Genlock technology demo from IBC

OK - admittedly this video does not really show very much at all because of the jerky handcam and YouTube compression artifacts. What it is supposed to show, is a demo from IBC of a FirePro technology demonstration of genlock - the synchronization of a video output to some external reference. Both of the computers featured in this clip are receiving an external video signal. The computer on the left is actively synchronizing the video output (to its monitor, shown) in the clip, and video refresh is in time with the input signal, resulting in smooth video playback. On right hand side, the computer is not synchronizing to the input signal; this results in the video being updated (in GPU memory) before the previous frame has been displayed. This causes a horizontal disruption/break in the displayed image.

As I said, it is hard to see the tearing in the non-genlocked image with this compressed video, but in real life it is all too apparent and strikingly different from the genlocked image - hopefully you get the idea.