[FFmpeg-user] Modern ffmpeg/libvpx generates incorrect PTS for vp9 when decode

[Sagara Wijetunga]

Hi ffmpeg

I noted modern ffmpeg/libvpx generates incorrect PTS for vp9 when decode.

1. Lavf55.19.104 + libvpx-1.3.0 (Generate correct PTS values @ decode)


2. Lavf55.33.100 + libvpx-1.3.0 (Generate correct PTS values @ decode)


3. Lavc55.69.100 + libvpx-git (Generate Incorrect PTS values @ decode)

4. Lavc56.1.100 + libvpx-git (Generate Incorrect PTS values @ decode)



PTS = 0.000 (Correct)
 PTS = 0.001 (wrong)
 PTS = 0.013 (wrong)
 PTS = 0.019 (wrong)
 PTS = 0.024 (wrong)
 PTS = 0.030 (wrong)
 PTS = 0.036 (wrong)
 :
 :
PTS = 0.042 (Correct)

This is a vp9 video file with 23.98 tbr.

I use avcodec_decode_video2().

The (AVFrame->pkt_pts * video-stream-TimeBase (ie. tbn)) is used for PTS.
Best regards
Sagara