Dump to AVI

Is there any way I can stream to an AVI? i.e. I want to capture all graphics I've rendered just before I do a flip, and do this each frame.
Or is there a way of saving a screen dump each frame?

You can do a GrabPixmap() followed by a SavePixmapPNG() to save an image, then use a program such as VirtualDubMod to combine the images into an .avi

http://virtualdubmod.sourceforge.net/