DivX and Xvid can't say a story, it seems that many people don't know their relationship. Today's movies are getting better and better, shooting, the skill is getting more exciting, people are looking forward to higher, more and more piracy; the simultaneous film production company's anti-theft technology is getting more and more . But there is an old saying: "Tao high one foot, the magic is one feet", no matter how exciting your movies, the anti-theft technology is more high, there is always someone who can "stolen", but also "theft and thieves" Under the conditions of maintaining "original original", the space occupied is getting smaller and smaller, more and more flexible, simple, and more convenient to spread. And this technique is constantly updated, the quality is getting closer and closer, and the compression speed is getting faster, the compression / playback process is getting lower and lower. This is the new force of the DivX era - xvid.
Hegel said "existence reasonable"
With the advancement of the times, the development of society is more sharp in computer video technology. The industry standard of today's video has reached the DVD era. The price of the mainstream DVD drive has dropped within 400 yuan. The cheapest price of the DVD player has dropped to 700 yuan. But these are all in the near future. There is still a large group of online online groups. They are not willing to invest in the DVD drive, some or even because the machine cannot expand and cannot purchase the DVD drive. This urges the germination of another solution.
In addition, the popularity of the Internet broadband, the extension of the ADSL broadband, and the P2P software makes 650MB large files to easily achieve off-site transmission. There is also a great disorder of genuine DVD large film and is also a major obstacle to genuine DVD. Based on the existence of the above factors, there is a new video compression technology, which is DivX, "compressed movie". There are many kinds of technologies for compressed movies, but DIVX is most popular, it is widely circulated with the Internet and pirated plates.
Over time, the DivX is then launched. Soon after the launch, they will continue to introduce new, from DIVX3.11 to Divx4, the latest version is Divx5.02. The higher the version, the higher the technology, the quality of playback should be better, clearer. However, the facts tell us that with the improvement of the version, the compressed playback effect is not obvious, the time used by the compression is more and more, the compressed volume is not too big, and even the DivX5.02 compression will be jumped. Frame problem. This in the end is why? Does the video compression technology have reached the peak?
There is currently a new compression technology named XVID. In the video industry, I will see it, and it is a big selling point, which can greatly improve the compression time on the basis of maintaining DivX5.
From the name, you can see XVID and DivX, and there must be a thousand links between them, everyone must know. Let's talk about the story about XVID.
Long Long Ago ...
The story is like this.
As early as 1998, Microsoft developed the first (also unique) MPEG-4 encoder used on the PC, which includes MS MPEG4V1, MS MPEG4V2, MS MPEG4V3 series encoding kernel. The V1 and V2 are used to make the AVI file, and now it is now the default component of Windows. However, the quality of the coding of V1 and V2 is not very good, and until MS MPEG4v3 has begun to improve, and the image quality has a significant progress. But I don't know where Microsoft is working, but the MS MPEG4V3 video encoding kernel is closed in WINDOWS Media stream media technology, that is,, we often see the ASF streaming media file. Although the ASF file has some advantages, it cannot be edited due to excessive enclosures, and it is not widely used. This is angered a video hacker who is not afraid of the sky and a master placed in a drilled video encoding. Later, these groups not only cracked Microsoft's video coding, but also through their modifications, a new video coding was born. That is a widely circulated MPEG4 encoder - Divx3.11. Subsequent, the DivX was saved, and it became the industry standard. But the problem is the same, the basic technology of DivX is illegally stolen. Microsoft can only be circulated in the ground, but it can't get a countertop. The so-called "name is not right, not smooth", unable to carry out extensive development, ie products Can't produce hardware players.
"Productivity to change production relationship"
Under this, some video encoded advanced programmers (including the original Divx developers) have built a company called DivXNetworks Inc. This company initiates a fully open source project, named "ProjectMayo", the goal is to develop a new, open source MPEG4 encoding software. Since it is fully compliant with the ISO MPEG4 standard, it is completely open source (like Linux operating system), OpenDIVX CODEC attracted many software and video masters. Human, material resources, the OpenDIVX encoder and decoder prototype will be released quickly, and then developed encoder ENCORE 2 with higher performance. This DivX's brilliant period.
Although the main coding work is DXN person, many technical difficulties have been completely helpful from open source society.
The advantage of DivX is accepted by people, the capacity of high-quality DVD movies is generally 5GB, but the size after DivX encoding is only 650MB, only one-third of the original DVD capacity, the image quality is quite equivalent to DVD. It can be transmitted through the Internet, and can also report a CD disc (650MB).
DXN's ambition:
DivXNetworks has always hoped that DivX can become the industry standard selected by Hollywood giants, and can transmit video files through the Internet, just like record issuers have to accept MP3 format, and use it to transfer music files online. DXN hopes and plans companies to sell video content online to reach a technology transfer agreement. However, so far, it has not yet reached such an agreement with any major, and even influential movie packages.
Unfortunately, I want to play such a good movie with DivX. There is currently no player to play such an CD. A few days ago, DXN has come to China. The person in charge of this company said that there are many Americans wish to buy DVD playback equipment that use this technology, but there is no one in the world to produce, so he hopes to be able to be with China. DVD manufacturers work together to take out their products during the year and first introduced in the United States.
"How is the world? So small people do?" Just during the smooth development of DivX, DivX's technology was gradually mature, and the business opportunity was infinitely, and a good play was staged. Since DivX technology is not based on the GPL protocol (universal public license, a protocol that is free to use and modify in an open source project), but an LGPL protocol (Note). This is the back door of DXN.
In July 2001, when Encore2 was basically formed, DXN suddenly closed the original code of DivX and released its own product Divx4 on this basis. The foundation of DivX 4 is Encore 2 in OpenDIVX open source, DXN uses DivX's signboard. DNX is doing this, it can be said that all of them don't have a knife. Open source society is like this, they are so innocent.
DXN is hot and hot, soon launched DivX5, but DivX5 did not get more than DivX4, even Bug, more infusable is that this version also charges. Poor, there are so many wisdom and labor of DivX technology, sorrow, and they are unpaid for DNX. This monopoly and has been in Microsoft, which is in a monopoly, DXN wants more hateful and more poisonous.
There are still many people in the world! Justice!
The first is the entire 0DAYZ organization (note) to reject DXN's Divx45. The open source community was "" to determine another portal, gradually re-gathered the development power, on the basis of the OpenDIVX version, once again developed a new MPEG-4 code, decoding software. This is: XVID. From a technical XVID, it has been basically close to Divx5, or it has transcended;
spring is coming:
In recent years, XVID inherits and developed OpenDIVX ENCORE 2, and made its performance, efficiency has improved, and is considered to be the fastest MPEG4 encoding. This is because XVID rewroved all the original code and renewed. In addition, XVID also absorbed the test of the former car, in accordance with GPL release. (It is no longer the previous DivX's LGPL, that is, if you want to use it to make a product, it is illegal) and in 2002, this year, TDX2002 (the world's most famous underground movie distribution organization, annual The latest and high-quality film RIPs that have been released online have received XVID as official standards. This TDX2002 has two formal standards: DivX 3.11 and XVID. DivX 4, 5 like other closed commercial software, is always rejected.
Retribution is coming!
The people who are in the open source software far more than DXN is more than a family, and because of a commercial software company to steal the XVID source code, it is forced to stop developing. Please refer to: http://www.xvid.org;
DivX 4/5 XVID Company DivXNetworks Inc Open Source (GPL Authorization) Info Time In February 2002, Founder Luoda (ROTA) and computer hacking Kil (GEJ) were "涮" TDX2002 certified YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES ODAY Certification NO YES Latest Version 5.02 1.3 Fee Charge Free Compressed Time Long short image quality high, close to DVD high, close to DVD compression capacity Smaller Coded capacity 3.4MB 359K optimization set general powerful adjustability, use this Set a lot of options, respectively, different modes of different movies, respectively. XVID Usage Tips:
There are a lot of articles about XVID compression settings. The options that XVID can be adjusted are fine. Due to space limit, it is no longer discussed herein. Here, I recommend you to use "2-pass" encoding because it gives us more accurate final file size and generates the best quality encoding (in the case where the file size is the same).
The codec installed with only the Divx5 cannot be played by XVID compressed movies. But only XVID coding is installed, you can play Divx5 compressed movies smoothly. But when playing Divx5 movies, the speed cannot be satisfied. Adding ffdShow after the effect is significantly improved. It seems that XVID is still not very perfect in playing Divx5.
Although XVID is coming to the DivX5 battle, there are still some kind of thinner, and the advantage is not very obvious. But the author is very optimistic about XVID. First, it is absolutely open source code, which makes more people invested in XVID development. Also, it completely rewrites the original code of DivX, let the new XIVD to get sperm, renew, new XVID developers have a lot of DivX R & D staff, very clear, rewriting, XIVD The stratum is visible. In addition, Divx4 / 5 is constantly updated, but the function is not high, the advantage is not obvious. XVID is a new force, and it is full of power of revenge. I wish XVID all the way.
The history of the XVID version:
1.0 February 17, 2002 First Edition (SMOOTHING) technology 1.3 March 8, 2002 About NIC's Xvid DirectShow Filter Detail 1.3 July 23, 2002 According to Nic's XVID CODEC correction supplementary part content ( At present, the latest version)
A small knowledge about DivX origin:
This technique called DivX is created by a 27-year-old Audiovisual enthusiast Roca (ROTA) and computer hackper Kil (GEJ).
The technique of the original DivX did not invented these two people, they were just a pirated genius. With the big line of Wind OWS, Microsoft has developed MPEG-4 technology to compress video file file capacity to small. Roda and Kil will rewrite the program, but rename it to DivX, and put it on the Internet. Microsoft claims to investigate all people who promote DivX development. However, Roda is fully applied to legalize their DivX. Since DivX is inventive from Windows, it has not been used with any Microsoft technology. Moreover, he is more interested in some technicians and financial personnel in the United States, and the new company projectmayo.com fully promotes DivX.
In fact, DivX is another way of saving of video DVDs, depending on the DECSS program (note). Because DV D itself has anti-copy tags, let DVD can't copy it in the computer, but Decss can decode it, which makes it copy, compresses into Divx movies. In response to this practice, major filmmakers will take immediate action to prevent DECSS outflow and spread, but are too late, decss are Yahoo! Can be found on Google. Glossary:
Decss program: Joe. Johnson prepared a small procedure, only 57k, not only shocked Hollywood, but also triggered countless legal disputes. He created the "little magic mons", now has become the most hated of Hollywood producers. The DECSS program can copy genuine encrypted DVD movies to your computer's hard drive. It also uploads these movies to the Internet.
MPEG-4 technology: It is a new low yard ratio, high compression ratio video coding standard, with a transmission rate of 4.8 ~ 64kbit / s, which is small in storage. The current technology of DivX (the latest XVID) movies is now widely used.
GPL protocol: Universal public license, a protocol that guarantees free use and modification in an open source project.
LGPL protocol: The secondary GPL (LESSER GPL), like GPL, is a public license. The maximum difference from GPL is that it allows private.
FfDSHOW: A playback software that supports XVID, MPEG4-V3 MPEG4-V2 and DivX all versions, accounting for less CPU resources.
