Video
Genlock / House Sync
01 — Definition
Locking several video sources to a common timing reference. Without genlock, cutting between cameras produces a visible flash. The reference is typically Tri-Level Sync in HD and Black Burst in SD, and every camera, capture card and switcher in a broadcast chain genlocks to a single house sync generator.
02 — In the field
Camera cuts flashing, or dropping momentarily to black on output? Genlock is either not connected or not locking. Check that the reference signal reaches the camera input, and that the camera is set to external sync mode.