Xvid

Xvid
Initial release 2001 (2001) (as XviD)
Stable release 1.3.4 (June 21, 2015 (2015-06-21)) [±]
Preview release SVN [±]
Repository websvn.xvid.org
Development status Active
Written in C
Operating system Cross-platform
Size 11 MB
Standard(s) MPEG-4 ASP
Type Video codec
License GNU General Public License
Alexa rank 178,449 Increase (November 2016)
Website www.xvid.com

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 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.

History

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."[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

As 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.

Sigma Designs controversy

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[6] and The Inquirer,[7] in August 2002 Sigma Designs agreed to publish their source code.[8]

Playing Xvid encoded files

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, 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.

Encoding applications

Operating systems Software Comment
Windows VirtualDub, DVDx, xvid encraw, AutoGK etc. And all other applications that support encoding through the VfW framework.
Mac OS X, Linux, BSD, and Windows MEncoder, Transcode, Avidemux, VLC,[10] etc. These platform and framework independent applications access the Xvid library directly.

See also

References

  1. ↑ "Questions and Answers". Retrieved November 4, 2016. Xvid is Free Software and published under the GNU GPL license.
  2. ↑ "DivX Software". DivX. Retrieved November 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. 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."
  4. ↑ Lai, Hongli (August 17, 2001). "[vorbis] Vorbis ACM codec". Archived from the original on April 28, 2016. Retrieved November 4, 2016.
  5. ↑ "MPEG-4 Visual Patent Portfolio License" (PDF). July 1, 2008. Archived from the original (PDF) on November 20, 2008. Retrieved November 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. Retrieved November 5, 2016.
  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. Retrieved November 5, 2016.
  9. ↑ "Download". Xvid. Retrieved November 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. Retrieved November 5, 2016.
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