[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
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             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            |
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Comment (by dojima):

 Replying to [comment:8 Carl Eugen Hoyos]:
 > One that was not created with FFmpeg, so that the issue that you are
 trying to show (I am not completely convinced that it exists) is not
 already reproducible with the input file.
 Can you be a little clearer about what you mean by this?  I'd like to help
 resolve this issue since it's annoying for me to work around, but I'm
 unsure what you need.  You can take literally take any CFR video file and
 copy it into MKV then MP4 to see this issue clearly.

 Here's a CFR MKV that ffmpeg will change to VFR after remuxing to MP4
 unless {{{-video_track_timescale 60}}} is used.

 https://github.com/haasn/interpolation-samples/raw/master/60.000.mkv
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Ticket URL: <https://trac.ffmpeg.org/ticket/7927#comment:18>
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