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This question is overflow from the following question:
How do I programmatically convert mp3 to an itunes-playable aac/m4a file?
Anyway, I learned how to create an aac file and then i found out that an aac is not just an m4a file with a different file extension. In fact, I need to somehow wrap the aac into an m4a container. Ideally I’d be able to simply make a call to the command line.
mp4box if you want a dedicated tool; its probably the easiest way to go. ffmpeg can do the job too.