Originally posted by Vgui
Have you been able to play m4a or Quicktime files at all? Just because you say you can play anything, and I wouldn't mind knowing what can play these.
I've played them in MPlayer without much trouble. Quicktime streaming can be a bit of a pain though as well as other streams. I found an excellent extension for Firefox called MediaPlayerConnectivity that solves a lot of headaches. It lets you open a video stream into an external player...MPlayer in this case.
The MPlayer website is at www.mplayerhq.hu
and there are several sites out there that help you install it. I run Fedora and I found an excellent walkthrough here:
It might not be the same for your distro, but it should point you in the right direction.