Ultraflix mentioned here. Don't know if this been
Post# of 96879
There are also pay-per-view streaming sites with 4K content, like Vudu and UltraFlix™. Not all 4K TVs include built-in apps for these services, so if you're comparing TV models it's worth spending a few minutes to find out which services are supported. YouTube has an eclectic and growing library of millions of 4K video clips. While you probably won't find your favorite movie or TV show, there are a few concerts in 4K, as well as some amazing nature documentary footage. To watch YouTube's 4K content, you'll need a 2015 or newer Ultra HD TV with VP9 decoding.
http://www.crutchfield.com/S-PYLuFfJvblH/lear...nerTrigger
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