TV Wonder channel changer

I have an ATi TV Wonder card that is hooked up to a CCTV camera. I am
running a webcam program to capture the CCTV camera every 2 mins and
upload it to my server.

I was wondering if anyone knows of a utility or webcam software that
can automatically tune between two or more UHF channels every minute
so I can add 2 cameras with their own TV channels and have the TV card
switch between them just before the webcam software takes a capture.

TIA.