Regardless of whether OBS supports a compressed source or not, try to have them uncompressed if at all possible. This will likely require a dedicated video cable run for each (SDI, for example, which runs on the same coax as a TV antenna but with BNC connectors), or high-bandwidth dedicated (wired!) ethernet.
Our two PTZ's have both Cat-5 and Coax run to them, to allow networked control and PoE, and to get a good signal back via the coax. They also have a networked video feed, but we don't use that. Then we have this in the computer:
Specifications Host interface: PCIe 2.0 X4 Transmission bandwidth: Up to 20Gbps Input interface: SDI*4 Compatible development interface: Directsound, Directshow (Windows) Output color space: YUY2 Capture resolution: Resolution within 1080p De-interlacing: Hardware de-interlacing + 3D noise...
www.acasis.com
General page for their capture devices:
Acasis PCIe capture card supports multiple HD resolutions (such as 4K60Hz), bringing crystal-clear visual effects to the audience. It also supports quad HDMI or SDI simultaneous input, allowing you to flexibly adjust between different camera angles or input devices. Solve your professional video...
www.acasis.com
Drivers:
PCIE CAPTURE CARD AC-4HDMI (Quad HDMI-1080P60).zip AC-4SDI (Quad SDI-1080P60).zip AC-4HDMI PLUS (Quad HDMI-1080P60).zip AC-4SDI PLUS (Quad SDI-1080P60).zip AC-VS2583 (2 HDMI-4K60).zip AC-VS2584 (1HDMI+1SDI-1080P60).zip AC-VS007 (Dual HDMI-1080P60).zip AC-VS014 (2HDMI+2SDI-1080P60).zip AC-VS049...
www.acasis.com