AVS Forum Special Member
Join Date: Mar 2015
Location: Washington (the state)
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For the Auto-Refresh rate, it really depends on your display. Earlier firmware versions didn't play nice on my 4K Samsung. I think that was resolved, but I've moved my Ultra to a 1080 plasma so can't compare. In general I've left the refresh rate off because it impacted MPEG-2 playback in a detrimental way. For the sub-sampling, what I found was again it is display dependent. With my Samsung, 4:2:2 caused color banding, while 4:2:0 was much smoother. Other users report different results, so just try both and see how it looks. For me, it was most noticeable with sky shots.
Samsung JU7100 4K TV, Yamaha RX-V583, Nvidia Shield, a number of Roku players and TVs, Windows 10 media server with Serviio and Plex. Other players and TVs as well.