[FFmpeg-trac] #7939(undetermined:new): The concat demuxer changes a constant frame rate into variable one

FFmpeg trac at avcodec.org
Fri Jul 24 04:37:10 EEST 2020


#7939: The concat demuxer changes a constant frame rate into variable one
-------------------------------------+-------------------------------------
             Reporter:  RigacciOrg   |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:  concat       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by dprestegard):

 In case anyone is struggling, I found a workaround with the shiny new
 version of mp4box which understands prores!

 First, demux to an elementary prores stream like this

 > mp4box -raw 1 input.mov
 (you'll get a file with an apch extension etc

 Then, remux to your target frame rate like this (23.976 in my case):
 > mp4box -add demuxed.apch:fps=24000/1001 remux.mov

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Ticket URL: <https://trac.ffmpeg.org/ticket/7939#comment:3>
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