Prevent Decklink from automatic capture playout

Hi,

I'm using the DeckLink 4K Extreme 12G (driver version 10.6.2a3) with the Linux/Sample/Capture application.

When capturing, the card displays frame currently being captured on output ports.
How to prevent that?

Thanks,
Tim

[Nicholas Gill]

Hi Tim,

There is no general method to disable the capture pass-through feature using the DeckLinkAPI.

However, as the DeckLink 4K Extreme 12G is a full-duplex device, it is possible for the application to perform a capture operation, and simultaneously enable video output.

In this case the application does not need to schedule video frames, it is sufficient for the application to obtain a reference to IDeckLinkOutput (using QueryInterface) and to enable video output using IDeckLinkOutput::EnableVideoOutput.

The content of the video output is then under application control - captured video frames will not appear on the output unless explicitly scheduled by the application (or video output is disabled).

Cheers,

-nick