[FFmpeg-trac] #7621(avformat:open): Add .avif support (AV1 Image File Format

[FFmpeg]

#7621: Add .avif support (AV1 Image File Format
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             Reporter:  Ewout        |                    Owner:  Vignesh
                                     |  Venkatasubramanian
                 Type:  enhancement  |                   Status:  open
             Priority:  wish         |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  mov          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Balling):

 >When encoding, parameters like transfer, matrix, primaries and
 chroma_sample_positiona are usually set by the user (according to
 libavcodec documentation).

 That is false ever since the auto insertion got implemented in
 7369595c556516b90bf3acdf85043dc11add7d89 (in practice not everyone
 migrated to it, like libx264 encoder wrapper and there is a bug when you
 go from RGB to some of 3 types of YCbCr). The point is it does work though
 for AVIF. You just forgot to implement chroma_sample_position syntax
 element (encoded using two bits). See this, looks like center will be
 implemented using CSP_UNKNOWN.
 https://github.com/AOMediaCodec/av1-avif/issues/88
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Ticket URL: <https://trac.ffmpeg.org/ticket/7621#comment:25>
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