[FFmpeg-trac] #9044(avformat:new): Writing album art to ogg / opus files

[FFmpeg]

#9044: Writing album art to ogg / opus files
-------------------------------------+-------------------------------------
             Reporter:  b_bepis      |                     Type:
                                     |  enhancement
               Status:  new          |                 Priority:  normal
            Component:  avformat     |                  Version:  git-
             Keywords:  ogg          |  master
  thumbnail                          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Implementing reading album art from ogg files was implemented in #2655,
 however not writing them.

 Album art is placed in a `VorbisComment` with the name of
 `METADATA_BLOCK_PICTURE`. It uses the same data structure as FLAC for
 album art.
 https://wiki.xiph.org/VorbisComment#METADATA_BLOCK_PICTURE

 This has already been implemented in FFMpeg in reverse for reading:
 https://github.com/FFmpeg/FFmpeg/blob/069d2b4a50a6eb2f925f36884e6b9bd9a1e54670/libavformat/oggparsevorbis.c#L148-L182

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Ticket URL: <https://trac.ffmpeg.org/ticket/9044>
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