[FFmpeg-trac] #3647(undetermined:new): caf muxer doesn't obey Apple Core Audio Format Specification 1.0, section Information Entry Keys

[FFmpeg]

#3647: caf muxer doesn't obey Apple Core Audio Format Specification 1.0, section
Information Entry Keys
-------------------------------------+-------------------------------------
             Reporter:  nu774        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 In
 https://developer.apple.com/library/mac/documentation/musicaudio/Reference/CAFSpec/CAF_spec/CAF_spec.html#//apple_ref/doc/uid/TP40001862-CH210-BCGBAEAD,
 it is written as:
   Apple reserves keys that are all lowercase.
   Application-defined keys should contain at least one uppercase
 character.
   Each key can be used only once. You can specify multiple values
   for a single key by separating the values with commas.

 ffmpeg just directly writes it's internal tag key. It doesn't convert to
 upcase keys, nor it does respect predefined keys by Apple.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3647>
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