To fix this just use.

mencoder filename.ogv -ovc xvid -oac mp3lame -xvidencopts pass=1 -o output.avi

or just use ffmpeg to record

ffmpeg -r 30 -s 1366x768 -f x11grab -i :0.0 -vcodec msmpeg4v2 -qscale 2 -f alsa -ac 2 -i pulse -acodec pcm_s16le filename.avi