Ultra HD Blu-ray – Wikipedia

L’ Ultra HD Blu-ray (marketed as 4K Ultra HD ) (UHD-BD) is an optical memory support and is an advanced version of the Blu-ray. Ultra HD Blu-ray discs are not compatible with traditional Blu-ray readers, they support the 4K UHD video format (3840 × 2160 pixel resolution) up to frequencies of 60 progressive frames per second and use high efficiency video coding. The discs support both High-Dynamic-Range (HDR), increasing the depth of the 10-bit color by color, both a range of colors greater than that supported by conventional blue-ray videos.

It is supported on Xbox Series X, Xbox One X and One S of Microsoft and on Sony’s PlayStation 5.

• On January 14, 2013, President Andy Parsons of Blu-ray Disc Association announced that a study group was created to create the specifications for a Blu-Ray format suitable for video productions in 4K (3840 × 2160 pixels) ^[first] .
• On June 2, 2013, an agreement between Sony and Eyeio was announced to use the Eyeio compression technology for the reproduction of 8K video with the extended Gamut XVYCC (the same used by the Ultra HD Blu-Ray format) and saving 50% of space and keeping the H.264 format ^[2] .
• On May 12, 2015, Blu-ray Disc Association officially called the specifications of the Ultra HD Blu-Ray standard. This standard foresees first of all 2 types of optical records: one 66 GB (2 layers), with bits in reading of 108 Mbit/s, and the other of 100 GB (3 layers), with bitrates of 128 Mbit/s. Both discs, designed to support a video resolution of up to 2160p, have the colors space BT.2020, capable of potentially covering 70% of the visible spectrum (the municipal dvd-video municipalities, the 2D and 3D Blu-ray have the Bt.709, which stops at 30%). They also support the new HDR and HFR technologies, the latter to also play videos shot at 48 or 60 frames per second, numbers higher than the classic 24 frames introduced starting from the era of sound cinema. As Codec integrate both the H.264 developed for the Blu-ray, including its AVC MVC evolution developed for 3D Blu-ray, and the H.265 developed for the Ultra High Definition 2160p. To reproduce these discs, new readers and of course 4K televisions will be needed; In addition, both readers and televisions will necessarily have to have version 2.0a of the HDMI connection and version 2.2 of the HDCP protocol. The new Dolby Atmos and DTS: X formats are supported on the audio front. Although the official specifications retain full compatibility with the stereoscopic version of the 1080p high definition films, it is not compulsory: it will be up to individual producers to choose whether or not to implement the ability to reproduce the Blu-ray 3D supports in readers. The Blu-ray Disc Association has in fact taken note of the insuccessive of this technology and has no more interest in it ^[3] , so much so that the 3D for the Ultra HD format is already excluded from the technical specifications and there are no plans for its future implementation of it ^{[4] [5]} .
• On August 24, 2015, Blu-ray Disc Association officially started the Licensing of specifications for the Ultra HD Blu-Ray, so on the one hand, hardware producers will be able to start designing and producing compatible readers with this new standard, and from Another cinematographic houses will be able to start using their respective optical supports for the distribution of content, with the only exception for the 3D version, not supported by the specifications. The Blu-ray Disc Association believes that the timing will allow you to see the first readers and the first titles arrive by the end of the year ^[6] .
• On August 27, 2015, the Consumer Technology Association (CTA) of the United States announced that it has defined an official standard for HDR technology, called HDR10 Media Profile , but better known as HDR10 . Only the products (readers, cables, televisions, monitors and videoprojectors) who will comply with the defined technical requirements can be declared actually compatible with the HDR content, both those reproduced by HDMI 2.0a sources, i.e. the ultra HD Blu-ray supports, and those distributed by internet services ^{[7] [8]} .
• The first Ultra HD Blu-ray compatible reader sold in the United States is the Samsung UBD-K8500 model, marketed starting from February 5, 2016, simultaneously with the release of the first titles ^[9] . However, it was not the first reader ever to arrive on the market, given that on 13 November 2015 in Japan the Panasonic put the DMR-UBZ1 model for sale, a Blu-ray disc recorder capable not only of reading the ultra HD blue supports -Ray but also to record programs for Ultra HD resolution thanks to the presence of an integrated 3 TB hard drive ^[ten] .

• ( IN ) Blu-ray Disc Association . are Blu-raydisc.com . URL consulted on September 15, 2006 (archived by URL Original January 10, 2010) .