[FFmpeg-trac] #4347(avformat:new): support writing crc elements to level 1 elements of matroska

[FFmpeg]

#4347: support writing crc elements to level 1 elements of matroska
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             Reporter:  dericed      |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  wish         |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  matroska,    |               Blocked By:
  crc                                |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by dericed):

 mediainfo can now verify EBML CRC-32 elements in Matroska. I also note
 that mkvclean can write level 1 CRC-32 elements while re-muxing.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4347#comment:6>
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