I know the video can be compressed using ati gpu, but I don't know how to begin from where? oh, big guys, who can give me some advice, thx.
There was a talk at Siggraph 2008 regarding this topic. Perhaps, you can contact the presenter. His information can be found at http://www.siggraph.org/s2008/attendees/techtalks/talks.php
It is the last item in the exhibitor talk.