The generally adopted HDMI options are these I think:
RGB to rgbScart converter box to HDMI
RGBTOHDMI
My issue is that both these HDMI options are around £50, when I have no idea how much I will be playing with this it's alot for me just to get started. The route I have found is a little different so I thought I would share here. I have a old box pc set up with linux hooked up via a kvm switch to my monitor. I decided I would be able to use the composite on a TV/capture card as input. So I bought the cheapest PCI TV card on ebay, a Pinnacle DVB at £5.50 delivered which has RF, composite and S-Video inputs. If I say so myself, it works great with no noticable latency (so far)!
Here's the set up using the composite:
install v4l-utils and mpv, I did both through the distro package manager.
https://www.linuxtv.org/
https://mpv.io/
set the TV / capture card input to the composite with
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v4l2-ctl -d /dev/video0 -i 2
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mpv av://v4l2:/dev/video0 --profile=low-latency --untimed --osc=no --vf=format=fmt=gray
There are keyboard shortcuts such as 'f' to toggle full screen and 's' to take a screen shot.
As a bonus, capture is also possible! To save to 'myvideocapture.mkv' use:
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mpv --stream-record=./myvideocapture.mkv av://v4l2:/dev/video0 --profile=low-latency --untimed --vf=format=fmt=gray --osc=no
I'm thinking of trying the colour composite mod and experimenting with s-video as well...