That's really suprising, maybe I have some XFree86 configuration problem?
I tried to use XVideo extension on my computer, and it didn't work. I have NVidia Riva TNT2 and I use 4191 version of the
kernel-xfree driver combo. I use XFree 126.96.36.199 cvs snapshot, and
Linux 2.4.20 kernel. I've compiled both nvidia drivers myself. Everything, but xv, works fine (-vo gl -vo gl2 in MPlayer uses hardware acceleration), and I'm pretty sure, that I'm using drivers, I've compiled (I get this nvidia logo during xfree startup).
When I run xvinfo, I get 'no Xvideo extension found' or similiar info(I don't remember right now).
Any ideas why?