Here is a great link to install the latest version of ffmpeg. http://www.apaddedcell.com/installing-the-latest-ffmpeg-on-ubuntu-feisty-fawn-7-04

I have been using DVD::RIP to convert VOB Files to MPEG. But, with the older version for some reason I kept getting a  strobe effect along the top for the first 20 seconds. weird? But, when installing the latest version of ffmpeg it converted like a champ.