720p4K

720p4K is not a standard or recognized video resolution. The term appears to combine two distinct and incompatible resolutions. 720p refers to a resolution of 1280 pixels wide by 720 pixels tall, commonly known as "HD" or "half-HD." This resolution is characterized by progressive scan, indicated by the "p."

In contrast, 4K, also known as UHD (Ultra High Definition), typically refers to a resolution of 3840 pixels wide by 2160 pixels tall. There is also a cinema standard 4K resolution of 4096 pixels wide by 2160 pixels tall. The numerical value in these resolutions (720 and 4K) indicates the approximate number of vertical pixels.

Combining these terms as "720p4K" is therefore a contradiction. It's possible this term is used informally, perhaps to describe a situation where a 4K video is being downscaled or displayed at a lower resolution that is still higher than 720p, or as a misunderstanding of video terminology. However, in professional video production, broadcasting, or display technology, "720p4K" does not denote a specific or definable video format. Standard resolutions are clearly defined, such as 720p, 1080p (Full HD), 1440p (QHD), and 2160p (4K UHD).