in reply to Webcam Streaming to Perl/Tk with ffmpeg
I did something similar to this a while back ... In Search of a Better Mousetrap.
It uses a capture program called "Fwink" for capturing the images, sends them over a network to a different computer, and lets you watch what's happening remotely. It has a maximum throughput of 1 image per second (the limit is imposed by Fwink).
Hopefully it can give you some ideas.