Author: Shen Sheng
In 2002, in the rules of TDX2002, in addition to allowing the old Divx3.11 encoding, the second approval coding is added - i.e., the XIVD encoding in this article title. As a net high-quality audio and communication organization that releases thousands of latest movies on the Internet every year, the rules they follow have decisive important significance for the entire MPEG-4 encoded application market. XVID appears in TDX2002, appears in the posture of DivX3.11 alternative, and some people joking: XVID is a non-commercial co-edition of DivX3.11. So what is XVID? What happens to a thorough video compression? Maybe you don't know: XVID is something that does not appear ...
A few twists and turns
4 years ago, the only MPEG-4 encoder used on the PC is developed by Microsoft, including MS MPEG4V1, MS MPEG4V2, MS MPEG4V3 series encoding kernel. Among them, both of them can be used to make AVI files, which are all default components of Windows. However, the code quality of V1 and V2 is not very good until the MS MPEG4v3 starts, and the quality of the picture has a significant progress. However, Microsoft decided to enclose this MS MPEG4V3 video encoding kernel in Windows Media streaming media technology, which is the ASF file we are well known to the AVI file. Although there are some benefits, it is too close to even edit, and it is annoying the movie hacker who is not afraid. Some groups have modified Microsoft's MS MPEG4V3, unlike restrictions that cannot be used for AVI files, and open some of these compressed parameters, and then, the MPEG4 encoder DivX we are familiar with today ;-) 3 .11.
DivX is widely popular, it has become the standard of DVDRIP. The problem is that its basic technology is illegally stolen. It can only flow in the underground, but it is unable to carry out a wider range of products, and cannot produce hardware players. In this case, some masterpiece video encoded programmers (including the original DivX 3.11 developers) set a company named DivxNetworks Inc., referred to as DXN. DXN initiates an open source project ProjectMayo, the goal is to develop a new, open source MPEG4 encoding software. Especially OpenDIVX CODEC fully compliant with ISO MPEG4 standard has attracted many software masters, and quickly develops OpenDIVX encoders and decoder prototypes, and then develops higher performance encoder ENCORE 2 and so on. During this period, the main coding work is DXN people, and many technical difficulties have resolved their help from open source society.
Just when everything looks smooth, the prostitute is staged. Although ProjectMayo is an open source, it is not based on GPL (universal public license, a protocol that guarantees free use and modification common to open source projects). DXN has left one hand when designing a license agreement. In July 2001, the ENCORE 2 is basically formed. When it is almost productive, DXN has made another divx.com website, closed the source code, released their own DivX 4 . The foundation of DivX 4 is Encore 2 in OpenDivx, but uses DivX's grades, it can be said that all people have a knife. Since DXN is no longer involved, ProjectMayo is in pause, and the source code of Encore2 is also removed from the server by DXN. After a fierce debate, DXN although ad-encore 2 is legally open, it still refuses to put it back to the server. Open source society is like this.
OpenDIVX is still not actually used, while DivX 4 (and subsequent fee versions - Divx 5) have become private property. Many people have made wisdom and labor paying for Microsoft monopoly and will only help DXN make a fortune. Of course, it is not acceptable. To this end, the entire 0DAYZ organization will never reject DXN's Divx4 / 5, and the survivors in the original OpenDIVX development group gradually re-gathered development power, on the basis of the last OpenDIVX version, developed XVID. After the rest of the robbery, the XVID of the Robbery has been in the past 1 year, it inherits and develops OpenDIVX ENCORE 2, which has greatly improved performance, and is considered to be the fastest in the world's fastest MPEG4 CODEC. XVID rewrites all code and draws the foregoing of the front car in accordance with GPL release (note no longer LGPL, so who wants to use it to make a product without open source is illegal). However, because MPEG4 still has patented issues, XVID can only follow the LAME practice, just as a research exchange on how to implement ISO MPEG-4 standards, only source code on the website, if you want to use yourself, you have to compile the source code yourself. Or download compiled good-service versions to third parties.
When several guys who got Gaj flow in OpenDIVX, I was very similar to an open source project like a model model. Many people were attracted to develop, test. Until later, the guys showed the original face of the liar overnight, took the OpenDIVX's results, turned into the Divx4 of the closed source code, and then further became the Divx5 for the current charge. The original OpenDIVX was forced to abort, but it also contributed to the birth, development and growth of XVID today. The current XVID can more specifically surpass DivX 5, challenge the new generation of MPEG4 application battlefields with better quality and stronger features.
