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Xvid

 
Xvid
Stable release 1.3.2 / May 31, 2011; 19 months ago
Operating System Cross-platform
Type Video codec
License GNU General Public License
Website www.xvid.org

As a primary competitor of the DivX Pro Codec, which is proprietary software developed by DivX, Inc., Xvid is free software under the terms of the GNU General Public License. Formerly known as "XviD", Xvid is a video codec library following the MPEG-4 standard, specifically MPEG-4 Part 2 Advanced Simple Profile (Abbreviated as ASP). It uses ASP feature sucn as b-frames, global and quarter pixel motion compensation, lumi masking, trellis quantization and H.263, MPEG and custom quantization matrices. Unlike 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.

 

Patent Issues

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.


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 and The Inquirer, in August 2002 Sigma Designs agreed to publish their source code.


Playing Xvid encoded files

Primarily due to concerns over patents, the official Xvid web site does not provide binary versions of the Xvid codec. However, it does link to supporting web sites that provide Video for Windows codecs (and DirectShow decoding filters) for Microsoft Windows.

Xvid is not a video format – it is a program (codec) for compressing and decompressing to the MPEG-4 ASP format. Since Xvid uses MPEG-4 Advanced Simple Profile (ASP) compression, any video that is encoded with it is termed "MPEG-4 ASP video" – not "Xvid video" – and can therefore be decoded with all MPEG-4 ASP compliant decoders. This includes a large number of media players and decoders, in particular all the ones based on the free/open source libavcodec library from FFmpeg (for example, MPlayer, VLC, ffdshow or Perian).

Xvid encoded files can be written to a CD or DVD and played in some (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 VBV 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

 

     Windows

Mac OS X, Linux, BSD, and Windows

 

Software

VirtualDub, DVDx, xvid encraw, AutoGK etc. MEncoder, Transcode, Avidemux, VLC, etc.

 

 

Comment

And all other applications that support encoding through the VfW framework. These platform and framework independent applications access the Xvid library directly.
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Requirements

You can download Blu-ray Media Player and test it before buying.

Requires OS X 10.5+ and Blu-ray Drive

Requires Windows XP or later and Blu-ray Drive

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