I best repeat - I'm new to this, but I'm feeling my way around your reply! Ok, so VMS is Video Management Software, and this is seemingly what I was after - a program to provide a PC-operated system. So you reckon using a VMS - even BlueIris - won't provide for H265?
It certainly has rtsp, but apparently not ONVIF. I've had rtsp streaming live on VLC media player. Essentially, all I'm after is a way to record this streamed image on to an HDD.
The camera has an IP Addy, and on the App is an 'NAS/HDD Config' setting which indicates a //192.168.../folder.
Does any of that help me?!