[FFmpeg-trac] #8874(ffmpeg:closed): mp4 muxer indicates Variable Frame Rate

FFmpeg trac at avcodec.org
Sun Feb 28 03:17:23 EET 2021

#8874: mp4 muxer indicates Variable Frame Rate
             Reporter:  RCJetPilot   |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:  ffmpeg
              Version:  unspecified  |               Resolution:  invalid
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
Changes (by Balling):

 * status:  open => closed
 * resolution:   => invalid


 Replying to [comment:6 RCJetPilot]:
 > What is broken about the file? The file is captured by FFMPEG from a UDP
 stream to a .ts file

 Your file is VFR. You can check it with
 ffmpeg -i VariableFrameRate.ts -vf vfrdet -an -f null -

 It prints
 [Parsed_vfrdet_0 @ 000002cef4b64a40] VFR:0.997207 (357/1) min: 1501 max:
 3003 avg: 1505
 VFR value is not 0, so it is VFR.

 If you do -c copy to mp4 it will print the way it is. mkv conversion is
 broken because there are no DTS in mkv, only PTS. See #7927.

Ticket URL: <https://trac.ffmpeg.org/ticket/8874#comment:7>
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