I recently bought a Nvidia GT 440, and installed the proprietary
Every player seems to be working alright with VDPAU, except Mplayer frontends like SMPlayer.
Any ideas on why this is happening?
If it actually works with mplayer:
in SMPlayer, it should be as simple as setting it to use vdpau in Options / Preferences / General / Video. Set the Output driver
How did you install the proprietary drivers and are you sure the required libraries for vdpau are installed?