Broadcast photo/video from PC to multiple TVs via LAN, how?

Question

Samsung

What we have now:
Twelve TVs, a Windows PC and a bunch of video cards, a local area network (1Gbit) between it all. Seven TVs are connected via HDMI (via ethernet extension cables) to the video card outputs of the computer, which sees them as additional monitors. Slideshows and videos are shown on these seven screens. On the rest - nothing is being broadcast yet (but it should be), they are just on the same local network.
The HDMI scheme suits everyone, except for one thing - after a power failure in the building and turning off / on the screens, they can change their order in Windows. Well, i.e. it was actually monitor1, and became monitor2. Moreover, it is very difficult to predict this - sometimes it changes, sometimes not. How can it be nailed down that this monitor with such an ID is always monitor4?

I tried to broadcast through the Home Media Server, and centralized - in the program on your computer you find a TV by its name, give it a list of videos, press Play - it plays there without having to go there with your feet (it's also DLNA, right?).
Two points:
1. It's not clear how to make a slideshow. What I just did not do - at best, HMS sends pictures to the TV, which it refuses to show ("format not supported" or something like that).
2. After turning off the TV, and just if you switch from the broadcast mode somewhere, the broadcast on the server stops and does not automatically continue. And from the TV itself, launching it every time is a very bad option.

I would also like to get rid of this huge computer with video cards (it takes up a lot of space in the rack). I'm thinking about various hardware and software HDMI-over-IP solutions - in order to run a server in a virtual machine, to which HDMI receivers are connected via IP.

Can someone advise something?

Answer 1

There is HDMI over LAN technology, you can use it. www.startech.com/AV/Extenders/HDMI/HDMI-Video-Over... cheaper than nettops and tydas. Quality OK.