media: Change ConvertPacket() MediaLog to DVLOG in FFmpegDemuxerStream

There are cases where we could get a lot of ConvertPacket() errors
without failing the playback. Hence, use DVLOG instead of MediaLogs.
If the video plays fine we don't care about these logs. If it fails we
should get some (potentially more useful) log from the video decoder.

Also add DVLOGs in ffmpeg_h264_to_annex_b_bitstream_converter.cc for
debugging the Bug.

Bug: 921715
Change-Id: I1d684552da83c7342850dc5bb0c7b6f5d9b6b76c
Reviewed-on: https://chromium-review.googlesource.com/c/1409728
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Matthew Wolenetz <wolenetz@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623309}
2 files changed