Fix Audio Cleanup On Render Abort

Core/RenderManager.cs

@@ -260,6 +260,8 @@ internal class RenderManager : MonoBehaviour
         ResetRenderState(success: false);
 
         AudioSpectrumGenerator.Clear();
+        // Cancels the render thread's audio waits, then releases the clip store (decoder thread, readers, chunks).
+        AudioMixer?.Dispose(); AudioMixer = null;
 
         ResetFrameHookState();
 
@@ -726,22 +728,34 @@ internal class RenderManager : MonoBehaviour
 
             endSuccessful = !IsRenderAborted;
         }
+        catch (OperationCanceledException) when (IsRenderAborted)
+        {
+            // Audio waits end with OperationCanceledException when the render is cancelled or has failed (OfflineAudioMixer.Cancel).
+            Melon<RenderMod>.Logger.Msg("Render thread stopped: the render was aborted.");
+            DisposeEncoderAfterStop(videoFFmpeg);
+        }
         catch (Exception ex)
         {
             Melon<RenderMod>.Logger.Error($"FFmpeg rendering thread error: {ex}");
 
             MarkFailed("encoder thread error. See the log for details.");
+            DisposeEncoderAfterStop(videoFFmpeg);
+        }
+    }
+
+    /// <summary>Releases the encoder after the render thread stopped early (abort or error) and removes it from the encoder list.</summary>
+    private void DisposeEncoderAfterStop(FFmpegNativeEncoder videoFFmpeg)
+    {
         try
         {
             videoFFmpeg.Dispose();
         }
         catch (Exception disposeEx)
         {
-                Melon<RenderMod>.Logger.Error($"Encoder dispose after thread error also failed: {disposeEx.Message}");
+            Melon<RenderMod>.Logger.Error($"Encoder dispose after the render thread stopped also failed: {disposeEx.Message}");
         }
         UnregisterEncoder(videoFFmpeg);
     }
-    }
 
     /// <summary>
     /// Takes frames from ImageQueue in passCount order and sends each one to the encoder, followed by the audio
@@ -873,12 +887,13 @@ internal class RenderManager : MonoBehaviour
     private void StopFFmpeg(bool success)
     {
         endRequested = true;
-        if (success) AudioMixer?.Complete();
-        else AudioMixer?.Cancel();
         if (!success)
         {
             MarkCancelled();
         }
+        // The abort state is set first: the render thread reads it when its audio wait is cancelled.
+        if (success) AudioMixer?.Complete();
+        else AudioMixer?.Cancel();
         FrameAvailableEvent.Set();
         skipPressToStart = false;
         _renderSetup = false;

Util/Audio/AudioSpectrumGenerator.cs

@@ -171,6 +171,7 @@ internal static class AudioSpectrumGenerator
         if (!_view.IsValid || !_view.Contains(frame))
         {
             source.Release(_view);
+            _view = default;
             _view = _store!.Acquire(source, frame);
             if (!_view.IsValid) return 0.0;
         }