UPDATE
After playing around with settings and various options, I could NOT find a way to get the image back where I wanted it. I also realised the RTSP feed was only picking up a single frame and nothing more.
Reading into the options of the RTSP module I wondered if I would utilise WebRTC. So off I went at a complete tangent, and 5 hours of work…
I installed MediaMTX and configured as suggested on a post I found inside this wonderful forum. Nothing! I could not see the stream at all. After lots of head scratching I realised I did not use the default name for my pi (pi) so I had to edit all the configs for MediaMTX and replace the home/pi with my username.
I created an autostart for the MediaMTX service and configured that too.
After lots of confusing back and forth between 2 different websites around the setup for this, one using RTSP stream, but the main one using a RaspberryPi Camera, I was getting close, but the feed was being rejected. I stepped away and had lunch. On my return, it was very obvious. I had used port 553 in the RTSP stream URL, instead of 554. Duh! Rookie mistake, but only spotted when I took a break. This allowed the MediaMTX service to connect to the RTSP stream.
A little bit of jiggerypokery with the config.js file in MagicMirror, and I now have the WEBRTC feed into the Pi and also out to my remote browser on the network. The feed does indeed seem faster and so far, stabled. Time will tell, but I refused to be beaten :)
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