Early historyThe information density of the format was limited by the wavelength of the s used. Following protracted development, diodes operating at 405 s became available on a production basis, allowing for development of a more-dense storage format that could hold higher-definition media, with prototype discs made with diodes at a slightly longer wavelength of 407 nanometers in October 1998. started two projects in collaboration with , , and , applying the new diodes: (Ultra Density Optical), and DVR Blue (together with ), a format of rewritable discs that would eventually become Blu-ray Disc (more specifically, BD-RE). The core technologies of the formats are similar. The first DVR Blue prototypes were unveiled by Sony at the exhibition in October 2000. A trademark for the "Blue Disc" logo was filed on February 9, 2001. On February 19, 2002, the project was officially announced as Blu-ray Disc, and Blu-ray Disc Founders was founded by the nine initial members. The first consumer device arrived in stores on April 10, 2003: the Sony BDZ-S77, a US$3,800 BD-RE recorder that was made available only in Japan. However, there was no standard for prerecorded video, and no movies were released for this player. Hollywood studios insisted that players be equipped with before they would release movies for the new format, and they wanted a new DRM system that would be more secure than the failed (CSS) used on DVDs. On October 4, 2004, the name "Blu-ray Disc Founders" was officially changed to the (BDA), and joined the BDA's Board of Directors. The Blu-ray Disc physical specifications were completed in 2004. In January 2005, TDK announced that it had developed an ultra-hard yet very thin polymer coating (" ") for Blu-ray Discs; this was a significant technical advance because a far tougher protection was desired in the consumer market to protect bare discs against scratching and damage compared to DVD, while technically Blu-ray Disc required a much ''thinner'' layer for the denser and higher-frequency blue laser. Cartridges, originally used for scratch protection, were no longer necessary and were scrapped. The BD-ROM specifications were finalized in early 2006. Advanced Access Content System Licensing Administrator (AACS LA), a consortium founded in 2004, had been developing the DRM platform that could be used to securely distribute movies to consumers. However, the final AACS standard was delayed, and then delayed again when an important member of the Blu-ray Disc group voiced concerns. At the request of the initial hardware manufacturers, including Toshiba, Pioneer, and Samsung, an interim standard was published that did not include some features, such as managed copy.
Launch and sales developmentsThe first BD-ROM players (Samsung BD-P1000) were shipped in mid-June 2006, though players beat them to market by a few months. The first Blu-ray Disc titles were released on June 20, 2006: '' '', '' '', '' Hitch'', '' '', '' Underworld: Evolution'', '' xXx'' (all from Sony), and 's '' ''. The earliest releases used video compression, the same method used on standard DVDs. The first releases using the newer and AVC formats were introduced in September 2006. The first movies using 50 GB dual-layer discs were introduced in October 2006. The first audio-only albums were released in May 2008. By June 2008, over 2,500 Blu-ray Disc titles were available in Australia and the United Kingdom, with 3,500 in the United States and Canada. In Japan, over 3,300 titles have been released as of July 2010.
Competition from HD DVDThe , chaired by , was split over whether to develop the more expensive blue laser technology. In March 2002 the forum approved a proposal, which was endorsed by and other motion picture studios. The proposal involved compressing onto dual-layer standard DVD-9 discs. In spite of this decision, however, the DVD Forum's Steering Committee announced in April that it was pursuing its own blue-laser high-definition video solution. In August, Toshiba and announced their competing standard, the Advanced Optical Disc. It was finally adopted by the DVD Forum and renamed the next year, after being voted down twice by DVD Forum members who were also Blu-ray Disc Association members—a situation that drew preliminary investigations by the U.S. Department of Justice. HD DVD had a head start in the high-definition video market, as Blu-ray Disc sales were slow to gain market share. The first Blu-ray Disc player was perceived as expensive and buggy, and there were few titles available. The Sony , which contained a Blu-ray Disc player for primary storage, helped support Blu-ray. Sony also ran a more thorough and influential marketing campaign for the format. camcorders were also introduced in 2006. These recordings can be played back on many Blu-ray Disc players without re-encoding but are not compatible with HD DVD players. By January 2007, Blu-ray Discs had outsold HD DVDs, and during the first three quarters of 2007, BD outsold HD DVD by about two to one. At CES 2007, Warner proposed Total Hi Def—a hybrid disc containing Blu-ray on one side and HD DVD on the other, but it was never released. On June 28, 2007, cited Blu-ray Disc's adoption of the BD+ anticopying system as key to their decision to support the Blu-ray Disc format. On January 4, 2008, a day before 2008, Warner Bros. (the only major studio still releasing movies in both HD DVD and Blu-ray Disc format) announced that it would release only in Blu-ray Disc after May 2008. This effectively included other studios that came under the Warner umbrella, such as and —though in Europe, HBO's distribution partner, the , announced it would, continue to release product on both formats while keeping an eye on market forces. This led to a chain reaction in the industry, with major American retailers such as , , and and Canadian chains such as dropping HD DVD in their stores. , then a major European retailer, dropped HD DVD from its inventory. Major companies and said they would no longer carry HD DVD. Following these new developments, on February 19, 2008, Toshiba announced it would end production of devices, allowing Blu-ray Disc to become the industry standard for high-density optical discs. , the sole major studio to back HD DVD since its inception, said shortly after Toshiba's announcement: "While Universal values the close partnership we have shared with Toshiba, it is time to turn our focus to releasing new and catalog titles on Blu-ray Disc." , which started releasing movies only in HD DVD format during late 2007, also said it would start releasing on Blu-ray Disc. Both studios announced initial Blu-ray lineups in May 2008. With this, all major Hollywood studios supported Blu-ray.
Future scope and market trendsAccording to Media Research, high-definition software sales in the United States were slower in the first two years than DVD software sales. 16.3 million DVD software units were sold in the first two years (1997–1998) compared to 8.3 million high-definition software units (2006–2007). One reason given for this difference was the smaller marketplace (26.5 million HDTVs in 2007 compared to 100 million SDTVs in 1998). Former HD DVD supporter did not make a Blu-ray Disc drive for the . The 360's successor Xbox One features a Blu-ray drive, as does the PS4, with both supporting 3D Blu-ray after later firmware updates. Shortly after the "format war" ended, Blu-ray Disc sales began to increase. A study by the found that awareness of Blu-ray Disc had reached 60% of households in the United States. Nielsen VideoScan sales numbers showed that for some titles, such as 20th Century Fox's ''Hitman'', up to 14% of total disc sales were from Blu-ray, although the average Blu-ray sales for the first half of the year were only around 5%. In December 2008, the Blu-ray Disc version of Warner Bros.' '' The Dark Knight'' sold 600,000 copies on the first day of its launch in the United States, Canada, and the United Kingdom. A week after the launch, ''The Dark Knight'' BD had sold over 1.7 million copies worldwide, making it the first Blu-ray Disc title to sell over a million copies in the first week of release. According to AG, Blu-ray was adopted faster than the DVD format was at a similar period in its development. This conclusion was based on the fact that Singulus Technologies received orders for 21 Blu-ray dual-layer replication machines during the first quarter of 2008, while 17 DVD replication machines of this type were made in the same period in 1997. According to GfK Retail and Technology, in the first week of November 2008, sales of Blu-ray recorders surpassed DVD recorders in Japan. According to the Digital Entertainment Group, the number of Blu-ray Disc playback devices (both set-top box and game console) sold in the United States had reached 28.5 million by the end of 2010. Blu-ray faces competition from and from new technologies that allow access to movies on any format or device, such as or Disney's Keychest. Some commentators suggested that renting Blu-ray would play a vital part in keeping the technology affordable while allowing it to move forward. In an effort to increase sales, studios began releasing films in combo packs with Blu-ray Discs and DVDs, as well as that can be played on computers and mobile devices. Some are released on "flipper" discs with Blu-ray on one side and DVD on the other. Other strategies are to release movies with the special features only on Blu-ray Discs and none on DVDs. Blu-ray discs cost no more to produce than DVD discs. However, reading and writing mechanisms are more complicated, making Blu-ray recorders, drives and players more expensive than their DVD counterparts. Adoption is also limited due to the widespread use of streaming media. Blu-ray discs are used to distribute , , , and games, and the aforementioned game consoles can play back regular Blu-ray discs.
Beyond Blu-raydiscs and players became available in the first quarter of 2016, having a storage capacity of up to 100 GB. The (HVD), described in the ECMA-377 standard, has been in development by the Holography System Development (HSD) Forum using a green writing/reading laser (532 nm) and a red positioning/addressing laser (650 nm). It is to offer MPEG-2, MPEG-4 AVC (H.264), (H.265), and VC-1 encoding, supporting a maximum storage capacity of 6TB. No systems conforming to the HVD standard have been released. Because the Blu-ray Disc format is upgradable it poses challenges to the adoption of the HVD format.
Ongoing developmentAlthough the Blu-ray Disc specification has been finalized, engineers continue to work on advancing the technology. By 2005, quad-layer (100 GB) discs had been demonstrated on a drive with modified optics and standard unaltered optics. Hitachi stated that such a disc could be used to store 7 hours of 32 Mbit/s video (HDTV) or 3 hours and 30 minutes of 64 Mbit/s video ( ). In April 2006, TDK canceled plans to produce 8-layer 200GB Blu-ray Discs. In August 2006, TDK announced that it had created a working experimental Blu-ray Disc capable of holding 200 GB of data on a single side, using six 33 GB data layers. In 2007, Hitachi was reported to have plans to produce 200 GB disks by 2009. Behind closed doors at 2007, revealed that it had successfully developed a high-definition optical disc process that extended the disc capacity to ten layers, increasing the capacity of the discs to 250 GB. However, it noted the major obstacle was that current read/write technology did not allow additional layers. developed a three-layer technology that allows putting both standard-definition DVD data and HD data on a BD/(standard) DVD combination. This would have enabled the consumer to purchase a disc that can be played on DVD players and can also reveal its HD version when played on a BD player. Japanese optical disc manufacturer Infinity announced the first "hybrid" Blu-ray Disc/(standard) DVD combo, to be released February 18, 2009. This disc set of the TV series "Code Blue" featured four hybrid discs containing a single Blu-ray Disc layer (25 GB) and two DVD layers (9 GB) on the same side of the disc. In January 2007, showcased a 100 GB Blu-ray Disc, consisting of four layers containing 25 GB each. It claimed that, unlike TDK's and 's 100 GB discs, this disc would be readable on standard Blu-ray Disc drives that were currently in circulation, and it was believed that a firmware update was the only requirement to make it readable by then-current players and drives. In October 2007 they revealed a 100GB Blu-ray disc drive. In December 2008, unveiled a 400 GB Blu-ray Disc (containing 16 data layers, 25 GB each) compatible with current players after a firmware update. Its planned launch was in the 2009–10 time frame for ROM and 2010–13 for rewritable discs. Ongoing development was underway to create a 1 TB Blu-ray Disc. At CES 2009, Panasonic unveiled the DMP-B15, the first portable Blu-ray Disc player, and introduced the LC-BD60U and LC-BD80U series, the first LCD HDTVs with integrated Blu-ray Disc players. Sharp also announced that it would sell HDTVs with integrated Blu-ray Disc recorders in the United States by the end of 2009. Set-top box recorders were not being sold in the U.S. for fear of unauthorized copying. However, personal computers with Blu-ray recorder drives were available. In October 2009, TDK demonstrated a 10-layer 320GB Blu-ray disc. On January 1, 2010, Sony, in association with Panasonic, announced plans to increase the storage capacity on their Blu-ray Discs from 25 GB to 33.4 GB via a technology called i-MLSE ( Sequence Estimation). The higher-capacity discs, according to Sony, would be readable on existing Blu-ray Disc players with a firmware upgrade. This technology was later used on BDXL discs. On July 20, 2010, the research team of Sony and Japanese Tohoku University announced the joint development of a blue-violet laser, to help create Blu-ray Discs with a capacity of 1 TB using only two layers (and potentially more than 1 TB with additional layering). By comparison, the first blue laser was invented in 1996, with the first prototype discs coming four years later. On January 7, 2013, Sony announced that it would release "Mastered in 4K" Blu-ray Disc titles sourced at 4K and encoded at 1080p. "Mastered in 4K" Blu-ray Disc titles can be played on existing Blu-ray Disc players and have a larger using . On January 14, 2013, Blu-ray Disc Association president Andy Parsons stated that a task force was created three months prior to conduct a study concerning an extension to the Blu-ray Disc specification that would add the ability to contain 4K Ultra HD video. On August 5, 2015, the (BDA) announced it would commence licensing the starting on August 24, 2015. The Ultra HD Blu-ray format delivered high dynamic range content that significantly expanded the range between the brightest and darkest elements, expanded color range, high frame rate (up to 60fps) and up to 3840×2160 resolution, object-based sound formats, and an optional "digital bridge" feature. New players were required to play this format, which were able to play both DVDs, traditional Blu-rays and the new format. New Ultra HD Blu-ray Discs hold up to 66 GB and 100 GB of data on dual- and triple-layer discs, respectively. Blu-ray's physical and file system specifications are publicly available on the Blu-ray disc association's website.
Laser and opticsWhile a uses a 650 nm red laser, Blu-ray Disc uses a 405 nm " " . Although the laser is called "blue", its color is actually in the range. The shorter wavelength can be focused to a smaller area, thus enabling it to read information recorded in pits that are less than half the size of those on a DVD, and can consequently be spaced more closely, resulting in a shorter track pitch, enabling a Blu-ray Disc to hold about five times the amount of information that can be stored on a DVD. The lasers are GaN (gallium nitride) laser diodes that produce 405 nm light directly, that is, without Second-harmonic generation, frequency doubling or other Nonlinear optics, nonlinear optical mechanisms. Compact Disc, CDs use 780 nm near-infrared lasers. The minimum "Angular resolution, spot size" on which a laser can be focused is limited by diffraction and depends on the wavelength of the light and the numerical aperture of the lens (optics), lens used to focus it. By decreasing the wavelength, increasing the numerical aperture from 0.60 to 0.85, and making the cover layer thinner to avoid unwanted optical effects, designers can cause the laser beam to focus on a smaller spot, which effectively allows more information to be stored in the same area. For a Blu-ray Disc, the spot size is 580 nm. This allows a reduction of the pit size from 400 nm for DVD to 150 nm for Blu-ray Disc, and of the track pitch from 740 nm to 320 nm. See ''compact disc'' for information on optical discs' physical structure. In addition to the optical improvements, Blu-ray Discs feature improvements in data encoding that further increase the amount of content that can be stored.
Hard-coating technologyGiven that the Blu-ray Disc data layer is closer to the surface of the disc compared to the standard, it was found in early designs to be more vulnerable to scratches. The first discs were therefore housed in Caddy (hardware), cartridges for protection, resembling Professional Discs introduced by Sony in 2003. Using a cartridge would increase the price of an already expensive medium, and would increase the size of Blu-ray disc drives, so designers chose hard-coating of the pickup surface instead. TDK was the first company to develop a working scratch-protection coating for Blu-ray Discs, naming it . In addition, both Sony's and Panasonic's replication methods include proprietary hard-coat technologies. Sony's rewritable media are spin-coated, using a scratch-resistant acrylic and antistatic coating.http://www.blu-raydisc.com/Assets/Downloadablefile/White_Paper_General_5th_20180216.pdf Mitsubishi Kagaku Media, Verbatim's recordable and rewritable Blu-ray Discs use their own proprietary technology, called Hard Coat. Colloidal silica-dispersed UV-curable resins are used for the hard coating, given that, according to the Blu-ray Disc Association, they offer the best tradeoff between scratch resistance, optical properties, and productivity. The Blu-ray Disc specification requires the testing of resistance to scratches by Abrasion (mechanical), mechanical abrasion. In contrast, DVD media are not required to be scratch-resistant, but since development of the technology, some companies, such as Verbatim, implemented hard-coating for more expensive lines of recordable DVDs.
Drive speedsThe table shows the speeds available. Even the lowest speed (1×) is sufficient to play and record real-time 1080p video; the higher speeds are relevant for general data storage and more sophisticated handling of video. BD discs are designed to cope with at least 5,000rpm of rotational speed. The usable data rate of a Blu-ray Disc drive can be limited by the capacity of the drive's data interface. With a USB 2.0 interface, the maximum exploitable drive speed is 288 Mbit/s or 36 MB/s (also called 8× speed). A USB 3.0 interface (with proper cabling) does not have this limitation, nor do even the oldest version of Serial ATA (SATA, 150 MB/s) nor the latest Parallel ATA (133 MB/s) standards. Internal Blu-ray drives that are integrated into a computer (as opposed to physically separate and connected via a cable) typically have a SATA interface. More recent Optical disc drive#Form factors, half-height Blu-Ray writers have reached writing speeds of up to 16× (constant angular velocity) on single-layer BD-R media, while the highest reading speeds are 12×, presumably to prevent repeated physical stress on the disc. Optical disc drive#Form factors, Slim type drives are limited to 6× speeds (constant angular velocity) due to spacial and power limitations.Pioneer computer drive archive
Media quality and data integrityThe quality and data integrity of optical media can be determined by Optical disc#Surface error scanning, measuring the rate of errors, of which higher rates may be an indication for Disc rot, deteriorating media, low-quality media, physical damage such as scratches, dust, and/or media written using a defective optical drive. Errors on Blu-Ray media is measured using the so-called ''LDC'' (''Long Distance Code''s) and ''BIS'' (''Burst Indication Subcode''s) error parameters, of which rates below 13 and 15 respectively can be considered healthy. Not all vendors and models of optical drives have error scanning functionality implemented.
PackagingPre-recorded Blu-ray Disc titles usually ship in packages similar to but slightly smaller (18.5 mm shorter and 2 mm thinner: 135 mm × 171.5 mm × 13 mm), as well as more rounded than a standard Optical disc packaging#Keep case, keep case, generally with the format prominently displayed in a horizontal stripe across the top of the case (translucent blue for Blu-ray video discs, clear for Blu-ray 3D video releases, red for PlayStation 3 Greatest Hits Games, transparent for regular PlayStation 3 games, transparent dark blue for PlayStation 4 and PlayStation 5 games, transparent green for Xbox One and Xbox Series X games and black for Ultra HD Blu-ray video releases). Warren Osborn and The Seastone Media Group, LLC created the package that was adopted worldwide following the Blu-ray versus HD DVD market adoption choice. Because Blu-ray cases are smaller than DVD cases, more Blu-rays than DVDs can fit on a Shelf (storage), shelf.
Mini Blu-ray DiscThe "Mini Blu-ray Disc" (also, "Mini-BD" and "Mini Blu-ray") is a compact variant of the Blu-ray Disc that can store 7.8 GB of data in its single-layer configuration, or 15.6 GB on a dual-layer disc. It is similar in concept to the MiniDVD and Mini CD, MiniCD. Recordable (BD-R) and rewritable (BD-RE) versions of Mini Blu-ray Disc have been developed specifically for compact camcorders and other compact recording devices.
Blu-ray Disc recordable"Blu-ray Disc recordable" (BD-R) refers to two formats that can be recorded with an optical disc drive, optical disc recorder. BD-Rs can be written to once, whereas Blu-ray Disc Recordable Erasable (BD-REs) can be erased and re-recorded multiple times. The current practical maximum speed for Blu-ray Discs is about 12× (54 MB/s). Higher speeds of rotation (5,000+ rpm) cause too much wobble for the discs to be written properly, as with the 24× (33.2 MB/s) and 56× (8.2 MB/s, 11,200 rpm) maximum speeds, respectively, of standard s and Compact Disc, CDs. Since September 2007, Blu-ray Disc recordable, BD-RE is also available in the smaller 8 cm Mini Blu-ray Disc size. On September 18, 2007, and Mitsubishi codeveloped BD-R LTH ("Low to High" in groove recording), which features an organic compound, organic dye recording layer that can be manufactured by modifying existing CD-R and DVD-R production equipment, significantly reducing manufacturing costs. In February 2008, Taiyo Yuden, Mitsubishi, and Hitachi Maxell, Maxell released the first BD-R LTH Discs, and in March 2008, Sony's PlayStation 3 officially gained the ability to use BD-R LTH Discs with the 2.20 firmware update. In May 2009 Verbatim/Mitsubishi announced the industry's first 6X BD-R LTH media, which allows recording a 25 GB disc in about 16 minutes. Unlike with the previous releases of 120 mm s (i.e. compact disc, CDs and standard s), Blu-ray recorders hit the market almost simultaneously with Blu-ray's debut.
BD9 and BD5The BD9 format was proposed to the Blu-ray Disc Association by Warner Home Video as a cost-effective alternative to the 25/50 GB BD-ROM discs. The format was supposed to use the same codecs and program structure as Blu-ray Disc video but recorded onto less expensive 8.5 GB dual-layer DVD. This red-laser media could be manufactured on existing DVD production lines with lower costs of production than the 25/50 GB Blu-ray media. Usage of BD9 for releasing content on "pressed" discs never caught on. With the end of the format war, manufacturers ramped production of Blu-ray Discs and lowered prices to compete with DVDs. On the other hand, the idea of using inexpensive DVD media became popular among individual users. A lower-capacity version of this format that uses single-layer 4.7 GB DVDs has been unofficially called BD5. Both formats are being used by individuals for recording high-definition content in Blu-ray format onto recordable DVD media. Despite the fact that the BD9 format has been adopted as part of the BD-ROM basic format, none of the existing Blu-ray player models explicitly claim to be able to read it. Consequently, the discs recorded in BD9 and BD5 formats are not guaranteed to play on standard Blu-ray Disc players. and AVCREC also use inexpensive media like DVDs, but unlike BD9 and BD5 these formats have limited interactivity, codec types, and data rates. As of March 2011, BD9 was removed as an official BD-ROM disc.
BDXLThe BDXL format allows 100 GB and 128 GB write-once discs, and 100 GB rewritable discs for commercial applications. The BDXL specification was finalised in June 2010 but the first 128 GB quad-layer discs were not released until November 2018, and these discs are currently sold only in Japan. BD-R 3.0 Format Specification (BDXL) defined a multi-layered disc recordable in BDAV format with the speed of 2× and 4×, capable of 100/128 GB and usage of UDF2.5/2.6. BD-RE 4.0 Format Specification (BDXL) defined a multi-layered disc rewritable in BDAV with the speed of 2× and 4×, capable of 100 GB and usage of UDF2.5 as file system. Although the 66 GB and 100 GB BD-ROM discs used for Ultra HD Blu-ray use the same linear density as BDXL, the two formats are not compatible with each other, therefore it is not possible to use a triple layer BDXL disc to burn an Ultra HD Blu-ray disc playable in an Ultra HD Blu-ray player.
IH-BDThe IH-BD (Intra-Hybrid Blu-ray) format includes a 25 GB rewritable layer (BD-RE) and a 25 GB write-once layer (BD-ROM), designed to work with existing Blu-ray Discs.
Data format standards
FilesystemBlu-ray Disc specifies the use of Universal Disk Format (UDF) 2.50 as a convergent-friendly format for both PC and consumer electronics environments. It is used in the latest specifications of BD-ROM, BD-RE, and BD-R. In the first BD-RE specification (defined in 2002), the BDFS (Blu-ray Disc File System) was used. The BD-RE 1.0 specification was defined mainly for the digital recording of high-definition television (HDTV) Terrestrial television, broadcast television. The BDFS was replaced by UDF 2.50 in the second BD-RE specification in 2005, in order to enable interoperability among consumer electronics Blu-ray recorders and personal computer systems. These optical disc recording technologies enabled PC recording and playback of BD-RE. BD-R can use UDF 2.50/2.60. The Blu-ray Disc application for recording of digital broadcasting has been developed as ''System Description Blu-ray Rewritable Disc Format part 3 Audio Visual Basic Specifications'' (BDAV). The requirements related with computer file system have been specified in ''System Description Blu-ray Rewritable Disc Format part 2 File System Specifications version 1.0'' (BDFS). Initially, the BD-RE version 1.0 (BDFS) was specifically developed for recording of digital broadcasts using the Blu-ray Disc application (BDAV application). But these requirements are superseded by the ''Blu-ray Rewritable Disc File System Specifications version 2.0'' (UDF) (a.k.a. ''RE 2.0'') and ''Blu-ray Recordable Disc File System Specifications version 1.0'' (UDF) (a.k.a. ''R 1.0''). Additionally, a new application format, BDMV (''System Description Blu-ray Disc Prerecorded Format part 3 Audio Visual Basic Specifications'') for High Definition Content Distribution was developed for BD-ROM. The only file system developed for BDMV is the ''System Description Blu-ray Read-Only Disc Format part 2 File System Specifications version 1.0'' (UDF) which defines the requirements for UDF 2.50.
Application format* BDAV or BD-AV (Blu-ray Disc Audio/Visual): a consumer-oriented Blu-ray video format used for audio/video recording (defined in 2002). * BDMV or BD-MV (Blu-ray Disc Movie): a Blu-ray video format with menu capability commonly used for movie releases. * BDMV Recording specification (defined in September 2006 for BD-RE and BD-R). * RREF (Realtime Recording and Editing Format): a subset of BDMV designed for real-time recording and editing applications. * HFPA (High Fidelity Pure Audio): A high definition audio disc using the Blu-ray format
Directory and file structureAll BDMV application files are stored under a "BDMV" directory. * BDMV directory: contains the PLAYLIST, CLIPINF, STREAM, AUXDATA and BACKUP directories. ** PLAYLIST directory: contains the Database files for Movie PlayLists. *** xxxxx.mpls files: store information corresponding to Movie PlayLists. One file is created for each Movie PlayList. The filenames of these files are in the form "xxxxx.mpls", where "xxxxx" is a 5-digit number corresponding to the Movie PlayList. ** CLIPINF directory: contains the Database files for Clips. *** zzzzz.clpi files: store Clip information associated with a Clip AV stream file. The filenames of these files are in the form "zzzzz.clpi", where "zzzzz" is a 5-digit number corresponding to the Clip. ** STREAM directory: contains AV stream files. *** zzzzz.m2ts file: contains a BDAV MPEG-2 transport stream. The names of these files are in the form "zzzzz.m2ts", where "zzzzz" is a 5-digit number corresponding to the Clip. The same 5-digit number "zzzzz" is used for an AV stream file and its associated Clip information file. *** SSIF directory: If used, Stereoscopic Interleaved files shall be placed under this directory. **** zzzzz.ssif file: is a Stereoscopic Interleaved file that is composed from two BDAV MPEG-2 transport streams. Both of the streams include an MPEG-4 MVC view video stream for left eye or right eye respectively. This file is used only when 3D video is played back. The 5-digit number "zzzzz" is the same as the number used for the AV stream file "zzzzz.m2ts" that includes the MPEG-4 MVC Base view video stream. ** AUXDATA directory: contains Sound data files and Font files. *** sound.bdmv file: stores data relating to one or more sounds associated with HDMV Interactive Graphic streams applications. This file may or may not exist under the AUXDATA directory. If it exists, there shall be only one sound.bdmv file. *** aaaaa.otf file: stores the font information associated with Text subtitle applications. The names of these files are in the form "aaaaa.otf", where "aaaaa" is a 5-digit number corresponding to the Font. ** BACKUP directory: contains copies of the "index.bdmv" file, the "MovieObject.bdmv" file, all the files in the PLAYLIST directory and all files in the CLIPINF directory. ** index.bdmv file: stores information describing the contents of the BDMV directory. There is only one index.bdmv file under the BDMV directory. ** MovieObject.bdmv file: stores information for one or more Movie Objects. There is only one MovieObject.bdmv under the BDMV directory.
Container formatAudio, video, and other streams are Multiplexing, multiplexed and stored on Blu-ray Discs in a Digital container format, container format based on the MPEG transport stream. It is also known as BD-AV, BDAV MPEG-2 transport stream and can use filename extension .m2ts.Videohelp.co
CodecsThe BD-ROM specification mandates certain codec compatibilities for both hardware decoders (players) and movie software (content). Windows Media Player does not come with the codecs required to play Blu-ray Discs.
=Video= Originally, BD-ROMs stored video up to 1920×1080 pixel resolution at up to 60 (59.94) Field (video), fields per second. Currently, with UHD BD-ROM, videos can be stored at a maximum of 3840×2160 pixel resolution at up to 60 (59.94) frames per second, progressively scanned. While most current Blu-ray players and recorders can read and write 1920×1080 video at the full 59.94p and 50p progressive format, new players for the UHD specifications will be able to read at 3840×2160 video at either 59.94p and 50p formats. a Only supported on UltraHD Blu-ray with High Efficiency Video Coding, HEVC video compression standard.
=Audio= For audio, BD-ROM players are required to implement Dolby Digital (AC-3), DTS (sound system), DTS, and Linear pulse-code modulation, linear PCM. Players may optionally implement Dolby Digital Plus and DTS (sound system), DTS-HD High Resolution Audio as well as Lossless audio, lossless formats Dolby TrueHD and DTS-HD Master Audio. BD-ROM titles must use one of the mandatory schemes for the primary soundtrack. A secondary audiotrack, if present, may use any of the mandatory or optional codecs.
Bit rateFor users recording digital television programming, the recordable Blu-ray Disc standard's initial data rate of 36 Mbit/s is more than adequate to record high-definition broadcasts from any source (IPTV, cable/satellite, or terrestrial). BD Video movies have a maximum data transfer rate of 54 Mbit/s, a maximum AV bitrate of 48 Mbit/s (for both audio and video data), and a maximum video bit rate of 40 Mbit/s. This compares to HD DVD movies, which have a maximum data transfer rate of 36 Mbit/s, a maximum AV bitrate of 30.24 Mbit/s, and a maximum video bitrate of 29.4 Mbit/s.
Java software interfaceAt the 2005 JavaOne trade show, it was announced that Sun Microsystems' Java edition, Java cross-platform software environment would be included in all Blu-ray Disc players as a mandatory part of the standard. Java is used to implement interactive menus on Blu-ray Discs, as opposed to the method used on -video discs. DVDs use pre-rendered MPEG segments and selectable subtitle pictures, which are considerably more primitive and rarely seamless. At the conference, Java creator James Gosling suggested that the inclusion of a Java virtual machine, as well as network connectivity in some BD devices, will allow updates to Blu-ray Discs via the Internet, adding content such as additional subtitle languages and promotional features not included on the disc at pressing time. This Java Version is called BD-J and is built on a profile of the Globally Executable MHP (GEM) standard; GEM is the worldwide version of the Multimedia Home Platform standard.
Player profilesThe BD-ROM specification defines four Blu-ray Disc player profiles, including an audio-only player profile (BD-Audio) that does not require video decoding or BD-J. All of the video-based player profiles (BD-Video) are required to have a full implementation of BD-J. a This is used for storing audio/video and title updates. It can either be built-in memory or removable media, such as a memory card or USB flash memory.
BD-LiveThe biggest difference between Bonus View and BD-Live is that BD-Live requires the Blu-ray Disc player to have an Internet connection to access Internet-based content. BD-Live features have included Internet chats, scheduled chats with the director, Internet games, downloadable featurettes, downloadable quizzes, and downloadable movie trailers. While some Bonus View players may have an Ethernet port, it is used for firmware updates and is not used for Internet-based content. In addition, Profile 2.0 also requires more local storage in order to handle this content. Profile 1.0 players are not eligible for Bonus View or BD-Live compliant upgrades and do not have the function or capability to access these upgrades, with the exception of the latest players and the . Internet is required to use.
Region codesAs with the implementation of DVD region code, region codes for DVDs, Blu-ray Disc players sold in a specific geographical region are designed to play only discs authorized by the content provider for that region. This is intended to permit content providers (motion picture studios, television production company etc.) to enact regional price discrimination and/or exclusive license, exclusive content licensing. According to the Blu-ray Disc Association, all Blu-ray Disc players and Blu-ray Disc-equipped computer systems are required to enforce regional coding. However, content providers need not use region playback codes. Some current estimates suggest 70% of available movie Blu-ray Discs from the major studios are region-free and can therefore be played on any Blu-ray Disc player in any region. Movie distributors have different region coding policies. Among major U.S. studios, Walt Disney Pictures, , , Universal Studios, and Sony Pictures Entertainment, Sony Pictures have released most of their titles free of region coding. and Lions Gate Entertainment have released a mix of region-free and region-coded titles. released most of their titles region-coded pre-Disney merger.Most of their post-Disney merger content is region-free, however. Vintage film restoration and distribution company The Criterion Collection uses US region coding in all Blu-ray releases, with their releases in the UK market using UK region coding. The Blu-ray Disc region coding scheme divides the world into three regions, labeled A, B, and C. A new form of Blu-ray region coding tests not only the region of the player/player software, but also its country code, repurposing a user setting intended for Internationalization and localization, localization (PSR19) as a new form of regional lockout. This means, for example, while both the US and Japan are Region A, some American discs will not play on devices/software configured for Japan or vice versa, since the two countries have different country codes. (For example, the United States is "US" (21843 or Hexadecimal, hex 0x5553), Japan is "JP" (19024 or hex 0x4a50), and Canada is "CA" (17217 or hex 0x4341).) Although there are only three Blu-ray regions, the country code allows much more precise control of the regional distribution of Blu-ray Discs than the six (or eight) DVD regions. With Blu-ray Discs, there are no "special regions" such as the regions 7 and 8 for DVDs. In circumvention of region coding restrictions, stand-alone Blu-ray Disc players are sometimes modified by third parties to allow for playback of Blu-ray Discs (and DVDs) with ''any'' region code. Instructions ("hacks") describing how to reset the Blu-ray region counter of computer player applications to make them multi-region indefinitely are also regularly posted to video enthusiast websites and forums. Unlike DVD region codes, Blu-ray region codes are verified only by the player software, not by the Regional Playback Control, optical drive's firmware. The latest types of Blu-ray players, suitable for UltraHD content, are not region-free; however; the UHD discs for which they are designed have not been coded to be locked to any region, and will work worldwide.
Digital rights managementThe Blu-ray Disc format employs several layers of (DRM) which restrict the usage of the discs. This has led to extensive criticism of the format by organizations Digital rights management, opposed to DRM, such as the Free Software Foundation, and consumers because new releases require player firmware updates to allow disc playback.
High-bandwidth Digital Content ProtectionBlu-ray equipment is required to implement the High-bandwidth Digital Content Protection (HDCP) system to encrypt the data sent by players to rendering devices through physical connections. This is aimed at preventing the copying of copyrighted content as it travels across cables. Through a Flag (computing), protocol flag in the media stream called the Image Constraint Token (ICT), a Blu-ray Disc can enforce its reproduction in a lower resolution whenever a full HDCP-compliant link is not used. In order to ease the transition to high definition formats, the adoption of this protection method was postponed until 2011.
Advanced Access Content SystemThe Advanced Access Content System (AACS) is a standard for Digital distribution, content distribution and . It was developed by AACS LA, AS Licensing Administrator, LLC (AACS LA), a consortium that includes The Walt Disney Company, Disney, Intel, , , , IBM, , and Sony. Since the appearance of the format on devices in 2006, AACS encryption key controversy#TIMELINE, several successful attacks have been made on it. The first known attack relied on the trusted client problem. In addition, decryption keys have been extracted from a weakly protected player (WinDVD). Since keys can be revoked in newer releases, this is only a temporary attack, and new keys must continually be discovered in order to decrypt the latest discs.
BD+BD+ was developed by Cryptography Research, Cryptography Research Inc. and is based on their concept of Self-Protecting Digital Content. BD+, effectively a small virtual machine embedded in authorized players, allows content providers to include executable programs on Blu-ray Discs. Such programs can: * Examine the host environment to see if the player has been tampered with. Every licensed playback device manufacturer must provide the BD+ licensing authority with memory footprints that identify their devices. * Verify that the player's keys have not been changed * Execute native code, possibly to patch an otherwise insecure system * Transform the audio and video output. Parts of the content will not be viewable without letting the BD+ program unscramble it. If a playback device manufacturer finds that its devices have been hacked, it can potentially release BD+ code that detects and circumvents the vulnerability. These programs can then be included in all new content releases. The specifications of the BD+ virtual machine are available only to licensed device manufacturers. A list of licensed commercial adopters is available from th
BD-ROM MarkROM Mark is a small amount of cryptographic data that is stored separately from normal Blu-ray Disc data, aiming to prevent replication of the discs. The cryptographic data is needed to decrypt the copyrighted disc content protected by AACS. A specially licensed piece of hardware is required to insert the ROM Mark into the media during mastering. During replication, this ROM Mark is transferred together with the recorded data to the disc. In consequence, any copies of a disc made with a regular recorder will lack the ROM Mark data and will be unreadable on standard players.
Backward compatibilityThe Blu-ray Disc Association recommends but does not require that Blu-ray Disc drives be capable of reading standard DVDs and CDs, for backward compatibility. Most Blu-ray Disc players are capable of reading both CDs and DVDs; however, a few of the early Blu-ray Disc players released in 2006, such as the Sony BDP-S1, could play DVDs but not CDs. In addition, with the exception of some early models from LG and Samsung, Blu-ray players cannot play s, and HD DVD players cannot play Blu-ray Discs. Some Blu-ray players can also play Video CDs, Super Audio CDs, and/or DVD-Audio discs, and all players can play regular Blu-ray Discs, and most can play DVDs and CDs. The PlayStation 4 and Playstation 5 do not support CDs.
High Fidelity Pure Audio (BD-A)High Fidelity Pure Audio (HFPA) is a marketing initiative, spearheaded by the Universal Music Group, for audio-only Blu-ray optical discs. Launched in 2013 as a potential successor to the compact disc, it has been compared with DVD-A and Super Audio CD, SACD, which had similar aims.
AVCHDAVCHD was originally developed as a high-definition format for consumer tapeless camcorders. Derived from the Blu-ray Disc specification, AVCHD shares a similar random access directory structure but is restricted to lower audio and video bitrates, simpler interactivity, and the use of AVC-video and Dolby AC-3 (or linear PCM) audio. Being primarily an acquisition format, AVCHD playback is not universally recognized among devices that play Blu-ray Discs. Nevertheless, many such devices are capable of playing AVCHD recordings from removable media, such as DVDs, Secure Digital, SD/Secure Digital, SDHC memory cards, "Memory Stick" cards, and hard disk drives.
AVCRECAVCREC uses a BDAV container to record high-definition content on conventional DVDs. Presently AVCREC is tightly integrated with the Japanese ISDB broadcast standard and is not marketed outside of Japan. AVCREC is used primarily in set-top digital video recorders and in this regard it is comparable to HD DVD#HD REC, HD REC.
Blu-ray 3DThe Blu-ray Disc Association (BDA) created a task force made up of executives from the film industry and the consumer electronics and IT sectors to help define standards for putting 3D film and 3D television content on a Blu-ray Disc. On December 17, 2009, the BDA officially announced 3D specs for Blu-ray Disc, allowing backward compatibility with current 2D Blu-ray players, though compatibility is limited by the fact that the longer 3D discs are triple-layer, which normal (2D only) players cannot read. The BDA has said, "The Blu-ray 3D specification calls for encoding 3D video using the "Stereo High" profile defined by Multiview Video Coding (MVC), an extension to the ITU-T H.264 Advanced Video Coding (AVC) codec currently implemented by all Blu-ray Disc players. MPEG4-MVC compresses both left and right eye views with a typical 50% overhead compared to equivalent 2D content, and can provide full 1080p resolution backward compatibility with current 2D Blu-ray Disc players." This means the MVC (3D) stream is backward compatible with H.264/AVC (2D) stream, allowing older 2D devices and software to decode stereoscopic video streams, ignoring additional information for the second view. However, some 3D discs have a user limitation set preventing the disc from being viewed in 2D (though a 2D disc is often included in the packaging). Sony added Blu-ray 3D support to its console via a PlayStation 3 system software, firmware upgrade on 21 September 2010. The console had previously gained 3D gaming capability via an update on 21 April 2010. Since the version 3.70 software update on August 9, 2011, the PlayStation 3 can play DTS-HD Master Audio and DTS-HD High Resolution Audio while playing 3D Blu-ray. Dolby TrueHD is used on a small minority of Blu-ray 3D releases, and Bitstream format, bitstreaming implemented in slim PlayStation 3 models only (original "fat" PS3 models decode internally and send audio as LPCM). The PlayStation VR can also be used to watch these movies in 3D on a . As of 2018, most major home entertainment studios, such as Walt Disney Studios Home Entertainment, Walt Disney Studios, Sony Pictures, , and Universal Pictures had discontinued the Blu-ray 3D format in North America, but continued to produce and sell them in other regions such as South America, Europe, Asia, and Australia. has ceased sales and productions of 3D Blu-ray discs all over the world, its last 3D releases being ''Ghost in the Shell (2017 film), Ghost in the Shell'' and ''Transformers: The Last Knight'', while still continues to sell and produce 3D Blu-ray discs to this day in all regions, notable titles including: ''Wonder Woman (2017 film), Wonder Woman'', ''Blade Runner 2049'', ''Justice League (2017 film), Justice League'', ''Tomb Raider (film), Tomb Raider'', ''Rampage (2018 film), Rampage'', ''Aquaman (film), Aquaman'', ''The Lego Movie 2: The Second Part'', ''Shazam! (film), Shazam!'', and ''Godzilla: King of the Monsters (2019 film), Godzilla: King of the Monsters''.
See also* 2D plus Delta * Optical disc authoring#Blu-ray Disc, Blu-ray Disc authoring * Blu-ray Disc recordable * D-VHS * Comparison of high definition optical disc formats, Comparison of high-definition optical disc formats * Comparison of video player software#Optical media ability, Comparison of video player software: Optical media ability, for a list of software BD video players * Digital 3D and 3D television * Disk-drive performance characteristics * Format war * * High-definition optical disc format war * High-definition television * List of Blu-ray disc manufacturers * List of Blu-ray player manufacturers * * W-VHS