Thanks for the info. I have the latest removegrain.dll files in the plugins directory. I read the following post which talks about this same issue and that the "temporal" dll's fix the issue. When I install them, I then get errors saying that the removegrain.dll's cannot be loaded, even though they are in the plugins directory. I appreciate all of your help. Been trying to get this script to work for about three months now and it is getting frustrating.

http://videoprocessing.11.forumer.com/viewtopic.php?t=104

I believe I had the removegrain dll's from the package, but it was causing the HCendor gui to crash. Doing some reading, I updated to the latest removegrain package. Should also mention using HCEncoder .23 and Avisynth 2.5.8 beta. I see that the full 2.5.8 is out, so I will upgrade though I'm not sure if that will have any bearing.