In order to use a video source, the frame grabber drivers also must be correctly installed. Follow instructions for your provider and platform.

The frame grabbers from http://www.epiphan.com/ have been used successfully with CustusX.

A quick check is to view the video using a standard webcam-application of some kind, f.ex. Photo Booth on Mac or Cheese on Linux. If this works, the video source should be ready to use in CustusX.