Hardware Talk :: Does the DSL store sell a media server?
Hm, no idea if I ever was using xvmc (I've only been using basic Xv)... but AVIVO can be transparently used through the Xv extension (offloads onto the gpu's 3d engine). I suppose xvmc is an extension that's supposed to be more efficient?
But there's always opengl playback on capable cards which should work 
original here.