[FFmpeg-trac] #3623(undetermined:reopened): Mixed results writing M4A metadata

[FFmpeg]

#3623: Mixed results writing M4A metadata
-------------------------------------+-------------------------------------
             Reporter:  svnpenn      |                    Owner:
                 Type:  defect       |                   Status:  reopened
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  mov          |               Blocked By:
  metadata                           |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by svnpenn):

 Correcting myself. I can get correct metadata with this file [1], if I add
 "-f mp4":

 {{{
 ffmpeg -i Miaow-02-Hidden.m4a -c copy -movflags faststart -f mp4 out.m4a
 }}}

 However this file:

 {{{
 youtube-dl -f 140 http://youtube.com/watch?v=j-70HbaR4g4
 }}}

 I can only get correct metadata, if I destroy and rebuild the file like
 this:

 {{{
 ffmpeg -i 'Confetti (Remastered)-j-70HbaR4g4.m4a' -c copy good.aac
 ffmpeg -i good.aac -c copy -bsf aac_adtstoasc -metadata title=Confetti
 -movflags faststart good.m4a
 }}}

 1. http://jplayer.org/audio/m4a/Miaow-02-Hidden.m4a

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Ticket URL: <https://trac.ffmpeg.org/ticket/3623#comment:14>
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