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

FFmpeg trac at avcodec.org
Sat Jul 3 22:07:14 EEST 2021

#9311: FLAC works in MP4 container but not in M4A
             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           |
Comment (by MAProsper):

 Hi Carl, thanks for the quick replay. I seen other tickets that go on for
 years, so it is higly appreciated. However I have several doubts maybe
 you, bing part of the project, may be able to answer.

 Everywhere I read MP4 is referred to as MPEG-4 part 14, which is a
 container specification under the open standard MPEG-4. Which also defines
 several other file extensions for diferent use cases, one of them is M4A,
 which is usally used for MPEG-4 part 14 containers with only audio. So I
 was under the impresion that since FLAC is now suported in MP4 (MPEG-4
 part 14), and M4A is the same container, it should also be suported.

 Additionally, I do not understand the reasoning behind the Apple support
 comment, since I thought that was up to the audio/video players. Plus, if
 one OS does not support it, that not a reason to hold back the others.

 Finally, the removal of the MP4 and M4A tags seems strange, as that was
 the topic of the ticket. Not to mention the addition of MOV, which was
 never discussed.

Ticket URL: <https://trac.ffmpeg.org/ticket/9311#comment:2>
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