[FFmpeg-trac] #10471(undetermined:new): FLAC in MP4 ignores WAVEFORMATEXTENSIBLE_CHANNEL_MASK Vorbis Comment

[FFmpeg]

#10471: FLAC in MP4 ignores WAVEFORMATEXTENSIBLE_CHANNEL_MASK Vorbis Comment
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             Reporter:  John Regan   |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by John Regan):

 After discussing with the FLAC project I do think this is a bug.

 The primary definition of FLAC is considered the IETF spec -
 https://datatracker.ietf.org/doc/draft-ietf-cellar-flac/ - and the spec is
 considered to apply to all encapsulations of FLAC, including MP4.

 Since the FLAC spec states that the `WAVEFORMATEXTENSIBLE_CHANNEL_MASK`
 comment within a Vorbis Comment Block is used to signal a channel layout,
 and the ISO encapsulation spec allows for including Vorbis Comment Blocks
 in the FLAC Specific Box - the comment block should be parsed and the tag
 honored, similar to native FLAC files.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10471#comment:3>
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