Wang Anran's solution is very simple to say, based on a basic principle, that is, the requirements for the compression ratio of the film's still picture and the moving picture are different, and maintaining a high bit rate under the static and gradual picture changes is a waste of the film's storage space.

Based on this principle, the goal of compression can be clarified, and as for the software and hardware solutions to be solved, compared with CPU design, it is basically the difference between kindergarten and doctorate.

Video format, you can refer to svcd and rmvb format to take rmvb format with high compression rate, but can not add subtitles, take svcd compatibility, video decoding protocol can be compatible with VCD, plus network streaming media interface, predetermined 1024 * 768 resolution, adaptive to other resolutions, audio lossless CD sound quality.

Wang Anran spent three days,Write a compression and decoding protocol,And compatiblewin3.1,DOS,Under the excuse of DOS,Wrote a set of cvd compression program,Decode and play program,Find three digital Hong Kong film sources in Zhongguancun,Three discs,120 minutes,After compression,Basically in more than 600M capacity,Just a CD can be loaded,But the quality and VCD are very different。

Basically, it is the picture quality of DVD, the sound quality of CD, but the file size of VCD.

To do all this, Wang Anran used the school's recorder to burn three videos and software on four discs, according to his calculations, the decoding software can be pre-installed on the computer with the Pentium processor, with the help of the Pentium processor for hardware decoding.

plus a letter, sent directly from the post office to Jiang Wanmeng of Anhui TV Station, in order to increase the weight, Wang Anran added a title to himself.

"Chairman of the Video Compression and Decoding Research Committee of Qingda University. ”

After finishing this, Wang Anran continued to devote himself to the work of chip design software, and 500% software outsourcing was distributed one after another within half a month, and in the name of Jia Guofang's salon association, a deposit of 500 yuan was charged for each software, which was also forcibly added by Wang Anran.

Originally, it was set higher, but considering that most students do not have too strong financial strength, this is also for fear that some people will not do anything about the software package and affect the overall progress.

Functional software can be outsourced, but the core code still needs to be done by Wang Anran himself, involving instruction set model, architecture model design, transistor parameter setting, communication protocol, and even the most basic machine language model, all of which need to be written by Wang Anran code by code.

The intense work seemed to lose track of time, and five days later, Jiang Wanmeng's office received a package.

"Mr. Jiang, this is President Wang of the Qingda Video Compression and Decoding Research Association, indicating the package sent to you. ”

"What kind of research meeting is Qingda video?" Jiang Wanmeng looked puzzled.

"Mr. Jiang, you better take a look for yourself, the package indicates that it was opened by Mr. Jiang himself. ”

Jiang Wanmeng opened the package suspiciously, it was a letter and four CDs......

"Mr. Jiang, I am Wang Anran, I heard that Wanyan Company is carrying out VCD research and development work, as a hobby of video compression and decoding, I yearn for it.

The CD that came with the package is my latest research, and if you have a Pentium processor microcomputer, please be sure to test it out, thank you very much. By the way, please be sure to use the latest high-definition TV ...... when testing"

............

"Mr. Jiang, I was looking for you, the mass production of VCD is basically completed, next month, the first batch of 1,000 units will be shipped, I don't know how this sales docking, whether the TV station can open some resources for publicity. ”

Sun Yansheng said as he sat down on the sofa generously, and Jiang Wanmeng's secretary immediately made tea.

"Mr. Sun, you don't have to worry about sales, Wan Yan just released a little news, the first batch of 1,000 units has been booked, at that time, I still think that 5,000 yuan per unit, is the price higher, now it seems that the price is low. ”

"It seems that Mr. Jiang has a unique vision, and the market potential of VCD in the mainland can be seen. ”

"This is also with the help of Mr. Sun's patent, first now, technology is king. ”

Sun Yansheng nodded, in terms of technology, he is proud, the research and development of VCD is basically done by Sun Yansheng, and the Chinese side only contributed a little money, but in the allocation of shares, it accounted for the majority.

Seeing that the prospects of the VCD market are very good, the foreseeable profit must be very expensive, which gives Sun Yansheng the biggest feeling that this business is a loss.

"Mr. Jiang has won the award, by the way, what is the matter with you calling me over?"

Jiang Wanmeng took out the CD, Wanyan Group happened to have a Pentium microcomputer that he had just bought, but in the entire Chinese side, few people could operate it.

Sun Yansheng is naturally no stranger to microcomputers, under a series of DOS commands, he found the executable file in the CD, installed it directly, and the graphical window of the program appeared on the computer monitor.

This looks like video decoding software,I'm not mistaken, the person who wrote the software,There must be a good software programming skills,The whole software is only 3.7m,I don't know how the function is。

Sun Yansheng has extreme confidence in VCD, in his opinion, VCD is the best solution for both video size and quality, and this amateur software based on video enthusiasts, since it can be hard decoded on the microcomputer, the picture quality must be very poor, and even whether you can see the figure can not be guaranteed.

"Mr. Jiang, my time is limited, so don't bother me in the future for such a thing. ”

Sun Yansheng put down the disc, these boring tests, he couldn't arouse his interest at all, just a moment ago, surprised by the exquisite design of the video software.

"Mr. Sun, since you're here, it's okay to take a look. ”

Sun Yansheng's attitude made Jiang Wanmeng very unhappy, but he couldn't help it, who let the family master the technology, so to speak, Jiang Wanmeng left Sun Yansheng and couldn't play anything.

Open the CD, put the disc into the CD drive, the software will automatically read the data in the CD, and after a few seconds, the content of the video will be automatically played in the CD......

"How is it possible, this picture quality ...... Can it be decoded by hardware?"

Sun Yansheng hurriedly checked the progress bar, 124 minutes.

"Impossible, 124 minutes of high image quality, how can it be crammed into this mere 700m space, it must be that the picture quality in the front is good, the picture quality in the back is poor, the Chinese people have a good face, they always like to do something on the surface, it must be like this. ”

The video software has a fast-forward function, and Sun Yansheng hurriedly adjusted it to 16 times the speed of fast forward.

After all, it's the original Pentium, and the support for video is limited, and the computer is stuck, but it doesn't affect the fast-forward video.

A few minutes later, Sun Yansheng's face was like ashes.

"How is this possible, the quality of the video compression is very high, consistent, but how does it achieve such high image quality?"

Sun Yansheng didn't understand.

Jiang Wanmeng also vaguely guessed something, and whispered to Sun Yansheng: "Mr. Sun, the other party proposed that it would be better to use it on the latest high-definition TV." ”

“？？”

"400*300 display resolution, isn't it the limit? I happen to have a Sony latest BV180 TV in my dormitory, please ask someone to move over......"