[FFmpeg-trac] #8791(undetermined:new): Metadata will not copy over going from opus to mp4

[FFmpeg]

#8791: Metadata will not copy over going from opus to mp4
-------------------------------------+-------------------------------------
             Reporter:  Tupsi        |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  opus, mp4,   |               Blocked By:
  metadata, m4b                      |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Changes (by Tupsi):

 * keywords:  opus, mp4, metadata => opus, mp4, metadata, m4b


Comment:

 I found another bug related to this. If you try the output suffix .m4b
 instead of mp4 ffmpeg complains

 {{{
 [ipod @ 000002752a9ea380] Could not find tag for codec opus in stream #0,
 codec not currently supported in container
 Could not write header for output file #0 (incorrect codec parameters ?):
 Invalid argument
 }}}
 but isnt mp4 and m4b the some container, the difference only explaining to
 the user that the latter is an audiobook (with chapters) where the first
 is mp4 in general, but in the end, we are talking about the same
 container?
 Not that I need the .m4b suffix atm as I am "apple free" atm, but for
 completeness that could be changed as well.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8791#comment:5>
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