I've been trying for a couple more days now and can't get it up and running properly. Well, kind of. If I select only one of them it "sort-of" works.
The drivers will install, however it also wants to flash the firmware of the card at the end of it (which will fail because only "half" of the card is really seen in windows..) The provided software for the card will not boot up at all but the single input will work in streaming software such as OBS but I need them both.
IOMMU group 29
[12d8:e130] 02:00.0 PCI bridge: Pericom Semiconductor PCI Express to PCI-XPI7C9X130 PCI-X Bridge (rev 04)
[dada:0150] 03:00.0 Multimedia video controller: Datapath Limited VisionRGB-E2
[dada:0150] 03:04.0 Multimedia video controller: Datapath Limited VisionRGB-E2
Now, I doubt I could split these into two separate IOMMU groups since physically it's one device sitting in one pci-e slot. But yeah it shows up as two separate devices.
I've tried to edit the xml for my windows VM in a couple of different ways but I can only activate either input 1 or input 2. Not both at once. Throws an error that it can't initialize the device because it's already in use.
I've searched so hard on google and on these forums for cases where one pci-e device shows up as two but haven't found anything at all. Maybe this is a unique case? Hoping for some kvm expert to come in and help me out as I can't manage to solve this on my own unfortunately.