http://drivers.s3graphics.com/en/dow...nux/Readme.txt
S3 Graphics Chrome4xx_5xx Linux driver package includes a patch to MPlayer to enable
GPU accelerated H.264/VC-1/WMV9/MPEG-2 video decoding through VA-API.
Code:
S3G linux driver also implemented a new video API called VDPAU. This API is used by the latest
SVN version MPlayer for video acceleration.
So even S3 has hardware accelerated video decoding for Linux users, that only leaves out AMD...
AMD is making a complete fool out of itself by not letting Linux users make use of the hardware accelerated video decoding features of their GPUs.