How does Ref IN work for Blackmagic Decklink Cards?

According to the documentation you can sync video signal inputs in Unreal by referring one input on the Blackmagic Decklink.

With Aja cards you can use the ref in, instead. So how does it work for Decklink? A standard video input is enough to sync everything as long as they are already synced externally from the editor?

I am confused.

Hi, did you find an answer?

Mini Militia App Lock 7Zip

Nope, i’ll try on Blackmagic forum.