The PS5 will be outputting YCbCr as standard via HDMI as it is expecting to be connected to a TV not a monitor. Your splitters may not be capable of full fat 18Gbp signals either. You need to go over each bit of kit tooth and nail to weed out those that are no longer fit for purpose and those that work okay.Yep, everything is 4K.
I didn't think outputting 0-255 would be an issue, cause that can be converted within the media player software.
But I wasn't aware of [email protected] being a problem, I'm now wondering if that's the issue I'm hitting, rather than a cable problem, on the PC anyway. On the PS5 that's a much shorter run but I'm still having issues: PS5 -> Projector works. Chromecast -> Splitter -> Projector works. PS5 -> Splitter -> Projector doesn't work. So it feels like cables individually work, but not when all together.
Change the PC output to YCbCr 8 bit to get a signal and then work up one change at a time to see where it fails, it will be a good pointer.
I am still shuddering at all the cables and boxes involved.
I have my sources to my AVR and then one cable to my projector. Even that can be troublesome!