[FFmpeg-trac] #1052(avformat:new): libavformat doesn't preserve some metadata for mov containers

[FFmpeg]

#1052: libavformat doesn't preserve some metadata for mov containers
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             Reporter:  bbraun    |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  unspecified
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 libavformat doesn't support writing the metadata tags: episode_sort,
 season_number, media_type, hd_video, or gapless_playback.

 Attached is a diff to provide writing these metadata tags.

 This can be reproduced by:
 ffmpeg -i foo.m4v -metadata episode_sort=2 -metadata season_number=5
 bar.m4v
 ffmpeg -i bar.m4v
 look for those metadata tags.  They are not preserved.

 Additionally, when reencoding files that have these tags set, the metadata
 is not preserved.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1052>
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