[FFmpeg-trac] #4423(avformat:new): Set AV_DISPOSITION_ATTACHED_PIC for MKV Cover Art

[FFmpeg]

#4423: Set AV_DISPOSITION_ATTACHED_PIC for MKV Cover Art
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             Reporter:  malaterre  |                    Owner:
                 Type:  defect     |                   Status:  new
             Priority:  normal     |                Component:  avformat
              Version:  2.6.1      |               Resolution:
             Keywords:             |               Blocked By:
             Blocking:             |  Reproduced by developer:  0
Analyzed by developer:  0          |
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Comment (by heleppkes):

 Matroska uses codec_type == AVMEDIA_TYPE_ATTACHMENT, with mimetype and
 filename in metadata, since it can carry any generic attachments, and not
 just images. The code should probably be updated to use that in addition
 to the current check.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4423#comment:1>
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