Also i noticed something weird... if i launch a 1080kbps xvid (with mp3 48000hz, 2ch) with no video using : mplayer -vo null filename.avi > /dev/null uses up 100% of cpu most of the time... That same xvid, launching without audio : mplayer -nosound filename.avi > /dev/null can play high quality video essentially flawless... but also uses 100% of cpu