this post was submitted on 07 Mar 2026
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AAC always confused me. I've seen them use the extensions .m4a, .mp4, and .aac. But they're all different are they not? I still have a few albums I downloaded on iTunes back in the day and they're all .m4a. More confusing however, ALAC also uses the .m4a extension. I think Apple is bad at naming things.
They are just file extensions that refer to containers. .m4a and .mp4 use an MP4 container which allows for metadata while .aac is raw.