I would like to share with you a couple of little things I've been keeping under my hat until I had time to make them presentable and readable for others. Originally, I had intended to write up a recipe or article about this stuff, but due to my current to-do list I wouldn't get around to it for several months. So I'm just going to put it out there.
Attached is a collection of shaders and Max patches that implement an optical-flow driven distortion. This allows you to do things like fake compression-artifact effects as well as some really swirly feedback stuff. It's all based around an aproximate implementation of Horn-Shuncke optical flow within a shader (good enough for experimental video) and a special "repos" shader that is optimized for the ab.hsflow output. The idea for these arose from research I was doing for a current video project, and was encouraged by the recent explosion of interest in these sorts of video effects. Please take a moment to play around with these, and be sure to post your own creations and alterations for everyone else.
Let me know what you think...