[FFmpeg-trac] #3646(undetermined:new): caf muxer doesn't write correct format id in desc chunk for ALAC

[FFmpeg]

#3646: caf muxer doesn't write correct format id in desc chunk for ALAC
-------------------------------------+-------------------------------------
             Reporter:  nu774        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 How to reproduce:
 {{{
 % ffmpeg -i foo.alac.m4a -c:a copy bar.alac.caf
 }}}
 In case of ALAC, mFormatID field of desc chunk has to be one of the
 following:
 1: 16bit
 2: 20bit
 3: 24bit
 4: 32bit
 ffmpeg caf muxer always writes zero.
 This is not very important since these information is included in codec
 startup data (magic cookie), but incorrect anyway.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3646>
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