I'm using VirtualVCR with MJPEG set to 19 to capture to 640 x 480 and i haven't really noticed this before, so i'm not sure how long it has been happening for but my preview looks clear, however as soon as i press record the preview video goes grainy/snowy, and the capture appears to be slightly grainy/snowy also.

is this a setting problem, or a driver problem or something else?