This question is overflow from the following question:

[How do I programmatically convert mp3 to an itunes-playable aac/m4a file?](https://stackoverflow.com/questions/70096/how-do-i-programmatically-convert-mp3-to-an-itunes-playable-aacm4a-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.