Re: Hardware acceleration for Linux?
Also, if using XvMC with mplayer don't forget adding the switch -vc ffmpeg12mc to the commandline.
If watching HDTV streams (720p or 1080i), you can also try different xvmc suboptions (xvmc:queue, xvmc:sleep, etc.). The suboption "queue" creates an array of surfaces for the card to process, which can be helpful is some situations. The suboption "sleep" is a saner way of waiting for the card to finish rendering (those very large HDTV frames) without eating lots of cpu.
Of course, your mileage may vary...