is there a program that allows me to convert a DVD back to an avi file so I can edit it with premiere...
There ar many ways to convert DVD to AVI, there is a Tute using Vidomi in the Tutorial section.
You don't even need to convert if you use avisynth as a frameserver.http://neuron2.net/www.math.berkeley.edu/benrg/avisynth-premiere.html//Danne
i agree no sense to convert it to avi. everytime you reencode something in a lossy format you loose quality. You can edit mpeg2 files if you frameserve it or demux the streams out of the dvd
AVI does not have to be lossy, after all it is just a container.
To get AVISynth working with some programs you may need ffdshow/ffvfw's MakeAVIS to create a fake AVI from your script.