HDMI is a path, not a promise
A camera HDMI socket can provide playback, menu overlays or a live view with restrictions. Confirm the exact camera mode and connector. Micro-HDMI, mini-HDMI and full-size HDMI need the matching cable; a similar-looking USB port is not an HDMI output.
Look for a clean feed
Remove focus boxes, battery indicators, exposure overlays and menus from the outgoing feed. Check while changing focus and when a face enters the frame. A clean camera screen does not prove the external HDMI feed is clean, and the reverse can also be true.
Test continuous operation
Run the camera at the intended resolution for the full session length with the same power configuration. Sleep timers, thermal behavior and output-mode changes can end a feed. A maker’s compatibility prerequisites are not a substitute for a real session test.
Power while operating
USB power, battery charging and continuous powered operation are separate facts. Some cameras charge while switched off but do not run from that input while producing HDMI. Use the exact approved power arrangement and check that a door or cable does not block the mount.
USB may eliminate a box
A documented UVC mode can send live video directly to the computer. Confirm the mode’s resolution, frame rate and host requirements rather than transferring HDMI specifications. Select that source in OBS and check audio separately if the camera exposes an unwanted built-in microphone.
For the complete connection plan, use the streaming setup builder. You can keep older equipment in your plan.