FFMpeg has AAC and MP3 codecs already, which means the driver does too.
Some codecs may not play nice with my (somewhat naive) player implementation, this I may be able to fix.
However, I won't be spending a lot of time fixing something that is only useful to modders.
:EDIT:
The crash you're getting is an alignment issue, FFMpeg needs to be compiled with a newer version of gcc. Probably won't be fixed anytime soon.