About a year ago, I had the Black Magic Intensity Pro 4K working, but abandoned it. Unfortunately I didn't document the settings well, and am now unable to replicate earlier success. There is an older thread that vaguely discusses settings, but includes several capture cards
https://yabb.jriver.com/interact/index.php?topic=92243.0. Thus, here is a thread to specifically document setup of the BM 4K PCI card.
OS: Windows 10
Intensity Pro 4K Driver: 10.11.1
Video settings: for USA
1. Install card and Blackmagic software. Make sure HDMI input cable is in correct port. Make sure HDMI signal is not encrypted.
2. Configure capture card settings in Blackmagic Desktop Video Setup software:
-Video In: HDMI 1080p59.94
-Output Format: 1080p59.94
-All other settings: default
Save and Close.
3. Verify capture card is working. Open Blackmagic Media Express. Select the "Log and Capture" tab. You should be able to see the live HMDI feed. If not, resolve before trying to configure JRiver MC. Close Media Express.
4. Open JRiver MC. Configure television channel for viewing HDMI capture.
-In the top left of the home screen, select the "Television" tab. After selected, notice the option to "Double-click to run television setup." Double-click window.
-Enter your Postal Code. Select "Next".
-Select "Capture only (no channel guide)." Select "Next".
-Select "Camera"
-Select "Blackmagic WDM Capture ....(analog)". Select "Next".
-Ignore "Service type..." window and select "Next".
-Select "Scan". It will find "Camera". After you exit the setup, you should see "Camera" listed under "Channel" in the Television main window.
5. Configure Blackmagic WDM Capture settings.
-Right-click on "Television", select "Manage Devices". "Black magic WDM Capture...(analog)" should be listed at the top. Select "Configure".