[FFmpeg-trac] #5461(avformat:new): concatdec with "-auto_convert 0" fails on mp4

[FFmpeg]

#5461: concatdec with "-auto_convert 0" fails on mp4
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             Reporter:  andrey.utkin  |                    Owner:
                 Type:  defect        |                   Status:  new
             Priority:  normal        |                Component:  avformat
              Version:  git-master    |               Resolution:
             Keywords:  concat        |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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Comment (by andrey.utkin):

 Replying to [comment:2 Cigaes]:
 > Replying to [ticket:5461 andrey.utkin]:
 > > If you drop "-auto_convert 0", it works fine, too, but this incurs
 other issues in my use case and thus it's not appropriate workaround.
 > [[br]]
 > Care to elaborate? H.264 in MP4 format can not be concatenated, that is
 one of the many ways the format is braindead. You ''have'' to let concat
 automatically convert.

 As far as I understand, it should be validly concatenatable if "-x264opts
 stitchable=1" is used. This x264 option serves purpose of ensuring that
 extradata is the same for any video with given fixed encoder options.

 Also, with "-auto_convert 1" I have other errors. But that's different
 issue.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5461#comment:3>
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