1. prepare your avi files for Ben:

for i in $(echo "*.avi"); do /usr/bin/mencoder -o "$i.mpg" -vf scale=320:-2 -of mpeg -ovc lavc -lavcopts vcodec=mpeg1video:vpass=1:vbitrate=200 -ofps 24000/1001 -oac lavc -lavcopts acodec=mp2:abitrate=64 "$i" && /usr/bin/mencoder -o "$i.mpg" -vf scale=320:-2 -of mpeg -ovc lavc -lavcopts vcodec=mpeg1video:vpass=2:vbitrate=200 -ofps 24000/1001 -oac lavc -lavcopts acodec=mp2:abitrate=64 "$i"; done

2. play your files with Ben:

mplayer -vo sdl -ac mad file.mpg