When I try to use the DeckLink Duo 2 card, I am having trouble accessing some of the inputs through the SDK. I'm on a Linux CentOS 7.5 system using Blackmagic DeckLink SDK 10.11.4.
I create an IDeckLinkIterator, and iterate through the IDeckLink objects and I find 2. Each of these has an input, and I'm able to get video and audio through these 2.
However, the card itself has 4 input ports - why do I only see 2?
On a similar note, does this act as two cards? I see 2 of these on the PCI bus:
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$ lspci | grep Blackmagic
03:00.0 Multimedia video controller: Blackmagic Design DeckLink SDI/Duo/Quad
04:00.0 Multimedia video controller: Blackmagic Design DeckLink SDI/Duo/Quad
In a similar vein I have a system with a DeckLink SDI 4K card in it. I see only 1 channel for it, and one device on the PCI bus - and it's oddly, the same device. Like so:
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$ lspci | grep Blackmagic
01:00.0 Multimedia video controller: Blackmagic Design DeckLink SDI/Duo/Quad
Can I get some direction?