[FFmpeg-trac] #6163(undetermined:new): concat demuxer produces invalid output with frame-held mp4

[FFmpeg]

#6163: concat demuxer produces invalid output with frame-held mp4
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             Reporter:               |                    Owner:
  JohnHawkinson                      |                   Status:  new
                 Type:  defect       |                Component:
             Priority:  normal       |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  concat       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Cigaes):

 The {{{+}}} in front of the pixel formats does not do what you think it
 does. Remove it in your first command and try again.

 With {{{-c copy}}}, if you read your command outputs carefully, you will
 realize you are trying to concatenate PNG with H264, it can not work.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6163#comment:4>
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