How did it work out?

I have used multiple blackmagic capture devices before - although not identical ones

these little guys are useful, connects via usb-c/thunderbolt: https://www.blackmagicdesign.c...

depends how many ports the macbook has. if its a new macbook pro you have 4 usbc/thunderbolt ports. what I used to use was an old Ultrastudio thunderbolt plus an old Intensity Shuttle USB3 on a 2015 mbp. Never had issues (well... there are always issues, but not in terms of having multiple blackmagic devices). the blackmagic utility is very useful in letting you configure each device separately.

probably too late but hope this helps

mocke

the website is blocked for me as well... looks like their ssl cert is outdated perhaps.

@woland You could also look at the Blackmagic cleanswitch, it is a bit of a tricky beast as it will work better with reference (or reference SDI input 1). This would give you a clean switching matrix that could be more useful than a simple mixer. I am pretty sure it also uses UDP, if Izzy gets UDP (it's been knocking around on feature requests for a while) then you could control it within Izzy.

I recently bought a Datapath VisionLC HD2 HDMI capture card and I wanted to share my success.

Above you can see it capturing an output from isadora running at 1920*1080 and up-scaling it to 3840*2160 (see below). I have since read it can capture a single HDMI at full 4k - which I will try one day.

The hardware cost £435 which is pretty cool as this can capture DUAL HDMI inputs. So its almost £200 a channel input capture.

Frame delay is minimal but the quality is amazing. 

It's also: 

PCI Express Gen 2 x 4 low profile

And it is indeed low profile! I was very tight on space.

I have done now hardcore testing yet but it works and I will keep you posted on my research.