Fix File.Delete Failure by Waiting for FFmpegProcess to Exit

Core/RenderManager.cs

@@ -601,7 +601,7 @@ namespace ADOFAIRenderer.Core
 
                 if (_activeVideoFFmpeg != null)
                 {
-                    _activeVideoFFmpeg.Kill();
+                    _activeVideoFFmpeg.Kill(16384);
                     _activeVideoFFmpeg = null;
                 }
 

Util/FFmpeg/FFmpegProcess.cs

@@ -74,13 +74,17 @@ namespace ADOFAIRenderer.Util.FFmpeg
             }
         }
 
-        public void Kill()
+        public void Kill(int timeoutMs = 0)
         {
             try
             {
                 if (_ffmpegProcess != null && !_ffmpegProcess.HasExited)
                 {
                     _ffmpegProcess.Kill();
+                    if (timeoutMs > 0)
+                    {
+                        _ffmpegProcess.WaitForExit(timeoutMs);
+                    }
                 }
             }
             catch (Exception)