[FFmpeg-trac] #9641(avformat:new): Matroska duplicate tags are only output once instead of repeated

[FFmpeg]

#9641: Matroska duplicate tags are only output once instead of repeated
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             Reporter:  the-black-   |                    Owner:  (none)
  eagle                              |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avformat
              Version:  unspecified  |               Resolution:
             Keywords:  matroska     |               Blocked By:
  metadata                           |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Matthew):

 Is anyone working on this? It seems like it shouldn't be an overly
 difficult fix...

 I have been searching (in vain, it seems) for a way to edit opus tags;
 ffmpeg ''almost'' works except for this bug, which seems to still be
 present in at least 6.0.1.

 In my case, I specifically want to add multiple `METADATA_BLOCK_PICTURE`.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9641#comment:2>
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