Ffmpeg problems on centOS 5.8 64 bit

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http://unix.stackexchange.com – I did install ffmpeg with winff, unsuccessfully when I try converting avi to x264, it says I don't have it. When I try to convert mp4 to Xvid I get unknown encoder 'libxvid'. It's like nothing really works except avi Msi compatible using winff, anybody help? (HowTos)