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.
It is hard to see the tearing in the non-genlocked image, in this compressed video, but in real life it is abundantly clear. Genlocking is essential in many professional video scenarios, especially in broadcast and other cases where multiple video devices (PC Workstations, Video decks, cameras etc) are operating together.
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