Ultra HD Blu-ray
Ultra HD Blu-ray (marketed as 4K Ultra HD) (UHD-BD), also referred as 4K Blu-ray, is a digital optical disc data storage format that is an enhanced variant of Blu-ray. Ultra HD Blu-ray discs are incompatible with existing standard Blu-ray players (though in most cases, a traditional Blu-ray and digital copy have been packaged with the Ultra HD Blu-ray discs). Ultra HD Blu-ray supports 4K UHD (3840 × 2160 pixel resolution) video at frame rates up to 60 progressive frames per second, encoded using High-Efficiency Video Coding. The discs support both high dynamic range by increasing the color depth to 10-bit per color and a greater color gamut than supported by conventional Blu-ray video by using the Rec. 2020 color space. 4K Blu-rays are supported on Microsoft's Xbox One X, One S, and PlayStation 5, while retail game releases on the Xbox Series X and PlayStation 5 video game consoles may be natively printed onto 100 GB UHD Blu-ray discs.
|Media type||High-density optical disc|
|Encoding||H.265/MPEG-H Part 2 (HEVC)|
|Capacity||50 GB (dual-layer, 92 Mb/s)|
66 GB (dual-layer, 123, 144 Mb/s)
100 GB (triple-layer, 123, 144 Mb/s)
|Block size||2 KB sector, 64 KB block size|
|Read mechanism||405 nm laser|
|Developed by||Blu-ray Disc Association|
|Dimensions||120 mm (4.7 in) diameter|
|Extended from||Standard Blu-ray|
|Released||February 14, 2016|
To differentiate Ultra HD Blu-ray titles on store shelves, the format usually uses a black opaque or slightly transparent keep case packaging format (as opposed to blue).
The specification allows for three disc capacities, each with its own data rate: 50 GB at 72 or 92 Mbit/s, and 66 GB and 100 GB at 92 Mbit/s, 123 or 144 Mbit/s. On 66 GB and 100 GB discs, the pits and lands are not narrower than those of a standard Blu-ray Disc, but shorter, which increases the capacity of each layer from 25 GB to 33 1/3 GB. This also means that each revolution of such a disc transfers more data than a revolution of a standard Blu-ray Disc, which means the transfer rate is higher despite the same linear velocity. In addition, the disc can be encoded to have the drive spin back up to the full 5,000 rpm starting from a point slightly away from the innermost part of the disc if an even higher transfer rate is needed. 50 and 66 GB use two layers, and 100 GB uses three layers. Ultra HD Blu-ray technology was licensed in mid-2015, and players had an expected release date of Christmas 2015. Ultra HD Blu-ray uses a new revision of AACS DRM: AACS 2. In addition, AACS 2.1 is used on certain titles (Stand by Me, Fury, The Patriot, Zombieland).
On May 12, 2015, the Blu-ray Disc Association revealed completed specifications and the official Ultra HD Blu-ray logo. Unlike conventional DVDs and Blu-rays, the new 4K format does not have region coding.
As of January 23, 2018, the BDA spec v3.2 also includes optional support for HDR10+ and Philips/Technicolor's SL-HDR2, also known as Advanced HDR by Technicolor. However, no Ultra HD Blu-ray player has ever supported SL-HDR2, and no discs encoded in SL-HDR2 were ever released.
The first Ultra HD Blu-ray Discs were officially released in the United States on February 14, 2016:
- Sony Pictures Home Entertainment released six titles, The Amazing Spider-Man 2, Salt, Hancock, Chappie, Pineapple Express, and The Smurfs 2.
- Lionsgate Home Entertainment released four titles, Sicario, The Last Witch Hunter, The Expendables 3, and Ender's Game.
- Warner Bros. Home Entertainment released four titles, Mad Max: Fury Road, The Lego Movie, Pan, and San Andreas.
- 20th Century Fox Home Entertainment released seven titles, The Martian, Kingsman: The Secret Service, Exodus: Gods and Kings, Maze Runner: The Scorch Trials, Wild, Hitman: Agent 47, and the 2015 Fantastic Four reboot.
- Paramount Home Entertainment released two titles, Star Trek (2009) and its sequel Into Darkness on June 14, 2016.
- Universal Pictures Home Entertainment released three titles, Lucy, Oblivion, and Lone Survivor on August 9, 2016.
- Walt Disney Studios Home Entertainment released their first title, Guardians of the Galaxy Vol. 2 on August 22, 2017.
- Kino Lorber released their first title, Hannibal on May 7, 2019.
- Synapse Films released their first title, Suspiria on November 19, 2019.
- Shout! Factory released their first title, The Deer Hunter on May 26, 2020.
- However, they did release many IMAX documentaries from 2016 to 2020.
- Blue Underground released their first two titles, Maniac and Zombie on May 26, 2020.
- Arrow Video released their first title, Flash Gordon on August 18, 2020.
- The Criterion Collection will release their first UHD title, Mulholland Drive, on November 16, 2021. Three other titles, Citizen Kane, Menace II Society, and Uncut Gems, will appear the following week.
Other non-American companiesEdit
- Warner Music Group on May 22, 2017, released Sammi Cheng's Touch Mi 2 World Tour, which was officially the world's first live concert released in UHD Blu-ray format in the UK. The concert was the first live show production recorded in 4K format, and the field production and pre-production work was begun in November 2016.
- In the UK, BFI Video will release their very first title, The Seventh Seal on October 18, 2021.
Sales and receptionEdit
Sales of UHD Blu-ray players have been modest compared to older-generation video disc players, based on official US sales data from the Consumer Technology Association (CTA). Peak sales occurred in 2017 with 884,000 units sold, and sales have declined in the years since, as have all disc player sales. Meanwhile, previous generations of disc players sold in excess of four times as many units per year as did UHD Blu-ray.
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