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Wikipedia

Xvid

Xvid (formerly "XviD") is a video codec library following the MPEG-4 video coding standard, specifically MPEG-4 Part 2 Advanced Simple Profile (ASP). It uses ASP features such as b-frames, global and quarter pixel motion compensation, lumi masking, trellis quantization, and H.263, MPEG and custom quantization matrices.

Xvid
Initial release2001; 20 years ago (2001) (as XviD)
Stable release1.3.7 (December 28, 2019; 22 months ago (2019-12-28))[±]
Preview releaseSVN[±]
Repositorywebsvn.xvid.org
Written inC
Operating systemCross-platform
Size11 MB
Standard(s)MPEG-4 ASP
TypeVideo codec
LicenseGNU General Public License
Websitewww.xvid.com

Xvid is a primary competitor of the DivX Pro Codec. In contrast with the DivX codec, which is proprietary software developed by DivX, Inc., Xvid is free software distributed under the terms of the GNU General Public License. This also means that unlike the DivX codec, which is only available for a limited number of platforms, Xvid can be used on all platforms and operating systems for which the source code can be compiled.

Contents

In January 2001, DivXNetworks founded OpenDivX as part of Project Mayo which was intended to be a home for open source multimedia projects. OpenDivX was an open-source MPEG-4 video codec based on a stripped-down version of the MoMuSys reference MPEG-4 encoder. The source code, however, was placed under a restrictive license and only members of the DivX Advanced Research Centre (DARC) had write access to the project's CVS. In early 2001, DARC member Sparky wrote an improved version of the encoding core called encore2. This was updated several times before, in April, it was removed from CVS without warning. The explanation given by Sparky was "We (our bosses) decided that we are not ready to have it in public yet."

In July 2001, developers started complaining about a lack of activity in the project; the last CVS commit was several months old, bugfixes were being ignored, and promised documentation had not been written. Soon after, DARC released a beta version of their closed-source commercial DivX 4 codec, which was based on encore2, saying that "what the community really wants is a Winamp, not a Linux." It was after this that a fork of OpenDivX was created, using the latest version of encore2 that was downloaded before it was removed. Since then, all the OpenDivX code has been replaced and Xvid has been published under the GNU General Public License.

As an implementation of MPEG-4 Part 2, Xvid uses many patented technologies. For this reason, Xvid 0.9.x versions were not licensed in countries where these software patents are recognized. With the 1.0.x releases, a GNU GPL v2 license is used with no explicit geographical restriction. However, the legal usage of Xvid may still be restricted by local laws.[citation needed]

In July 2002, Sigma Designs released an MPEG-4 video codec called the REALmagic MPEG-4 Video Codec. Before long, people testing this new codec found that it contained considerable portions of Xvid code. Sigma Designs was contacted and confirmed that a programmer had based REALmagic on Xvid, but assured that all GPL code would be replaced to avoid copyright infringement. When Sigma Designs released the supposedly rewritten REALmagic codec, the Xvid developers immediately disassembled it and concluded that it still contained Xvid code, only rearranged in an attempt to disguise its presence. The Xvid developers decided to stop work and go public to force Sigma Designs to respect the terms of the GPL. After articles were published in Slashdot and The Inquirer, in August 2002 Sigma Designs agreed to publish their source code.

Encoder and decoder configuration dialog

Xvid is not a video format; it is a program for compressing to and decompressing from (hence the name codec) the MPEG-4 ASP format. Since Xvid uses MPEG-4 Advanced Simple Profile (ASP) compression, video encoded with Xvid is MPEG-4 ASP video (not "Xvid video"), and can therefore be decoded with all ASP-compliant decoders. This includes a large number of media players and decoders based on libavcodec (such as MPlayer, VLC, ffdshow or Perian). As of 2016[update], xvid.com carries binaries for using the codec.

Xvid encoded files can be written to a CD or DVD and played in some (but not all) DivX compatible DVD players and media players. However, Xvid can optionally encode video with advanced MPEG-4 features that most DivX Certified set-top players do not support. Files encoded with global motion compensation, Qpel, MPEG quantization, multiple B-frames or files that exceed the Video buffering verifier limitations may not play back properly on DivX Certified hardware devices.

For example, Xvid specifies three warp points for its implementation of global motion compensation as opposed to the single warp point implementation of DivX. Enabling some of the more advanced encoding features can compromise player compatibility. Some issues exist with the custom quantization matrices used in tools such as AutoGK that automate encoding with Xvid. This can (depending on the decoder chipset of the set-top player in question) produce videos that have unstable playback and artifacts. However, most recent model DivX compatible DVD players have improved support for custom quantization matrices.

Operating systems Software Comment
Windows VirtualDub, DVDx, xvid encraw, AutoGK, MeGUI etc. And all other applications that support encoding through the VfW framework.
Mac OS X, Linux, BSD, and Windows MEncoder, Avidemux, VLC, WinFF (graphical front-end based on FFmpeg), etc. These platform and framework independent applications access the Xvid library directly.
  1. "Questions and Answers". RetrievedNovember 4, 2016. Xvid is Free Software and published under the GNU GPL license.
  2. "DivX Software". DivX. RetrievedNovember 4, 2016.
  3. Sibaud, Benedict, ed. (June 11, 2004). "Interview de l'équipe XviD et sortie de la version 1.0.1" [Interview of the XviD team and release of version 1.0.1]. linuxfr.org (in French). Archived from the original on November 5, 2016. RetrievedNovember 5, 2016. In March 2001, a rewritten encoder library was committed to the CVS (by a DivXNetworks staff). The rewritten library was removed shortly after, with DivXNetworks citing that "We (our bosses) decided that we are not ready to have it in public yet."
  4. Lai, Hongli (August 17, 2001). "[vorbis] Vorbis ACM codec". Archived from the original on April 28, 2016. RetrievedNovember 4, 2016.
  5. "MPEG-4 Visual Patent Portfolio License"(PDF). July 1, 2008. Archived from the original(PDF) on November 20, 2008. RetrievedNovember 5, 2016.
  6. michael (August 22, 2002). "Sigma Designs Accused of Copyright Infringement". Slashdot. Archived from the original on June 10, 2016.
  7. Magee, Mike (August 22, 2002). "XVID asks Sigma to stop copyright breach". The Inquirer. Archived from the original on March 5, 2016. RetrievedNovember 5, 2016.CS1 maint: unfit URL (link)
  8. Lowe, Ken; Porter, Stephanie (August 22, 2002). "SIGMA MAKES SOURCE CODE AVAILABLE FOR ITS MPEG-4 VIDEO CODEC"(PDF). Sigma Designs. California, United States. Archived from the original(PDF) on March 14, 2006. RetrievedNovember 5, 2016.
  9. "Download". Xvid. RetrievedNovember 3, 2016.
  10. Barranco, Iñigo Lopez (November 25, 2004). "[vlc] Can VLC play MPEG2-ES a live.com RTP streaming?". Archived from the original on March 5, 2016. RetrievedNovember 5, 2016.

Xvid
Xvid Article Talk Language Watch Edit Xvid formerly XviD is a video codec library following the MPEG 4 video coding standard specifically MPEG 4 Part 2 Advanced Simple Profile ASP It uses ASP features such as b frames global and quarter pixel motion compensation lumi masking trellis quantization and H 263 MPEG and custom quantization matrices XvidInitial release2001 20 years ago 2001 as XviD Stable release1 3 7 December 28 2019 22 months ago 2019 12 28 Preview releaseSVN Repositorywebsvn wbr xvid wbr orgWritten inCOperating systemCross platformSize11 MBStandard s MPEG 4 ASPTypeVideo codecLicenseGNU General Public LicenseWebsitewww wbr xvid wbr com Xvid is a primary competitor of the DivX Pro Codec In contrast with the DivX codec which is proprietary software developed by DivX Inc Xvid is free software distributed under the terms of the GNU General Public License 1 This also means that unlike the DivX codec which is only available for a limited number of platforms 2 Xvid can be used on all platforms and operating systems for which the source code can be compiled Contents 1 History 2 Patent issues 3 Sigma Designs controversy 4 Playing Xvid encoded files 5 Encoding applications 6 See also 7 References 8 External linksHistory EditIn January 2001 DivXNetworks founded OpenDivX as part of Project Mayo which was intended to be a home for open source multimedia projects OpenDivX was an open source MPEG 4 video codec based on a stripped down version of the MoMuSys reference MPEG 4 encoder The source code however was placed under a restrictive license and only members of the DivX Advanced Research Centre DARC had write access to the project s CVS In early 2001 DARC member Sparky wrote an improved version of the encoding core called encore2 This was updated several times before in April it was removed from CVS without warning The explanation given by Sparky was We our bosses decided that we are not ready to have it in public yet 3 In July 2001 developers started complaining about a lack of activity in the project the last CVS commit was several months old bugfixes were being ignored and promised documentation had not been written Soon after DARC released a beta version of their closed source commercial DivX 4 codec which was based on encore2 saying that what the community really wants is a Winamp not a Linux 4 It was after this that a fork of OpenDivX was created using the latest version of encore2 that was downloaded before it was removed Since then all the OpenDivX code has been replaced and Xvid has been published under the GNU General Public License Patent issues EditAs an implementation of MPEG 4 Part 2 Xvid uses many patented technologies 5 For this reason Xvid 0 9 x versions were not licensed in countries where these software patents are recognized With the 1 0 x releases a GNU GPL v2 license is used with no explicit geographical restriction However the legal usage of Xvid may still be restricted by local laws citation needed Sigma Designs controversy EditIn July 2002 Sigma Designs released an MPEG 4 video codec called the REALmagic MPEG 4 Video Codec Before long people testing this new codec found that it contained considerable portions of Xvid code Sigma Designs was contacted and confirmed that a programmer had based REALmagic on Xvid but assured that all GPL code would be replaced to avoid copyright infringement When Sigma Designs released the supposedly rewritten REALmagic codec the Xvid developers immediately disassembled it and concluded that it still contained Xvid code only rearranged in an attempt to disguise its presence The Xvid developers decided to stop work and go public to force Sigma Designs to respect the terms of the GPL After articles were published in Slashdot 6 and The Inquirer 7 in August 2002 Sigma Designs agreed to publish their source code 8 Playing Xvid encoded files Edit Encoder and decoder configuration dialog Xvid is not a video format it is a program for compressing to and decompressing from hence the name codec the MPEG 4 ASP format Since Xvid uses MPEG 4 Advanced Simple Profile ASP compression video encoded with Xvid is MPEG 4 ASP video not Xvid video and can therefore be decoded with all ASP compliant decoders This includes a large number of media players and decoders based on libavcodec such as MPlayer VLC ffdshow or Perian As of 2016 update xvid com carries binaries for using the codec 9 Xvid encoded files can be written to a CD or DVD and played in some but not all DivX compatible DVD players and media players However Xvid can optionally encode video with advanced MPEG 4 features that most DivX Certified set top players do not support Files encoded with global motion compensation Qpel MPEG quantization multiple B frames or files that exceed the Video buffering verifier limitations may not play back properly on DivX Certified hardware devices For example Xvid specifies three warp points for its implementation of global motion compensation as opposed to the single warp point implementation of DivX Enabling some of the more advanced encoding features can compromise player compatibility Some issues exist with the custom quantization matrices used in tools such as AutoGK that automate encoding with Xvid This can depending on the decoder chipset of the set top player in question produce videos that have unstable playback and artifacts However most recent model DivX compatible DVD players have improved support for custom quantization matrices See also Video format abilityEncoding applications EditOperating systems Software CommentWindows VirtualDub DVDx xvid encraw AutoGK MeGUI etc And all other applications that support encoding through the VfW framework Mac OS X Linux BSD and Windows MEncoder Avidemux VLC 10 WinFF graphical front end based on FFmpeg etc These platform and framework independent applications access the Xvid library directly See also Edit Free and open source software portal List of codecs Comparison of video codecsReferences Edit Questions and Answers Retrieved November 4 2016 Xvid is Free Software and published under the GNU GPL license DivX Software DivX Retrieved November 4 2016 Sibaud Benedict ed June 11 2004 Interview de l equipe XviD et sortie de la version 1 0 1 Interview of the XviD team and release of version 1 0 1 linuxfr org in French Archived from the original on November 5 2016 Retrieved November 5 2016 In March 2001 a rewritten encoder library was committed to the CVS by a DivXNetworks staff The rewritten library was removed shortly after with DivXNetworks citing that We our bosses decided that we are not ready to have it in public yet Lai Hongli August 17 2001 vorbis Vorbis ACM codec Archived from the original on April 28 2016 Retrieved November 4 2016 MPEG 4 Visual Patent Portfolio License PDF July 1 2008 Archived from the original PDF on November 20 2008 Retrieved November 5 2016 michael August 22 2002 Sigma Designs Accused of Copyright Infringement Slashdot Archived from the original on June 10 2016 Magee Mike August 22 2002 XVID asks Sigma to stop copyright breach The Inquirer Archived from the original on March 5 2016 Retrieved November 5 2016 CS1 maint unfit URL link Lowe Ken Porter Stephanie August 22 2002 SIGMA MAKES SOURCE CODE AVAILABLE FOR ITS MPEG 4 VIDEO CODEC PDF Sigma Designs California United States Archived from the original PDF on March 14 2006 Retrieved November 5 2016 Download Xvid Retrieved November 3 2016 Barranco Inigo Lopez November 25 2004 vlc Can VLC play MPEG2 ES a live com RTP streaming Archived from the original on March 5 2016 Retrieved November 5 2016 External links EditXvid org website Xvid Setup Reference Guide Digital Digest Xvid Binary Download Page Links to Windows Linux binaries on the official website Xvid Source Code Download Page includes daily snapshots on the official website Xvid QuickTime Component unofficial Xvid component for Mac OS X Retrieved from https en wikipedia org w index php title Xvid amp oldid 1038809494, wikipedia, 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