Bug 1035059 - Fix releasing of libav frames; r=edwin

content/media/fmp4/ffmpeg/FFmpegDataDecoder.cpp

@@ -85,7 +85,7 @@ FFmpegDataDecoder<LIBAV_VER>::Init()
   mCodecContext.get_format = ChoosePixelFormat;
 
   mCodecContext.thread_count = PR_GetNumberOfProcessors();
-  mCodecContext.thread_type = FF_THREAD_FRAME;
+  mCodecContext.thread_type = FF_THREAD_SLICE | FF_THREAD_FRAME;
   mCodecContext.thread_safe_callbacks = false;
 
   mCodecContext.extradata = mExtraData.begin();

content/media/fmp4/ffmpeg/FFmpegH264Decoder.cpp

@@ -137,7 +137,11 @@ FFmpegH264Decoder<LIBAV_VER>::AllocateBufferCb(AVCodecContext* aCodecContext,
 FFmpegH264Decoder<LIBAV_VER>::ReleaseBufferCb(AVCodecContext* aCodecContext,
                                               AVFrame* aFrame)
 {
-  reinterpret_cast<Image*>(aFrame->opaque)->Release();
+  Image* image = reinterpret_cast<Image*>(aFrame->opaque);
+  avcodec_default_release_buffer(aCodecContext, aFrame);
+  if (image) {
+    image->Release();
+  }
 }
 
 int