when I use wirecast with a blackmagic studio card, all I get is a black screen with Decklink Studio 2_1 text. I've successfully added the same camera to wirecase using firewire and I've captured composite video using blackmagic media express.
I'm missing the magic make work button somewhere.
somewhat found the solution, my sources aren't matching. Now I've got the wrong aspect ratio.
Not enough info for me to help.
Update to Wirecast 4.1.
Update Blackmagic drivers to 8.2.
Reboot with camera connected to cards.
Make sure NO other media software is running at all.
Go to Source Settings and select input.