Pixelation RTSPtoWebRTC

[vaguy]

Hi
I’m new to Go and WebRTC
I am using RTSPtoWebRTC (utilizes Pion WebRTC) to live stream an RTSP capable camera to a Chrome browser.
I’m running Go, RTSPtoWebRTC and Chrome all on the same Windows 10 PC. CPU usage is very low.
My RTSP camera stream is 1280x720 over a Wifi connection. Bbitrate is set to 5000, no audio,
framerate is 15, Videoformat is VBR, Audioformat is OFF
The WebRTC browser video display size is 1280x720.
Simultaneously I’m using VLC on the same Windows 10 PC to view the RTSP stream.
The VLC viewer is picture perfect, no issues.
The WebRTC stream as viewed in Chrome is pixelating, typically within the bottom half of the image. Seems worse during daylight hours. Same issue with Microsoft Edge.
If I back off the RTSP stream to 640x320 but leave the WebRTC video display size at 1280x720, there is a 99% reduction is pixilation issues.
Conversely, if the RTSP stream is set to 1280x720 and the WebRTC video display size set at and 640x320 or even 320x160, pixilation remains

Go 1.15.6
Git 2.30.0
RTSPtoWebRTC 39053c7
Pion WebRTC that was auto-installed when building RTSPtoWebRTC shows v3@v3.0.1

All attached images have been reduced to 25%
The green areas at the bottom of the video are typically only seen at startup and disappear after a minute or so.

Any advice on how I might debug this? Are there any tweaks to parameter settings within Pion or RTSPtoWebRTC or to my camera’s RTSP settings that I could try?

Thanks