29.09.2017 0:20, Carl Eugen Hoyos пише:
Hi!

I don't have decklink hardware but I assume it never outputs actual
transparency.
Or does it?

it outputs or use internal keyer to put it over passthrow SDI signal.

in external keyer mode it accept BGRA frame and output two SDI signals: one for *fill* another one for *key*

--
Maksym Veremeyenko

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