A lot of movies are done by a cam corder and are not of the best quality usually you find this on the TMD movies....

Then you can get dvd rips which are usually really good quality...

Nero is one of the best programs for burning, try slowing down your burning speed to the minimum as this can also help with picture quaility...

Also Bitzi is a good site to find out the quality of a file...

This link will explain to how to use and what Bitzi is....
http://www.gnutellaforums.com/showth...id=37676.....;)