[FFmpeg-trac] #9124(undetermined:open): 24fps nut file converts to 24.39fps mkv?

FFmpeg trac at avcodec.org
Wed Feb 24 18:31:45 EET 2021

#9124: 24fps nut file converts to 24.39fps mkv?
             Reporter:  ltratt  |                    Owner:
                 Type:  defect  |                   Status:  open
             Priority:  normal  |                Component:  undetermined
              Version:          |               Resolution:
             Keywords:          |               Blocked By:
             Blocking:          |  Reproduced by developer:  0
Analyzed by developer:  0       |
Changes (by Balling):

 * status:  new => open


 Yeah, it is indeed a bug. If you will then '''-c copy''' that broken mkv
 to mp4 it will show:

 Frame rate mode             : Variable
 Frame rate                  : 24.000 FPS
 Minimum frame rate          : 23.634 FPS
 Maximum frame rate          : 24.390 FPS
 that '''IS''' wrong and does not happen with nut convert to mp4 '''-c
 copy''' to mkv '''-c copy''' to mp4 and happens because (as ffmpeg warns
 on mp4 '''-c copy''' to mkv ):

 [mp4 @ 0000014f82a864c0] track 1: codec frame size is not set

Ticket URL: <https://trac.ffmpeg.org/ticket/9124#comment:2>
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