ffmpeg reset bitstream converters on Seek

media/filters/ffmpeg_demuxer.h

Index: media/filters/ffmpeg_demuxer.h
diff --git a/media/filters/ffmpeg_demuxer.h b/media/filters/ffmpeg_demuxer.h
index 8d4c91594136c7f34b1def22ee1f25e3e8d0e184..5845a44795919a61c65bda9f4883ea83f4f9d7b8 100644
--- a/media/filters/ffmpeg_demuxer.h
+++ b/media/filters/ffmpeg_demuxer.h
@@ -113,6 +113,9 @@ class FFmpegDemuxerStream : public DemuxerStream {
   // Returns an empty string if the key is not present.
   std::string GetMetadata(const char* key) const;
 
+  // Resets any currently active bitstream converters.
+  void ResetBitstreamConverter();
+
  private:
   friend class FFmpegDemuxerTest;