I agree with
rbk123... I’m also under the opinion that the core of your problem is being caused by the use of cables that
cannot pass the necessary bandwidths and is being compounded by the use of an HDBaseT kit that doesn’t measure up to HDMI 2.0b standards and apparently
does not support
4:2:2 chroma subsampling.
The cables speak for themselves, but here’s why I believe the HDBaseT extender is the “primary" cause of your issue...
Here is the “cut sheet” for your Sony projector. Please notice what I have highlighted. When being sent a 3840x2860 50p UltraHD signal, the projector’s EDID requests that the signal be subsampled to 4:2:2 (a partial chroma unfold) using 10bits of color information per pixel.
So, the signal format your Sony projector is requesting from the source is
3840x2160@50Hz/10bit/4:2:2. This much we can see in the specs below. It now makes perfectly good sense as to why YUV 4:2:0 did
not show up as a viable choice in your Shield’s options.
Now, here comes the big problem. I fully believe that your HDBaseT extender does
not support 4:2:2. The specs for that unit are hard to come by, but from what I can find, it only supports 3840x2160 50/60p at
4:2:0. In this case, it is
not “fully” HDMI 2.0b compliant and will not pass the 4:2:2 signal.
As you can see in this picture, 4:2:2 is not listed in the documentation I found from Blustream.
Here is an example of a “newer” HDBaseT extender and, as I’ve highlighted, you can see that it
does support 4:2:2 at 10bits (which would be compatible with your projector) and
does seem to be fully compliant with the newer HDMI 2.0b specs.
So, with all of this said, I don’t believe you’ll find a resolution to your problem until you’ve replaced your
entire HDMI transport mechanism with a cabling network that can ensure you that it is up to the task and supports the full HDMI 2.0b spec.
Personally, I’m not a huge fan of HDBaseT as there are too many variables that can cause “flakiness” that are difficult to troubleshoot.
When long runs are required (and I personally consider anything longer than 15 feet to be a “long” run), my preference is always a “hybrid” fiber optic HDMI cable. They don’t care how many “bends” are in the path and there’s no over abundance of “twisted pairs” to cause further resistance. IMO, they’re far more reliable than CAT5 or CAT6 cable when it comes to HDMI signal transmission over long distances.
HDMI isn’t like Ethernet, there is no built-in error correction and, therefore, no “packets” are ever resent. HDMI either works or it doesn’t.
So, my best advice is this… Invest in some good (preferably “Premium Certified”) copper HDMI cables that are only long enough to reach between your sources and your RMC-1 (3-6 feet). Then, invest in a good hybrid fiber optic cable that’s long enough to reach your projector from your RMC-1.
I don’t know if Ruipro is sold locally in the UK, but their fiber optic cables are
fantastic. I use one myself and it will pass anything that I throw at it without hesitation or failure.