Can't see the captured images when I used Black Magic Design "DeckLink Mini Recorders"

Hi,

I bought DeckLink Mini Recorders to capture images, but there were problems. What sholud I do?

Please advise ASAP.

・The thing I want to do - To capture 4 HD movies by using OpenCV, 4 DeckLink Mini Recorders and 4 GoProes simultaneously with a PC.

・Phenomenon - Can’t output 4 movies *can see viewers but they output black views.

Even I changed the Gopros setting from HD to 640×480 pixel per inch, I could not see
Also, I tried Blackmagic DeckLink SDK when I used OpenCV,
But when I used WEB cam and USB cameras without DeckLink Mini Recorders, I could see the outputs.

・Spec - PC

Ø OS windows10(64bit)

Ø CPU core-i7 3.40 GHz

Ø Memory : 32GB