nvidia vdpau

Using vdpau with Nvidia cards should get you great performance with smplayer, and will ensure that you use very little cpu when playing dvds and x264 encoded video. As has been discussed in detail on the Ubuntu forums, it is very important to note that

Vdpau is two things. One, a display device, like xv. The other, a codec that can use the PureVideo chip to decode certain files

Fonte:
http://askubuntu.com/questions/183430/tweaking-smplayer-for-quality-over-performance




mplayer  -vo vdpau -vc ffh264vdpau movie.mkv