4K video, content with resolutions at roughly quadruple that of standard 1080p, is all the rage right now. We're finally seeing 4K-res televisions and computer monitors that are at least moderately affordable, and five will get you ten that some mainstream phone manufacturer next year will brag that it's crammed a 4K screen into a 5.5" form factor. YouTube is way ahead of the curve on this one: they've been offering 4K video uploads and playback on compatible hardware since 2010. Now they're expanding that capability to live streaming videos.

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