Despite I've been reading all of you and learning as much as possible, I've never posted so this is my first time!
I bought 2 years ago an ambilight system in Aliexpress. It has a rasp, hd capture and arduino (wifi led strip controller). The system works perfect BUT when I activated HDR flickering or wrong colors appeared. Trying to find a solution is how I met this forum. Finally I've found a cheap solution (70€) which is much less than a HDFury.
I have bought a splitter called S104 from Xolorspace. The thing is that if you connect the ps4 as input in HDR and the TV and the capture as output it sends HDR everywhere so the system is not working. The only way to downscale from HDR to nonHDR is having a HDR input and only 1 nonHDR output. According tothis, now I run my ambilight system with 2 splitters. The first one has HDR input and as output the TV + S104 splitter. Then on the S104 I only connect the HD capture from the ambilight. Now everything works perfecr! I can display the ps4 HDR content and enjoy it with the ambilight.
I hope that it helps to the ones trying to find a cheap solution. Thank you very much for your efforts on working with this amazing solution!