I was looking at programs similar to Imagegrabber from http://www45.brinkster.com/antworkz, but that site appears to be down.
I came across Imagegrab:
http://paul.glagla.free.fr/imagegrab_en.htm
It looks like a cool little utility:
ImageGrab is a nice utility aimed at extracting images from all kind of videos, also from Video CDs or SVCDs, and even from live video streams which are delivered to the computer by a webcam, a camcorder or an analog video capture card. It includes a multimedia player able to play the video even in full screen, to seek precisely in the video, frame by frame, to catch pictures from the video either in bmp or jpeg format. The image may be easily corrected, in order to respect an aspect ratio of 4x3 or 16x9. ImageGrab is able to catch automatically a series of images at a scheduled interval.
ImageGrab is freeware, you may freely use it and distribute it, as long as it is not for a commercial or professional purpose. It is not open source, so please don't ask me for the source code. When using ImageGrab, you use it as is, on your own risk. My principle is: "It works well for me, it could work well for you, but perhaps not. Try by yourself, and please give me some feedback in order to improve my applications".
He also issues a freeware program that captures video and audio streams called "CaptureFlux"
http://paul.glagla.free.fr/captureflux_en.htm
Both programs are small, so you will need a codec pack installed, or load the necessary codecs individually.
Has anyone had experience with these?