[FFmpeg-trac] #7927(undetermined:reopened): 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:  madsfoto     |                    Owner:
                 Type:  defect       |                   Status:  reopened
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by madsfoto):

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


Comment:

 Replying to [comment:9 Balling]:
 > Replying to [comment:7 RytoEX]:
 > > What would be an ideal sample?  I'm willing to provide sample data for
 this.
 > But this is the point. You original file is recognized as VFR! So if
 there is a bug it is in the initial parser of the original file. And that
 is due to it 30/1.001 fps. If you used 25.000 it will not be a problem.
 >
 >
 > {{{
 > ffmpeg -i Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mkv -vf
 vfrdet -an -f null -
 >
 > }}}
 >
 > Also, wanted to ask. Is you file really transfer ITU-R BT.470-6 System
 M??

 I'm the original author :) And yes, that's what a Nikon D600 produces.
 Why? No clue.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7927#comment:10>
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