[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):

 > You originally described that if you pipe the content of file into
 ffmpeg you get different output (that also behaves differently) than the
 output from one (theoretically identical) ffmpeg invocation.

 No, originally I used these commands:

 {{{
 ffmpeg -i superuser.mp4 -c copy good.aac
 ffmpeg -i good.aac -c copy -bsf aac_adtstoasc -metadata title=Confetti
 -movflags faststart good.m4a
 }}}

 as shown at the top of this page. Later, I did use this as well:

 {{{
 ffmpeg -i confetti.mp4 -c copy -f adts - |
 ffmpeg -i - -c copy -bsf aac_adtstoasc -movflags faststart -metadata
 title=Confetti good.m4a
 }}}

 but the difference is irrelevant, as both do the same thing, only one uses
 a pipe, and one uses a temp file.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3623#comment:16>
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