[wesk05]

I'd be disappointed if the Shield didn't support 4:2:0 2160/60p and 50p - it's the only 2160/50p and 60p mode that quite a few HDMI 2.0 UHD TVs support - including mainstream Sony (and I think Samsung) models. They don't support 4:4:4 or 4:2:2 at 2160/60p or 50p. (Presumably because they are only support the HDMI 2.0 4:2:0 mode which fits into HDMI 1.4 bandwidth limits? nVidia support 4:2:0 2160/50p and 60p on their otherwise-HDMI 1.4a Kepler/Maxwell based video cards with recent Windows and Linux drivers so that may be hopeful.)

Kodi Wiki for the SHIELD states that it does support 4:2:0 chroma subsampling. It is also mentioned in the release notes for 1.1 update. So, it looks like there shouldn't be any problem using the splitters. One another point that I overlooked is UHD Blu-ray spec is actually only 4:2:0. That is likely to be the source for more than 90% of 4K content.

Several 2015 Samsung 4K TVs have 4K 60Hz 4:4:4. Some Panasonic models also have it. None of the Sony models support 4:4:4.