As asked in the dsub subforum http://forum.subsonic.org/forum/viewtopic.php?f=16&t=15378:
I transcode my music to AAC (ADTS stream) format for my phone, because of smaller file sizes. I'm very happy using DSub.
However I also sometimes use other music players on Android, cause not all my music is in subsonic (yet). Unfortunately, DSub writes the downloaded/caches songs without tags. It does write the m4a container files (partial or complete), with the aac/adts stream in it.
My request: on completing downloading a song, can the metadata (title, artist, album) be fetched from the server and added to the m4a container file?
However, as pointed out by another user:
It is currently NOT possible to stream AAC and get metadata, which is annoying for mobile apps. [...] it's problematic for anybody wanting to get higher quality audio and avoid MP3 compression.
Is it possible to implement a solution for this in subsonic?