Ok... please reinstall libfaad2-0 from the official Ubuntu packages in multiverse. Your's is from a 3rd party repository (probably Debian Multimedia?) and incompatible with the Ubuntu one...
sudo apt-get install libfaad2-0/edgy should do this. ** Changed in: gstreamer0.10 (Ubuntu) Status: Needs Info => Rejected -- Edgy: no audio for mp4 files https://launchpad.net/bugs/71689 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs