Great site/posts/etc. I unzipped all of the files to C:\mplayer as well as the file I want to be converted (testing with a simple music video). When I paste:

mencoder -vf scale=240:180 dipsetanthem.mpg -o dipsetanthem.avi -of avi -ovc lavc -oac lavc -lavcopts vcodec=mpeg4:vbitarate=230:acodec=mp3:abitrate=64

I get after the "CPUflags:" line:

Compiled with runtime CPU detection.
Option lavcopts: Unknown suboption vbitarate
Error Parsing option on the compand line: -lavcopts

Exiting... (error parsing command line)

Can anyone help me with what I'm doing wrong? Thanks!