Sorry I didn't notice the post above, I read about 5 pages of this post and got tired of not finding my answer so I just posted.

But I'm still getting the same error message as before accept instead of "couldn't find encoder for mp3" it says "couldn't find encoder for mp3lame", heres what I"m typing:

mencoder -vf scale=240:180 C:\Dr._Tran.flv -o C:\Dr._Tran.avi -of avi -ovc lavc -oac lavc -lavcopts vcodec=mpeg4:vbitrate=230:acodec=mp3lame:abitrate= 64