Decklink Multi Output?

[WindowsTV]

Hi there,

Hopefully I am posting to the right thread but I am looking to see if OBS supports sending the Program feed out to multiple Decklink SDIs?

Currently I have Blackmagic Desktop Video using each SDI independently. I was wondering it would be possible to have OBS use this functionality to send multiple Program Outputs over those independent SDIs.

 

[BCFischer]

I’m in the same boat and am a little disappointed that OP got no replies on this. OP, did you find a resolution to this issue?

 

[AaronD]

I imagine that few people actually do this, so correspondingly few experts. When I need an SDI signal out from OBS, I use a Projector to feed a normal output of my GPU (usually HDMI), and then hardware-convert that to SDI.

Also, I tried a BM card with 4x SDI - Decklink Duo 2, if I remember correctly - with the idea of having 4x SDI inputs from cameras and remote computers. Even BM support couldn't get it to work. Several unrelated problems, and then I noticed that the available combinations of settings in their config app wouldn't even allow that anyway. So I returned it and got something else.

Normally, I'd recommend one of these for capture-only, as that's what I got and it still works great! But someone on here had a bad experience on my recommendation - apparently they changed some fundamental parts of their driver and broke it - and so I'm not so enthusiastic anymore. But here it is anyway:

ACASIS PCIe Capture Card

Acasis PCIe capture card supports multiple HD resolutions (such as 4K60Hz), bringing crystal-clear visual effects to the audience. It also supports quad HDMI or SDI simultaneous input, allowing you to flexibly adjust between different camera angles or input devices. Solve your professional video...

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ACASIS CAPTURE CARD DRIVERS

PCIE CAPTURE CARD AC-4HDMI (Quad HDMI-1080P60).zip AC-4SDI (Quad SDI-1080P60).zip AC-4HDMI PLUS (Quad HDMI-1080P60).zip AC-4SDI PLUS (Quad SDI-1080P60).zip AC-VS2583 (2 HDMI-4K60).zip AC-VS2584 (1HDMI+1SDI-1080P60).zip AC-VS007 (Dual HDMI-1080P60).zip AC-VS014 (2HDMI+2SDI-1080P60).zip AC-VS049...

www.acasis.com

 

[BCFischer]

Thanks Aaron! I was looking at the BM manual and noting that the product description (although, I’m sure, technically correct) suggests much more flexibility than the product provides. SDI 1 does exactly what I hoped it might, but the remaining ports don’t seem to be good for much more than input and loop out.

My workflow is a Decklink Pro with SDI 1 sending the OBS program feed to a 4k Web Presenter.

My 2 cameras are on NDI. I might switch them over to SDI to see if I can bring latency 700-800ms under control. I’d still use the Ethernet runs for control and POE.

I think I can free up an HDMI to run our remote monitors, which I was planning for one of the other SDI outs.

 

[AaronD]

My 2 cameras are on NDI. I might switch them over to SDI to see if I can bring latency 700-800ms under control. I’d still use the Ethernet runs for control and POE.

Ouch! Almost a full second behind? That's gotta be annoying!

I have two PTZ cameras in a church rig. Both are powered and controlled with PoE, and both have an RTSP feed but not NDI. So they each have a dedicated SDI run as well. Direct from the cameras to the 4x SDI capture that I mentioned previously. Technically, the latency is visible, comparing OBS's display to looking directly over the monitor, but I have to look for it.

This is on Ubuntu Studio Linux, which has a special low-latency kernel. So it responds quicker to things that need it. That probably helps too.

Ubuntu Studio – A free and open operating system for creative people.

ubuntustudio.org