diff -up QtAV-master/src/codec/video/VideoDecoderFFmpeg.cpp.omv~ QtAV-master/src/codec/video/VideoDecoderFFmpeg.cpp
--- QtAV-master/src/codec/video/VideoDecoderFFmpeg.cpp.omv~	2023-12-10 23:58:23.709436078 +0100
+++ QtAV-master/src/codec/video/VideoDecoderFFmpeg.cpp	2023-12-10 23:59:25.271184799 +0100
@@ -83,9 +83,9 @@ public:
     // flags. visualize motion vectors (MVs)
     enum MotionVectorVisFlag {
         No = 0, //default
-        PF = FF_DEBUG_VIS_MV_P_FOR,
-        BF = FF_DEBUG_VIS_MV_B_FOR,
-        BB = FF_DEBUG_VIS_MV_B_BACK
+        //PF = FF_DEBUG_VIS_MV_P_FOR,
+        //BF = FF_DEBUG_VIS_MV_B_FOR,
+        //BB = FF_DEBUG_VIS_MV_B_BACK
     };
     Q_DECLARE_FLAGS(MotionVectorVisFlags, MotionVectorVisFlag)
     enum BugFlag {
diff -up QtAV-master/src/codec/video/VideoDecoderFFmpegHW.cpp.omv~ QtAV-master/src/codec/video/VideoDecoderFFmpegHW.cpp
--- QtAV-master/src/codec/video/VideoDecoderFFmpegHW.cpp.omv~	2023-12-10 23:57:48.109003594 +0100
+++ QtAV-master/src/codec/video/VideoDecoderFFmpegHW.cpp	2023-12-10 23:57:53.203065458 +0100
@@ -113,7 +113,7 @@ static void ffmpeg_release_va_buffer(str
 bool VideoDecoderFFmpegHWPrivate::prepare()
 {
     //// From vlc begin
-    codec_ctx->thread_safe_callbacks = true; //?
+    //codec_ctx->thread_safe_callbacks = true; //?
     codec_ctx->thread_count = threads;
 #ifdef _MSC_VER
 #pragma warning(disable:4065) //vc: switch has default but no case