Mencoder
From MohidWiki
Mencoder is a linux package you can find in the Ubuntu repositories. It allows you to encode video and audio format to other formats. Best used with Kino, the linux movie maker.
> mencoder input.mpg -o output.avi -ovc lavc -oac mp3lame -lameopts vbr=3 -vf scale=320:240
Commands to test
Two pass
> mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=1 \ -oac mp3lame -lameopts vbr=3 -o /dev/null
> mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:mbd=2:trell:vpass=2 \ -oac mp3lame -lameopts vbr=3 -o output.avi
Rescale
> mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=1 \ -oac mp3lame -lameopts vbr=3 -o /dev/null \ -vf scale=320:240
> mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:mbd=2:trell:vpass=2 \ -oac mp3lame -lameopts vbr=3 -o output.avi \ -vf scale=320:240