The nvidia driver README.txt tells that XvMC is only supported "... on GeForce4, GeForce FX and newer products" but the Geforce3 specification lists "motion compensation" as a feature as well. In my Xorg.0.log there is the line "(II) Loading extension XVideo-MotionCompensation" but the applications I tried (mplayer and MythTv) are complaining about missing xvmc. I wonder if it's a hardware (no xvmc) or a software (wrong/incompatible/old libraries) problem.
I use Fedora 8 (Xfce) with a recent kernel (184.108.40.206-42). The nvidia driver I use are the following precompiled packages from the atrpms repository:
I've created the file /etc/X11/XvMCConfig for the wrapper with the name of the concerned xvmc nvidia librarie libXvMCNVIDIA_dynamic.so.1 but it doesn't change anything ...
Thanks for you support.