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

[FFmpeg]

#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):

 Apprently even doing ffmpeg.exe -i
 Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mkv -c copy
 cnas.h264

 ffmpeg.exe -r 29.97002997 -i
 Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mkv -c copy
 wfqaws.mp4

 will not fully fix it, since

 ffmpeg.exe -i fcwejsdvfw.mp4 -vf vfrdet -f null -

 still says

 [Parsed_vfrdet_0 @ 000002aef1294540] VFR:0.037037 (1/26) min: 0 max: 1001
 avg: 0

 because one of

 [null @ 0000024a1bbceac0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 29 >= 29
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/7927#comment:22>
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