Portsdown is a hardware system for DATV: https://wiki.batc.org.uk/Portsdown_2020. I am using the 2019 version, but with vMix. I have tried OBS and Pluto, but without success so far. rtmp and udp don't work here. I am also interested to see the right settings and the proper script for H265. If you are using Pluto, I think you don't need any Portsdown hard- or software, just the right OBS settings. Maybe someone could point us to the right information.
I have an i7/16GB Windows10 . My display cards are AMD Radeon HD 6450 (I have two in the PC)