DivX: История и развитие видеокодека

Brand of video codec products by DivX, LLC
the video codec

DivX is a brand of video codec products developed by DivX, LLC. There are three DivX codecs: the original MPEG 4 Part 2 DivX codec, the H.264/MPEG 4 AVC DivX Plus HD codec and the High Efficiency Video Coding DivX HEVC Ultra HD codec. The most recent version of the codec itself is version 6.9.2, which is several years old. New version numbers on the packages now reflect updates to the media player, converter, etc.

The "DivX" brand is distinct from "DIVX", which is an obsolete video rental system. The winking emoticon in the early "DivX ; )" codec name was a tongue in cheek reference to the DIVX system. Although not created by them, the DivX company adopted the name of the popular DivX ; ) codec. The company dropped the smiley and released DivX 4.0, which was actually the first DivX version to trademark the term DivX. DivX ; ) (not DivX) 3.11 Alpha and later 3. xx versions refers to a hacked version of the Microsoft MPEG 4 Version 3 video codec (not to be confused with MPEG 4 Part 3) from Windows Media Tools 4 codecs. The video codec, which was actually not MPEG 4 compliant, was extracted around 1998 by French hacker Jerome Rota (also known as Gej) at Montpellier. The Microsoft codec originally required that the compressed output be put in an ASF file. It was altered to allow other containers such as Audio Video Interleave (AVI). Rota hacked the Microsoft codec because newer versions of the Windows Media Player would not play his video portfolio and résumé that were encoded with it. Instead of re encoding his portfolio, Rota and German hacker Max Morice decided to reverse engineer the codec, which "took about a week". In early 2000, Jordan Greenhall recruited Rota to form a company (originally called DivXNetworks, Inc., renamed to DivX, Inc. in 2005) to develop an MPEG 4 codec, from scratch, that would still be backward compatible with the Microsoft MPEG 4 Version 3 format. This effort resulted first in the release of the "OpenDivX" codec and source code on 15 January 2001. OpenDivX was hosted as an open source project on the Project Mayo web site hosted at projectmayo. com (the name comes from "mayonnaise", because, according to Rota, DivX and mayonnaise are both "French and very hard to make." where he and Greenhall founded what would eventually become DivX, Inc. In 2014, Blackstone Group and Parallax Capital acquired DivX from Rovi for $75 million. On January 5, 2015, it was announced that IPTV company NeuLion would acquire DivX for $62.5 million. In February 2018, a deal was finalized to sell certain DivX assets, intellectual property and subsidiaries from NeuLion, Inc. to Fortress Investment Group. DivX, LLC continues to operate from their headquarters in San Diego and release new versions of DivX Software for Windows and macOS.

DivX 6 expanded the scope of DivX from including just a codec and a player by adding an optional media container format called "DivX Media Format" ("DMF") (with a divx extension) that includes support for the following DVD Video and VOB container like features. This media container format is used for the MPEG 4 Part 2 codec. This new DivX Media Format also came with a "DivX Ultra Certified" profile, and all "Ultra" certified players must support all DivX Media Format features. While video encoded with the DivX codec is an MPEG 4 video stream, the DivX Media Format is analogous to media container formats such as Apple's QuickTime. In much the same way that media formats such as DVD specify MPEG 2 video as a part of their specification, the DivX Media Format specifies MPEG 4 compatible video as a part of its specification. However, despite the use of the ". divx" extension, this format is an extension to the AVI file format. The methods of including multiple audio and even subtitle tracks involve storing the data in RIFF headers and other such AVI hacks which have been known for quite a while, such that even VirtualDubMod supports them. DivX, Inc. did this on purpose to keep at least partial backward compatibility with AVI, so that players that do not support the new features available to the divx container format (like interactive menus, chapter points and XSUB subtitles) can at least play that primary video stream (usually the main movie if the DMF file contains multiple video streams like special features like bonus materials). Of course, the DivX codec and tools like Dr. DivX still support the traditional method of creating standard AVI files. Since version 5.0 of DivX, the FourCC (identifying code) for the DivX MPEG 4 Part 2 codec is DX50. Previously it used DIVX.

DivX Plus HD is a marketing name for a file type using the standard Matroska media container format (. mkv), rather than the proprietary DivX Media Format. DivX Plus HD files contain an H.264 video bitstream, AAC surround sound audio, and a number of XML based attachments defining chapters, subtitles and meta data. This media container format is used for the H.264/MPEG 4 AVC codec.

DivX Video on Demand (DivX VOD) is DivX's version of digital rights management (DRM), which allows content copyright holders to control distribution. In 2009, DivX, Inc. received format approval from major Hollywood studios including Sony, Paramount, and Lionsgate, which has allowed content retailers to sell protected videos that will play on current and previous generations of DivX certified devices. The terms of the contract are not known, so it is unknown if that approval is still in effect.

Dr. DivX OSS is capable of transcoding many video formats to DivX encoded video. The original closed source Dr. DivX terminated at version 1.06 for DivX 5.21. That was the last version of DivX capable of running on Windows 9x. An open source version has since been made, which supports DivX 6. Dr. DivX offers greatly expanded features over the free DivX Converter application, that was bundled with the codec from version 6 onwards. Dr. DivX is not compatible with DivX Plus HD. DivX has released a command line interface (CLI) for the divx264 encoder used in the DivX Converter as beta, free for non commercial use. To complement the CLI divx264 encoder released on DivX Labs, DivX has also released a DivX AAC encoder CLI as a Windows beta binary.

On 4 December 2007, native MPEG 4 ASP playback support was added to the Xbox 360, allowing it to play video encoded with DivX and other MPEG 4 ASP codecs. On 17 December 2007, firmware upgrade 2.10 was released for the Sony PlayStation 3, which included official DivX Certification. Firmware version 2.50 (released on 15 October 2008) included support for the DivX Video on Demand (DivX VOD) service, and firmware version 2.60 (released on 20 January 2009) included official DivX Certification and updated Profile support to version 3.11. With introduction of DivX to Go in the DivX Player for Windows, a PlayStation 3 icon is readily available on the interface, which will invoke a transfer wizard for freely converting and copying video files via USB or optical disc. The output from DivX to Go's PlayStation 3 preset is also playable on the Xbox 360.