Blackmagic Forum

I'm using the SDK and the Decklink duo 2. I'm able to preview and capture video without issues, but I can't find a way to query the card to see which inputs are attached to a live video stream. We sometimes have one camera attached, sometimes 2, and I'd like to be able to automatically detect this. Right now, I've had to hard-code which input might have a camera attached, and then in the DrawFrame routine in the IDeckLinkScreenPreviewCallback check to see if the camera has sent a timecode (all of our cameras do).

It seems there would be a more direct way to query the device to see which inputs have incoming video streams, but I can't find it.

Thanks

Hi Mark,

You can use the IDeckLinkStatus interface to detect whether you have an active signal - use the Status ID bmdDeckLinkStatusVideoInputSignalLocked [1].

You can then create a IDeckLinkNotificationCallback interface to provide a callback function when the signal lock changes. You will need to implement the IDeckLinkNotificationCallback::Notify method [2].

Please review and run the StatusNotification example in the Desktop Video SDK package to see how this is done.

Regards
Cameron

References
[1] 2.7.59 DeckLink Status ID
[2] 2.5.34.1 IDeckLinkNotificationCallback::Notify method

Help me... 8k pro
I can't use 4 inputs why. My 8k pro card capture only one input source. Can edit SDK for solve this issue. My PC 2nd genaretion core i3 16gb ram and 4gb Nvidia Gpu.

The 8K pro is only 1 input 1 output card!! It can do a Single link, Dual link or Quadlink connection. But still only 1 source in / out! Not 4 sources!!

Hey,
Thanks for sharing such input, keep sharing.