Quick note: I took a guess at the meaning of a word ("meandering") apparently defined in some papers I can't get hold of... whether or not I guessed right, it seems to help under some circumstances. So...
Motion, 28 October 2005
If you really want to try quarter-pixel accuracy the slow C way, add
subpixel = true and
useassembly = false. It only runs at 30 FPS or so on 720 x 576, so for testing purposes I would recommend cropping down your clip until you can watch it in real time. (I probably won't have time to assemblify it for a while.)