Error initializing -vo device in mplayer

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http://www.linuxquestions.org – Guys Please help me I have installed slackware 13.1 on my friends laptop. Its an msi laptop . dual core 2ghz, 1gb ram nividia 9000 series.etc. everything is fine but after installing mplayer codecs from slackbuild and also xvidcore, i am not able to play avi files in mplayer. It is giving me a fatal error saying. error initializing -vo device. i tried to change the video driver. it was by default xv then i tried X11(xvid) then open gl and open gl with max textures . when i made it to open gl with max textures the video out came but it is lagging wi (HowTos)