[FFmpeg-trac] #11614(ffmpeg:new): concat demux: video from 2nd file missing in concatenated file

[FFmpeg]

#11614: concat demux: video from 2nd file missing in concatenated file
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             Reporter:  bzipitidoo      |                    Owner:  (none)
                 Type:  defect          |                   Status:  new
             Priority:  normal          |                Component:  ffmpeg
              Version:  7.1             |               Resolution:
             Keywords:  concat demuxer  |               Blocked By:
             Blocking:                  |  Reproduced by developer:  0
Analyzed by developer:  0               |
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Comment (by bzipitidoo):

 Okay, figured it out.  Changed colorspace, primaries, trc of file wp12,
 and the frame rate of file wp3.  Once everything matched, then the concat
 operation produced a file that vlc likes.  Why didn't ffmpeg throw an
 error or at least a warning that the files did not match perfectly?  I
 didn't know there was such a thing as different colorspaces and the rest,
 until I read up on it.

 ffmpeg -i wp12.mp4 -c:v mpeg4 -c:a copy -b:v 400k -vf
 colorspace=space=bt470bg:trc=bt709:primaries=bt709:iall=bt601-6-625
 wp12.mkv

 ffmpeg -i wp3.mp4 -c:v mpeg4 -c:a copy -b:v 400k -r 30 wp3.mkv
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Ticket URL: <https://trac.ffmpeg.org/ticket/11614#comment:2>
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