Vb.Net Take snapshot of streaming webcam video (over internet)

I have a video streaming of a security webcam. I'd need to take screenshots at a as high as possible resolution at regular intervals.

Option 1 would be to fullscreen the video and take regular screenshots and save them but I'd have the computer busy and couldnt work on it anymore.

Option 2 would be to somehow capture the webstream, and extract a screenshot from the stream.

Are there any better otpions? How could i capture screenshots from the stream?

Thanks