When you don’t have genlock, you can output
stable black so DeckLink Extreme locks the deck.
This output is always stable and allows the deck to
be set to input reference or auto reference. If you
are using a digital deck, be sure to set the “Black
Video Output to Deck in Capture” option to “On
Digital SDI Outputs” in the DeckLink control panel,
when using this feature. If you are using an analog
deck, be sure to set the “Black Video Output to
Deck in Capture” option to “On Analog Outputs”.