add a function to c code, that copies a frame into a lisp array
i thought this would solve the speed issues but now i only get 1.9fps with the hinton videos
i was processing full frames, i moved decimation settings to one point now
also, there i didn't copy all bytes from the c library
okay, i think it now plays the videos very fast.
unfortunately, its not impressive at all. the binary images just get some gray values.