> Summary: failure to auto detect AAC file even with --magic
> 
> Initial Comment:
> a file which plays fine with a .m4a extension yields this when it has a 
> different extension:
> 
> play FAIL formats: no handler for file extension `aac'
> play FAIL formats: no handler for detected file type `audio/x-hx-aac-adts; 
> charset=binary'
> 
> sox should know that aac is the same thing as m4a.

(1)

It's not

(2)

Files named *.m4a (and a few other file formats)
are just delegated to ffmpeg; the interaction of
sox with ffmpeg is not very reliable; you are probably better off
processing your aac files in ffmpeg directly


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