Bool)]
-            private static extern bool GetMessageW(out Msg lpMsg, IntPtr hWnd, uint wMsgFilterMin, uint wMsgFilterMax);
-
-            [DllImport("user32.dll")]
-            private static extern IntPtr TranslateMessage(ref Msg lpMsg);
-
-            [DllImport("user32.dll")]
-            private static extern IntPtr DispatchMessageW(ref Msg lpMsg);
-
-            [DllImport("user32.dll")]
-            [return: MarshalAs(UnmanagedType.Bool)]
-            private static extern bool PostMessageW(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);
-
-            [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
-            private struct NotifyIconDataW
-            {
-                public int cbSize;
-                public IntPtr hWnd;
-                public int uID;
-                public int uFlags;
-                public int uCallbackMessage;
-                public IntPtr hIcon;
-                [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
-                public string szTip;
-                public int dwState;
-                public int dwStateMask;
-                [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
-                public string szInfo;
-                public int uTimeoutOrVersion;
-                [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 64)]
-                public string szInfoTitle;
-                public int dwInfoFlags;
-            }
-
-            [StructLayout(LayoutKind.Sequential)]
-            private struct Msg
-            {
-                public IntPtr hwnd;
-                public uint message;
-                public IntPtr wParam;
-                public IntPtr lParam;
-                public uint time;
-                public int pt_x;
-                public int pt_y;
-            }
-
-            private static void SendBalloon(string title, string message, string? folderPath)
-            {
-                if (title.Length > 63) title = title.Substring(0, 63);
-                if (message.Length > 255) message = message.Substring(0, 255);
-
-                IntPtr hWnd = IntPtr.Zero;
-                var nid = new NotifyIconDataW();
-
-                try
-                {
-                    var hwndMessage = new IntPtr(-3);
-                    hWnd = CreateWindowExW(
-                        0, "Static", "ADOFAIRendererNotify",
-                        WS_OVERLAPPED, 0, 0, 0, 0,
-                        hwndMessage, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
-
-                    if (hWnd == IntPtr.Zero)
-                    {
-                        MelonLogger.Warning("[OSNotification] Cannot create message window.");
-                        return;
-                    }
-
-                    IntPtr hIcon = LoadIconW(IntPtr.Zero, (IntPtr)32512);
-
-                    nid.cbSize = Marshal.SizeOf(typeof(NotifyIconDataW));
-                    nid.hWnd = hWnd;
-                    nid.uID = TRAY_ICON_UID;
-                    nid.uFlags = NIF_MESSAGE | NIF_ICON | NIF_TIP | NIF_INFO;
-                    nid.uCallbackMessage = WM_TRAYICON;
-                    nid.hIcon = hIcon;
-                    nid.szTip = "ADOFAI Renderer";
-                    nid.szInfo = message;
-                    nid.szInfoTitle = title;
-                    nid.dwInfoFlags = NIIF_INFO;
-                    nid.uTimeoutOrVersion = 4;
-
-                    Shell_NotifyIconW(NIM_ADD, ref nid);
-
-                    if (!string.IsNullOrEmpty(folderPath))
-                    {
-                        var capturedFolder = folderPath;
-                        var closeTimer = new System.Threading.Timer(_ =>
-                        {
-                            try { PostMessageW(hWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero); }
-                            catch { /* ignored */ }
-                        }, null, 12000, Timeout.Infinite);
-
-                        try
-                        {
-                            while (GetMessageW(out var msg, IntPtr.Zero, 0, 0))
-                            {
-                                if (msg.message == WM_CLOSE)
-                                    break;
-
-                                if (msg.message == WM_TRAYICON)
-                                {
-                                    int notifyMsg = (int)(long)msg.lParam;
-                                    if (notifyMsg == NIN_BALLOONUSERCLICK)
-                                    {
-                                        try
-                                        {
-                                            var psi = new ProcessStartInfo();
-                                            psi.FileName = capturedFolder;
-                                            psi.UseShellExecute = true;
-                                            Process.Start(psi);
-                                        }
-                                        catch (Exception ex)
-                                        {
-                                            MelonLogger.Warning(
-                                                $"[OSNotification] Cannot open folder: {ex.Message}");
-                                        }
-
-                                        break;
-                                    }
-                                }
-
-                                TranslateMessage(ref msg);
-                                DispatchMessageW(ref msg);
-                            }
-                        }
-                        finally
-                        {
-                            closeTimer.Dispose();
-                        }
-                    }
-                    else
-                    {
-                        Thread.Sleep(500);
-                    }
-                }
-                catch (Exception ex)
-                {
-                    MelonLogger.Warning($"[OSNotification] Balloon notification failed: {ex.Message}");
-                }
-                finally
-                {
-                    if (hWnd != IntPtr.Zero)
-                    {
-                        nid.uFlags = 0;
-                        Shell_NotifyIconW(NIM_DELETE, ref nid);
-                        DestroyWindow(hWnd);
-                    }
-                }
-            }
-
-            #endregion
-        }
-
-        #endregion
-
-        #region macOS — osascript
-
-        /// <summary>
-        /// macOS notification using <c>osascript -e 'display notification ...'</c>.
-        /// </summary>
-        private static class MacNotification
-        {
-            public static void Send(string title, string message)
-            {
-                // AppleScript string escaping: backslash and double-quote
-                string escapedTitle = EscapeAppleScript(title);
-                string escapedMessage = EscapeAppleScript(message);
-
-                // Use ProcessStartInfo with ArgumentList to avoid shell-level escaping issues.
-                // Each argument is passed directly to the process without shell interpretation.
-                var script =
-                    $"display notification \"{escapedMessage}\" with title \"{escapedTitle}\"";
-
-                var startInfo = new ProcessStartInfo
-                {
-                    FileName = "osascript",
-                    CreateNoWindow = true,
-                    UseShellExecute = false,
-                    WindowStyle = ProcessWindowStyle.Hidden
-                };
-                startInfo.ArgumentList.Add("-e");
-                startInfo.ArgumentList.Add(script);
-
-                RunProcess(startInfo);
-            }
-
-            private static string EscapeAppleScript(string value)
-            {
-                // In AppleScript string literals, escape backslash and double-quote
-                return value
-                    .Replace("\\", "\\\\")
-                    .Replace("\"", "\\\"");
-            }
-        }
-
-        #endregion
-
-        #region Linux — notify-send / gdbus
-
-        /// <summary>
-        /// Linux notification using <c>notify-send</c> (libnotify CLI).
-        /// Falls back to <c>gdbus</c> (D-Bus direct call) if notify-send is unavailable.
-        /// </summary>
-        private static class LinuxNotification
-        {
-            public static void Send(string title, string message, string? folderPath)
-            {
-                if (!string.IsNullOrEmpty(folderPath))
-                {
-                    ShowWithAction(title, message, folderPath);
-                }
-                else
-                {
-                    ShowSimple(title, message);
-                }
-            }
-
-            private static void ShowSimple(string title, string message)
-            {
-                // Try notify-send first
-                if (TryNotifySend(title, message))
-                    return;
-
-                // Fallback to gdbus
-                TryGdbus(title, message);
-            }
-
-            private static void ShowWithAction(string title, string message, string folderPath)
-            {
-                // Run on a background thread because notify-send with --action blocks
-                // until the notification is dismissed or the action is clicked.
-                System.Threading.Tasks.Task.Run(() =>
-                {
-                    try
-                    {
-                        var startInfo = new ProcessStartInfo
-                        {
-                            FileName = "notify-send",
-                            CreateNoWindow = true,
-                            UseShellExecute = false,
-                            RedirectStandardOutput = true,
-                            WindowStyle = ProcessWindowStyle.Hidden
-                        };
-                        startInfo.ArgumentList.Add("-a");
-                        startInfo.ArgumentList.Add("ADOFAI Renderer");
-                        startInfo.ArgumentList.Add("--action=open_folder=Open Render Folder");
-                        startInfo.ArgumentList.Add(title);
-                        startInfo.ArgumentList.Add(message);
-
-                        using var process = new Process();
-                        process.StartInfo = startInfo;
-                        process.Start();
-                        string output = process.StandardOutput.ReadToEnd().Trim();
-                        process.WaitForExit();
-
-                        if (output == "open_folder")
-                        {
-                            var openInfo = new ProcessStartInfo
-                            {
-                                FileName = "xdg-open",
-                                CreateNoWindow = true,
-                                UseShellExecute = false,
-                                WindowStyle = ProcessWindowStyle.Hidden
-                            };
-                            openInfo.ArgumentList.Add(folderPath);
-
-                            RunProcess(openInfo);
-                        }
-                    }
-                    catch (Exception ex)
-                    {
-                        MelonLogger.Warning($"[OSNotification] Linux notification processing failed: {ex.Message}");
-
-                        // Fallback: show without action
-                        ShowSimple(title, message);
-                    }
-                });
-            }
-
-            private static bool TryNotifySend(string title, string message)
-            {
-                try
-                {
-                    var startInfo = new ProcessStartInfo
-                    {
-                        FileName = "notify-send",
-                        CreateNoWindow = true,
-                        UseShellExecute = false,
-                        WindowStyle = ProcessWindowStyle.Hidden
-                    };
-                    startInfo.ArgumentList.Add("-a");
-                    startInfo.ArgumentList.Add("ADOFAI Renderer");
-                    startInfo.ArgumentList.Add(title);
-                    startInfo.ArgumentList.Add(message);
-
-                    RunProcess(startInfo);
-                    return true;
-                }
-                catch
-                {
-                    return false;
-                }
-            }
-
-            private static void TryGdbus(string title, string message)
-            {
-                try
-                {
-                    // Direct D-Bus call to org.freedesktop.Notifications
-                    var startInfo = new ProcessStartInfo
-                    {
-                        FileName = "gdbus",
-                        CreateNoWindow = true,
-                        UseShellExecute = false,
-                        WindowStyle = ProcessWindowStyle.Hidden
-                    };
-                    startInfo.ArgumentList.Add("call");
-                    startInfo.ArgumentList.Add("--session");
-                    startInfo.ArgumentList.Add("--dest=org.freedesktop.Notifications");
-                    startInfo.ArgumentList.Add("--object-path=/org/freedesktop/Notifications");
-                    startInfo.ArgumentList.Add("--method=org.freedesktop.Notifications.Notify");
-                    startInfo.ArgumentList.Add("ADOFAI Renderer"); // app_name
-                    startInfo.ArgumentList.Add("0");                // replaces_id
-                    startInfo.ArgumentList.Add("");                 // app_icon
-                    startInfo.ArgumentList.Add(title);              // summary
-                    startInfo.ArgumentList.Add(message);            // body
-                    startInfo.ArgumentList.Add("[]");               // actions
-                    startInfo.ArgumentList.Add("{}");               // hints
-                    startInfo.ArgumentList.Add("-1");               // expire_timeout
-
-                    RunProcess(startInfo);
-                }
-                catch (Exception ex)
-                {
-                    MelonLogger.Warning($"[OSNotification] gdbus notification failed: {ex.Message}");
-                }
-            }
-        }
-
-        #endregion
-
-        #region Shared utility
-
-        /// <summary>
-        /// Starts a process fire-and-forget. Does not redirect output or wait for exit.
-        /// </summary>
-        private static void RunProcess(ProcessStartInfo startInfo)
-        {
-            using var process = new Process();
-            process.StartInfo = startInfo;
-            process.Start();
-        }
-
-        #endregion
-    }
-}

Util/RegistryUtil.cs

@@ -1,130 +0,0 @@
-using System;
-
-namespace ADOFAIRenderer.Util
-{
-    internal static class RegistryUtil
-    {
-        private static readonly Type? RegistryKeyType;
-        private static readonly Type? RegistryHiveType;
-        private static readonly Type? RegistryViewType;
-        private static readonly System.Reflection.MethodInfo? OpenBaseKeyMethod;
-        private static readonly System.Reflection.MethodInfo? OpenSubKeyMethod;
-        private static readonly System.Reflection.MethodInfo? GetSubKeyNamesMethod;
-        private static readonly System.Reflection.MethodInfo? GetValueMethod;
-
-        static RegistryUtil()
-        {
-            try
-            {
-                RegistryKeyType = Type.GetType("Microsoft.Win32.RegistryKey");
-                RegistryHiveType = Type.GetType("Microsoft.Win32.RegistryHive");
-                RegistryViewType = Type.GetType("Microsoft.Win32.RegistryView");
-
-                if (RegistryKeyType == null || RegistryHiveType == null || RegistryViewType == null)
-                {
-                    var mscorlib = typeof(object).Assembly;
-                    RegistryKeyType = mscorlib.GetType("Microsoft.Win32.RegistryKey");
-                    RegistryHiveType = mscorlib.GetType("Microsoft.Win32.RegistryHive");
-                    RegistryViewType = mscorlib.GetType("Microsoft.Win32.RegistryView");
-                }
-
-                if (RegistryKeyType != null)
-                {
-                    OpenBaseKeyMethod = RegistryKeyType.GetMethod("OpenBaseKey", new[] { RegistryHiveType!, RegistryViewType! });
-                    OpenSubKeyMethod = RegistryKeyType.GetMethod("OpenSubKey", new[] { typeof(string) });
-                    GetSubKeyNamesMethod = RegistryKeyType.GetMethod("GetSubKeyNames");
-                    GetValueMethod = RegistryKeyType.GetMethod("GetValue", new[] { typeof(string) });
-                }
-            }
-            catch
-            {
-                // ignored
-            }
-        }
-
-        private static void CloseKey(object? key)
-        {
-            if (key == null || RegistryKeyType == null) return;
-            try
-            {
-                if (key is IDisposable disposable)
-                {
-                    disposable.Dispose();
-                }
-                else
-                {
-                    var closeMethod = RegistryKeyType.GetMethod("Close");
-                    closeMethod?.Invoke(key, null);
-                }
-            }
-            catch
-            {
-                // ignored
-            }
-        }
-
-        // ReSharper disable once InconsistentNaming
-        public static string[]? GetHKLMSubKeyNames(string parentKeyPath)
-        {
-            if (RegistryKeyType == null || OpenBaseKeyMethod == null || OpenSubKeyMethod == null || GetSubKeyNamesMethod == null)
-                return null;
-
-            try
-            {
-                object hiveLocalMachine = Enum.ToObject(RegistryHiveType!, 0x80000002);
-                object viewRegistry64 = Enum.ToObject(RegistryViewType!, 256);
-
-                object? baseKey = OpenBaseKeyMethod.Invoke(null, new[] { hiveLocalMachine, viewRegistry64 });
-                if (baseKey == null) return null;
-
-                object? key = OpenSubKeyMethod.Invoke(baseKey, new object[] { parentKeyPath });
-                if (key == null)
-                {
-                    CloseKey(baseKey);
-                    return null;
-                }
-
-                string[]? subkeyNames = GetSubKeyNamesMethod.Invoke(key, null) as string[];
-                CloseKey(key);
-                CloseKey(baseKey);
-                return subkeyNames;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-
-        // ReSharper disable once InconsistentNaming
-        public static string? GetHKLMValue(string keyPath, string valueName)
-        {
-            if (RegistryKeyType == null || OpenBaseKeyMethod == null || OpenSubKeyMethod == null || GetValueMethod == null)
-                return null;
-
-            try
-            {
-                object hiveLocalMachine = Enum.ToObject(RegistryHiveType!, 0x80000002);
-                object viewRegistry64 = Enum.ToObject(RegistryViewType!, 256);
-
-                object? baseKey = OpenBaseKeyMethod.Invoke(null, new[] { hiveLocalMachine, viewRegistry64 });
-                if (baseKey == null) return null;
-
-                object? key = OpenSubKeyMethod.Invoke(baseKey, new object[] { keyPath });
-                if (key == null)
-                {
-                    CloseKey(baseKey);
-                    return null;
-                }
-
-                string? value = GetValueMethod.Invoke(key, new object[] { valueName }) as string;
-                CloseKey(key);
-                CloseKey(baseKey);
-                return value;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-    }
-}

Util/VideoBGPlayer.cs

@@ -20,6 +20,7 @@ internal class VideoBGPlayer : MonoBehaviour
     private static readonly int UTex = Shader.PropertyToID("_UTex");
     private static readonly int VTex = Shader.PropertyToID("_VTex");
     private static readonly int ColorRange = Shader.PropertyToID("ColorRange");
+    private static readonly int ColorMatrix = Shader.PropertyToID("ColorMatrix");
 
     [SuppressMessage("ReSharper", "InconsistentNaming")]
     private enum GPUMode
@@ -189,6 +190,14 @@ internal class VideoBGPlayer : MonoBehaviour
         var vidOffset = scrVfxPlus.instance ? scrVfxPlus.instance.vidOffset : 0.0;
         var targetVideoTime = songTime + vidOffset;
 
+        // When looping is enabled, the playback position is the elapsed time wrapped into [0, Duration).
+        // When it is disabled, the position keeps increasing and the last frame stays on screen after the end.
+        var videoDuration = _decoder.Duration;
+        if (_isLooping && targetVideoTime >= 0 && videoDuration > 0)
+        {
+            targetVideoTime %= videoDuration;
+        }
+
         if (targetVideoTime < 0)
         {
             if (_targetTexture)
@@ -307,6 +316,7 @@ internal class VideoBGPlayer : MonoBehaviour
             _computeShader.SetInt(Width, w);
             _computeShader.SetInt(Height, h);
             _computeShader.SetInt(ColorRange, _decoder.ColorRange == AVColorRange.AVCOL_RANGE_JPEG ? 1 : 0);
+            _computeShader.SetInt(ColorMatrix, _decoder.ColorMatrix);
 
             int threadGroupsX = (w + 7) / 8;
             int threadGroupsY = (h + 7) / 8;
@@ -341,6 +351,7 @@ internal class VideoBGPlayer : MonoBehaviour
             _computeShader.SetInt(Width, w);
             _computeShader.SetInt(Height, h);
             _computeShader.SetInt(ColorRange, _decoder.ColorRange == AVColorRange.AVCOL_RANGE_JPEG ? 1 : 0);
+            _computeShader.SetInt(ColorMatrix, _decoder.ColorMatrix);
 
             int threadGroupsX = (w + 7) / 8;
             int threadGroupsY = (h + 7) / 8;