[FFmpeg-trac] #9021(avformat:new): mkv: DATE_RELEASED should behave as TDRL tag in ID3

[FFmpeg]

#9021: mkv: DATE_RELEASED should behave as TDRL tag in ID3
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             Reporter:  malaterre   |                    Owner:  (none)
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by Christoph Päper):

 MP3tag also treats them the same as `RELEASETIME`:
 https://help.mp3tag.de/main_tags.html
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Ticket URL: <https://trac.ffmpeg.org/ticket/9021#comment:3>
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