Was trying to use OBS's built in RTMP support but found it a buggy mess that would freeze/drift over time. Ended up using the free version of StreamBridge https://tricube.net/products/stream-bridge/ to convert the RTMP from IP cameras I had to NDI - and from there it worked flawlessly with OBS.
It doesn't look like StreamBridge supports WebRTC, but maybe someone else has a WebRTC to NDI converter that would be similar to StreamBridge? I really hate having the intermediate step, but I like having stable video even more :)
It doesn't look like StreamBridge supports WebRTC, but maybe someone else has a WebRTC to NDI converter that would be similar to StreamBridge? I really hate having the intermediate step, but I like having stable video even more :)