Originally Posted by EciDemon
FXAA is a post process AA filter designed primarily to reduce aliasing in differed rendering engines where msaa isn't compatible.
Having used it a lot in Age of Conan I think its pretty darn nice filter with a very small performance hit (less then 2x msaa) while still looking pretty good.
EDIT: HardOCP did a nice analysis of fxaa recently and compare it with the equivalence from Ati. It's some good read linky
This is done while playing? Or after capturing footage? I mean is it done live or is it like an effect I add to a video file.