Can't get unifi camera rtsp stream working with webrtc

I have been experiencing problems with streaming latency using standard camera integration

So installed webrtc which lots of people seem to suggest solves these delays

I have taken the well documented steps to convert RTSPS stream URL to RTSP stream URL

If I use this lovelace configuration I get a display with truncated display and MSE in the corner:

type: custom:webrtc-camera
url: rtsp://<IP>/<KEY>

If I use this lovelace configuration, I get a blank display and “loading”:

type: custom:webrtc-camera
url: rtsp://<IP>/<KEY>
muted: false
mse: false
mode: webrtc

Does anyone have an example of how to get a unifi camera working with webrtc?