diff --git a/Core/RenderManager.cs b/Core/RenderManager.cs
index d71a2c2..d25c6c1 100644
--- a/Core/RenderManager.cs
+++ b/Core/RenderManager.cs
@@ -88,6 +88,8 @@ namespace ADOFAIRenderer.Core
         public long wonFrame = -1;
 
         // Private Instance Fields
+        private VideoFFmpeg? _activeVideoFFmpeg;
+        private readonly List<VideoFFmpeg> _allVideoFFmpegInstances = new List<VideoFFmpeg>();
         private int _originalInputOffset;
         private GameObject? _debugMonitorObj;
         private GameObject? _escapeHandlerObj;
@@ -99,6 +101,49 @@ namespace ADOFAIRenderer.Core
             Instance = this;
         }
 
+        private void OnDestroy()
+        {
+            CleanUpActiveRender();
+        }
+
+        public void CleanUpActiveRender()
+        {
+            isRendering = isCapturing = false;
+            isRenderCancelled = true;
+
+            if (_activeVideoFFmpeg != null)
+            {
+                Melon<RenderMod>.Logger.Msg("게임 종료 또는 RenderManager 파괴 감지: FFmpeg 렌더 프로세스를 강제 종료합니다.");
+                _activeVideoFFmpeg.Kill();
+                _activeVideoFFmpeg = null;
+            }
+
+            lock (_allVideoFFmpegInstances)
+            {
+                if (_allVideoFFmpegInstances.Count > 0)
+                {
+                    Melon<RenderMod>.Logger.Msg($"게임 종료 감지: 생성된 모든 FFmpeg 프로세스({_allVideoFFmpegInstances.Count}개)를 강제 수거 및 종료합니다.");
+                    foreach (var instance in _allVideoFFmpegInstances)
+                    {
+                        try
+                        {
+                            instance.Kill();
+                        }
+                        catch
+                        {
+                            // Ignore
+                        }
+                    }
+                    _allVideoFFmpegInstances.Clear();
+                }
+            }
+
+            if (RenderThread is { IsAlive: true })
+            {
+                RenderThread.Join(200);
+            }
+        }
+
         private void Update()
         {
             if (_renderSetup && ADOBase.lm)
@@ -405,13 +450,19 @@ namespace ADOFAIRenderer.Core
 
             RenderThread = new Thread(() =>
             {
+                VideoFFmpeg? videoFFmpeg = null;
                 try
                 {
                     var effectiveVideoFps = Math.Min(videoFps, targetFps);
-                    var videoFFmpeg = new VideoFFmpeg(Configuration.RenderWidth, Configuration.RenderHeight, effectiveVideoFps, videoFps, selectedCodec);
+                    videoFFmpeg = new VideoFFmpeg(Configuration.RenderWidth, Configuration.RenderHeight, effectiveVideoFps, videoFps, selectedCodec);
                     
                     SetupCaptureDirectory();
                     
+                    _activeVideoFFmpeg = videoFFmpeg;
+                    lock (_allVideoFFmpegInstances)
+                    {
+                        _allVideoFFmpegInstances.Add(videoFFmpeg);
+                    }
                     videoFFmpeg.Start(_currentOutPath, bitrate);
 
                     while (true)
@@ -464,12 +515,35 @@ namespace ADOFAIRenderer.Core
                         Thread.Sleep(1);
                     }
 
-                    videoFFmpeg.Close();
-                    endSuccessful = true;
+                    if (isRenderCancelled)
+                    {
+                        videoFFmpeg.Kill();
+                    }
+                    else
+                    {
+                        videoFFmpeg.Close();
+                    }
+                    
+                    lock (_allVideoFFmpegInstances)
+                    {
+                        _allVideoFFmpegInstances.Remove(videoFFmpeg);
+                    }
+
+                    _activeVideoFFmpeg = null;
+                    endSuccessful = !isRenderCancelled;
                 }
                 catch (Exception ex)
                 {
                     Melon<RenderMod>.Logger.Error($"FFmpeg 렌더링 스레드 오류: {ex}");
+                    _activeVideoFFmpeg?.Kill();
+                    if (videoFFmpeg != null)
+                    {
+                        lock (_allVideoFFmpegInstances)
+                        {
+                            _allVideoFFmpegInstances.Remove(videoFFmpeg);
+                        }
+                    }
+                    _activeVideoFFmpeg = null;
                 }
             })
             {
@@ -511,6 +585,12 @@ namespace ADOFAIRenderer.Core
             {
                 Melon<RenderMod>.Logger.Error("렌더링이 실패했거나 취소되었습니다. 상태 및 리소스를 안전하게 청소합니다.");
 
+                if (_activeVideoFFmpeg != null)
+                {
+                    _activeVideoFFmpeg.Kill();
+                    _activeVideoFFmpeg = null;
+                }
+
                 // 1. 메모리 누수 방지: 큐에 렌트된 임시 프레임 버퍼 풀 반환 및 클리어
                 lock (ImageQueue)
                 {
diff --git a/RenderMod.cs b/RenderMod.cs
index c718459..37cce66 100644
--- a/RenderMod.cs
+++ b/RenderMod.cs
@@ -46,5 +46,12 @@ namespace ADOFAIRenderer
             var newModule = EventSystem.current.gameObject.AddComponent<StandaloneInputModule>();
             newModule.enabled = true;
         }
+
+        public override void OnApplicationQuit()
+        {
+            if (RenderManager.Instance == null) return;
+            Melon<RenderMod>.Logger.Msg("MelonLoader 종료 감지: RenderManager의 활성 프로세스를 강제 수거 및 종료합니다.");
+            RenderManager.Instance.CleanUpActiveRender();
+        }
     }
 }
\ No newline at end of file
diff --git a/Util/FFmpeg/FFmpegProcess.cs b/Util/FFmpeg/FFmpegProcess.cs
index 5424d45..4e3c300 100644
--- a/Util/FFmpeg/FFmpegProcess.cs
+++ b/Util/FFmpeg/FFmpegProcess.cs
@@ -6,7 +6,7 @@ using Unity.Collections;
 
 namespace ADOFAIRenderer.Util.FFmpeg
 {
-    public class FFmpegProcess
+    public class FFmpegProcess : IDisposable
     {
         public static string FFmpegPath = "";
 
@@ -47,9 +47,58 @@ namespace ADOFAIRenderer.Util.FFmpeg
         public void Close()
         {
             if (_ffmpegProcess == null || _ffmpegProcess.HasExited || _inputStream == null) return;
-            _inputStream.Flush();
-            _inputStream.Close();
-            _ffmpegProcess.WaitForExit();
+            try
+            {
+                _inputStream.Flush();
+                _inputStream.Close();
+                
+                // Allow FFmpeg to finish encoding and exit gracefully without any timeout to prevent video corruption
+                _ffmpegProcess.WaitForExit();
+            }
+            catch (Exception)
+            {
+                // Ignore any issues during termination
+            }
+            finally
+            {
+                _ffmpegProcess.Dispose();
+                _ffmpegProcess = null;
+                _inputStream = null;
+            }
+        }
+
+        public void Kill()
+        {
+            try
+            {
+                if (_ffmpegProcess != null && !_ffmpegProcess.HasExited)
+                {
+                    _ffmpegProcess.Kill();
+                }
+            }
+            catch (Exception)
+            {
+                // Ignore process already exited or access denied errors during cleanup
+            }
+            finally
+            {
+                try
+                {
+                    _inputStream?.Close();
+                }
+                catch
+                {
+                    // Ignore
+                }
+                _ffmpegProcess?.Dispose();
+                _ffmpegProcess = null;
+                _inputStream = null;
+            }
+        }
+
+        public void Dispose()
+        {
+            Kill();
         }
 
         public static byte[] RentRawBytes(int size)