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I have video card ATI Radeon 2600 XT. Operating system: Ubuntu. Question: how to enable HD video acceleration for ATI card in Ubuntu?

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ATI doesn't have video acceleration under linux. However, ATI seems to be working on a new driver which would bring support for VA-API. (As far as I know).

On Linux, you can use "ffmpeg-mt" (if you got multi-core cpu, it'll decode the movie with X core) or just give extra parameters for mplayer.

Like: mplayer -fs -really-quiet -vo xv -ao oss -vfm ffmpeg -lavdopts fast=1:skiploopfilter=all $file

You can give these parameters in smplayer, options, advanced.
Just type the following there:

-fs -really-quiet -vo xv -ao oss -vfm ffmpeg -lavdopts fast=1:skiploopfilter=all

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While they don't support Xv directly, they do support OpenGL and quite a few video players can output through that. I recall ATI having issues with OpenGL video while on a composite desktop however, but that was years ago and is likely to be fixed by now. – user32498 Apr 3 '10 at 18:25
Don't hope for such thing when it comes to ATI. Well..worth a try. Smplayer, and choose the gl (ATI) output. Maybe it'll work. Maybe. :/ || Thanks for the edit (Nik). – Shiki Apr 3 '10 at 20:19
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Try to install Fglrx Driver. if the system supports the type of graphic system you use, for HD 4xxx / R700 based cards according to you stated, it can easily be installed using System => Administration => Hardware Drivers. .. also you'd take a look at that one too.

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