[FFmpeg-trac] #4591(avformat:new): attachments mjpeg are discovered wrongly as video stream and therefore h264 encoding is broken

[FFmpeg]

#4591: attachments mjpeg are discovered wrongly as video stream and therefore h264
encoding is broken
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             Reporter:  TheoMeister  |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:  avformat
              Version:               |               Resolution:
             Keywords:  attachments  |               Blocked By:
  video                              |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by heleppkes):

 Exporting Cover Art as pseudo video streams is the correct way to export
 them. They have appropriate metadata set to detect that they are single-
 frame pseudo streams.

 They should not be used for transcoding automatically AFAIK, but if you
 force them to be used with -map, then thats your own doing.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4591#comment:1>
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