I use AVISynth with Link2 to frameserve Sorrenson Squeeze for encoding to QT and WM9 at around 300kbps. I add PixieDust(1) to the script in order to better prepare the video for low bitrates.

I normally get good results but was wondering if there is a superior filter or combination of filters that will give better results at these low bitrates.

Am I right in thinking these types of filters are temperal filters and where can I read about the theory behind them?