Lately I started the work on media tags edition directly from Muuzik!
Sure there's already plenty of software to do the job but first, it's need to install something else, again, those soft as good and complete are too difficult to use for the average user which doesn't care for 90% of the possibility, why I only put a few tags, title, artist, album, year, that's all. Also I hide the all tag id3 concept in a more "open" language as media attributes. finally, not the less important, editing into Muuzik! synchronize with playlist, bookmarks and so.
So partial support, there's already several good node module for reading tags but a few for writing, so far I added support for mp3/id3 and flac. I'm working on m4v support but I eventually have to create a modules from scratch.
Since I planning a public release soon (yeah, 3 years I'm saying soon) m4v edit support won't probably be available at this time. So few things I still don't like, specially some freeze while processing long list and then it has to be beta test.
