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Ultra HD Blu-ray (4K Ultra HD, UHD-BD, or 4K Blu-ray) [2] [3] is a digital optical disc data storage format that is an enhanced variant of Blu-ray. [4] Ultra HD Blu-ray supports 4K UHD (3840 × 2160 pixel resolution) video at frame rates up to 60 progressive frames per second, [4] encoded using High-Efficiency Video Coding. [4]
The CEA definition does allow manufacturers to use other terms—such as 4K—alongside the Ultra HD logo. [ 4 ] : 9 Since the resolution in CEA's definition is only a minimum requirement, displays with higher resolutions such as 4096 × 2160 or 5120 × 2880 also qualify as "Ultra HD" displays, provided they meet the other requirements.
On September 5, 2014, the Blu-ray Disc Association announced that the 4K Blu-ray Disc specification would support HEVC-encoded 4K video at 60 fps, the Rec. 2020 color space, high dynamic range (PQ and HLG), and 10-bit color depth. [87] [88] 4K Blu-ray Discs have a data rate of at least 50 Mbit/s and disc capacity up to 100 GB.
Digital cinema is distinct from high-definition television and does not necessarily use traditional television or other traditional high-definition video standards, aspect ratios, or frame rates. In digital cinema, resolutions are represented by the horizontal pixel count, usually 2K (2048×1080 or 2.2 megapixels ) or 4K (4096×2160 or 8.8 ...
On December 25, 2013, YouTube added a "2160p 4K" option to its videoplayer. Previously, a visitor had to select the "original" setting in the video quality menu to watch a video in 4K resolution. With the new setting, YouTube users can much more easily identify and play 4K videos. [149]
Sony α7S - 4K: 30p/24p, 4:2:2 8 bits. Does not support internal 4K recording, must use an external recorder via HDMI, but see Sony α7S II. Only 1080p is recorded internally. Sony α7S II - Full Frame with internal 4K recording; Sony α7S III; Sony α9 - XAVC S 4K: 3840 x 2160 (30p/25p/24p), 4:2:0 8bit [16] Sony α9 II
This is inconsistent with "4K" denoting approximately 4,000 horizontal pixels, which makes 1920 or 2048 pixels wide the closest to "2K", a label which predates the use of 2560 × 1440. [ 13 ] [ 14 ] Some sources and manufacturers prefer "2.5K" as a term for 2560 × 1440 [ 15 ] to avoid this confusion, and there is a similar "2.7K" ( 2720 × ...
When support for 4K at 60 Hz was added in DisplayPort 1.2, no DisplayPort timing controllers (TCONs) existed which were capable of processing the necessary amount of data from a single video stream. As a result, the first 4K monitors from 2013 and early 2014, such as the Sharp PN-K321, Asus PQ321Q, and Dell UP2414Q and UP3214Q, were addressed ...