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

[FFmpeg]

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

 Replying to [comment:20 Cigaes]:
 > Profile, don't speculate.
 >
 > H.264-in-MP4 is braindead, this is the reason it is not supported for
 any advanced feature.

 I'm not trolling, just curious.

 There's no mention of this neither in runtime warnings nor in code
 comments, would a separate patch adding such warning (H264 +
 auto_convert=0) be welcome?

 Anyway, I believe I have researched this specific issue deep enough to use
 a specific options set (h264-in-mp4, libx264 x264opts=stitchable=1, concat
 auto_convert=0) in production.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5461#comment:21>
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