I think Kodi actually uses Milkdrop visualisations but via some other Open Source licensing called Goom or Project M.
If so each visualisation is actually stored as a text file containing its program code – you can even write or edit your own but the code is like a subset of C and involves knowing about hard maths operating in 3 dimensions.
I don’t have the brain for that but at least know one end of a coax cable from the other and a drum of coax + the other bits are way cheaper than distributing HDMI across the house…
With this setup it doesn’t actually matter what software is used; anthing on “display 2” of the laptop (which has been fixed at 720×576 to match an old style TV transmission) will appear on the video output of the de-embedder. in fact any device with an HDMI output will work with it.
if you live in a shared / communal house where these kind of amplifiers are widely used to share the signal from one set of roof antennas/satelite dishes to multiple rooms; it is possible to insert the modulator between the feed from the roof antenna to the distribution amplifier which would mean everyone in the building can watch your “pirate TV station” by retuning their tellies to add the spare analogue channel it uses.
The modulator can be set to any from 21-69 but you need to have a good clear guard space between your signal and the normal digital TV or they cut across each other and no one can watch anything. The good news is there is an army of anoraks in every European nation who publish websites showing all the frequencies in use for each region of the country you are in…
if you do try this (its better to get permission from the building owners/residents first, and avoid experimenting around the times when popular soaps or football are transmitted) take care if you have to enter the roofspace or somewhere like a service cupboard where these kinds of amplifiers are stored or installed.
Sometimes you may have to reduce the strength of the modulator output or the picture is full with snow/lines [which is confusing as it looks like the signal is too weak!] – beware of 1980s era tellies that can backfeed half mains 115V down the outer frame of the antenna socket due to a component inside that should block it failing after time. This isn’t enough to electrocute you but if it bites you when you are up a ladder/in a roofspace can often result in an unplanned descent….
