[FFmpeg-trac] #9311(avformat:closed): FLAC works in MP4 container but not in M4A

[FFmpeg]

#9311: FLAC works in MP4 container but not in M4A
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             Reporter:  MAProsper   |                    Owner:  (none)
                 Type:  defect      |                   Status:  closed
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:  invalid
             Keywords:  flac mov    |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by MAProsper):

 Hi Carl, thanks again for that simple comment. Those doble equals
 definetly did wonders. Now I understand it alot better, or at least that
 is what I think.

 So MPEG-4 (MP4) was based on the QuickTime (MOV) file format, that solve
 my misconception created due to the amount of similar information I found.
 Surprisingly there is very little about their realtion, but enough to
 understand it.

 Continuing with the rabbit hole of research; I found out Apple does in
 fact support FLAC, at least since macOS 10.13 according to the WWDC 2017
 and Wikipedia. However since I clearly have some gaps of knowlage in the
 topic it might be better left alone.

 So to finish this of, if you select M4A even if it both formats share the
 extension, FFmpeg will follow the QuickTime standard over MPEG-4.

 Thanks a third time for all this information and hope you have a great day
 sir.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9311#comment:4>
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