YouTube 4K support arrives on Comcast X1 boxes

Engadget ---------- If you have a compatible Comcast Xfinity X1 setup, you might be pleased to learn you can watch YouTube videos in 4K resolution through your cable box as of Monday. Netflix and (as of this month) Amazon Prime Video were already available on X1 in 4K, so it's nice to see support for ultra high-resolution on YouTube, which has a large library of 4K videos. To learn more click on the picture below to read the article.