HardwareXL is out to help you get started using Avisynth in ffdshow & all of its plug-ins. They've even included the setup & use of a script called Limitedsharpen, which will filter DVD playback in real time. Cool stuff.

" I soon found an extraordinary Avisynth script written by Didee on Doom9's Avisynth forums called Limitedsharpen. This script was designed for the pre-processing of video and film prior to being encoded and burned to DVD or stored on hard drives. However I found if its settings were turned down enough it could be used in real time for DVD playback with amazing results and consequently Live TV as well."