One of the main new features of tvOS 14 is the compatibility with Google’s VP9 codec, which enables 4K streaming on YouTube for Apple TV users. However, although tvOS 14 is now available to the public, users are still unable to play 4K videos on YouTube with a compatible Apple TV.
As noted by MacRumors, the YouTube app on tvOS 14 still limits videos to 1080p resolution, so the 4K option doesn’t show up even with the latest version of the operating system installed. Meanwhile, Apple’s website still mentions that tvOS 14 supports 4K videos on YouTube.
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The official YouTube support later confirmed on Twitter that users will indeed be able to play 4K videos on Apple TV with tvOS 14, but this feature is not yet enabled. Most likely the YouTube app will be updated to be fully compatible with tvOS 14, so users will have to wait a bit longer to get the 4K option.