I've tested on my Ubuntu 12.10 64bit running Gnome 3.6 (and Unity) I get the audio no problem but no video playback, I just have a black screen. It also at this stage locks up wine firefox such that F11 etc do not work. If you want me to run any debug flags to generate traces/logs then let me know.
EDIT: I believe it due to this "err:winediag:X11DRV_WineGL_InitOpenglInfo Direct rendering is disabled, most likely your OpenGL drivers haven't been installed correctly (using GL renderer "ATI Radeon HD 5800 Series ", version "2.1 (4.2.11903 Compatibility Profile Context)").", I'll see what I can do to fix it.
UPDATE: Removing fglrx driver works, using non proprietary drivers instead. The issue as far as I know is getting fglrx 32 bit and 64bit drivers on ubuntu together.