[FFmpeg-trac] #7927(undetermined:closed): Video copy from mkv to mp4 causes variable frame rate from constant frame rate

FFmpeg trac at avcodec.org
Sun Aug 29 13:26:17 EEST 2021


#7927: Video copy from mkv to mp4 causes variable frame rate from constant frame
rate
-------------------------------------+-------------------------------------
             Reporter:  Mads         |                    Owner:  (none)
  Johansen                           |
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:  invalid
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Comment (by Balling):

 There is a special thing that should be done for AVC.

 ffmpeg -i vfr.mkv -c copy -bsf:v
 "h264_metadata=tick_rate=24000/1001:'''fixed_frame_rate_flag=1'''"
 -video_track_timescale 24000 "output.mp4"

 fixed_frame_rate_flag is creating a special flag is SPS of bitstream
 itself. Now, apparently it a very common problem. https://github.com/slhck
 /ffmpeg-normalize/issues/95
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/7927#comment:17>
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