If you get this error you probably compiled mencoder and mplayer without Xvid support.
To fix this error you need to re-compile mencoder and add Xvid codec support. Please refer to this guide Compile Mencoder and Mplayer with Xvid and H264 Support
If you get this error you probably compiled mencoder and mplayer without Xvid support.
To fix this error you need to re-compile mencoder and add Xvid codec support. Please refer to this guide Compile Mencoder and Mplayer with Xvid and H264 Support