This is "kinda" covered by another feature request but is too heavily tied to iTunes hence a fresh approach.
Would it be possible to extract the metadata from m4a and mp4 (audio) files as you do for mp3, flac, etc.? I've no idea but can't the faad2 library be used to obtain this information? The commandline version can certainly display it, e.g. faad2 -i <filename> will dump out all the metadata, artist, album, etc.
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I have to take a look at faad2, if it is capable of handling those files we can surely add this. We also got a code contribution for metadata extraction using ffmpeg, maybe ffmpeg can handle m4a files as well.
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I added mp4 metadata extraction using libmp4v2, it also includes cover art support (for that libmagic is required).
The feature is in current SVN, if you feel comfortable building from source - please try/test, otherwise just wait for the 0.12 release :>
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Great, thanks, I'll take a look-see