Video Capture Card

Hello, I own off brand video capture cards for my younger sons. The capture cards work as expected in Broadcaster but Gamecaster only recognizes the video capture cards as more of a webcam device and won’t share as the main source?
I have lifetime access to Broadcaster for myself and annual access passes for both of my sons. My problem, however, is that they are only 13 and 14. They are learning but Gamecaster seems to be an easier and better choice for them at this time. Is there a way to get Gamecaster to recognize their capture cards as a main source?

Thank you!

Hi there, may I ask what particular capture card you are using?