Reolink stream quality differs depending on iOS App and PC browser

Hi HA Community,

I have three quite old HIKVision PoE Cameras. All of them provide fluent streams via RTSP integration. Recently I bought a Reolink TrackMix PoE (P760). A great device which I really love. However, so far I was unable to configure decent fluid video streams for the main and zoom lenses.
My home is connected via fiber so the bandwidth should be given.
Something very strange a I discovered just a few days ago.
It seems that the Reolink streams are particularly poor using the iOS HA App. When I connect via a web browser from the same network (outside of my home net) the streams appear a lot more stable and fluid. Does that make sense to anybody?

Advice appreciated…

solved: # Solved: Reolink H.265 → H.264 Transcoding in go2rtc - Complete Working Guide - #2 by Klonk0