Decklink Output extremely slow (1f/minute)

Patzag

New Member
Hi. I'm new here, so if there's something I'm not doing right, please go easy! :)

I am running El Capitan, latest version of OBS (27.1) on a Mac Pro 2017.
I am running seminars that are hybrid with attendance and virtual. I use Webex as seminar platform.
The challenge is to display on screen in the auditorium the live webex meeting.
I have a Blackmagic switcher. Connected to my Mac Pro is a PCI expansion chassis loaded with 2 Decklink 4K Pro cards.
I use OBS to channel the Webex window captured through NDI Scan Converter, to the Decklink SDI out.

On my computer, everything looks wonderful. The OBS window shows exactly what I want. Audio is coming in.

But the Decklink Out is VERY slow. There is a lag of nearly 30 seconds and the display refreshes about once or twice a minute only.

Any pointers would be appreciated.
 

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