DVD-5

Introduction

The disc has only one side, and only one layer has data on it. The D5 disc can be used to play a 100-minute movie with Dolby Digital Surround sound system and two text subtitles.

Principle

DVD uses MPEG2's VBR format to compress images. It is a dynamic variable data stream compression ranging from 1M to 9.8M. The largest data stream totals It can reach 10.8M, which is very different from the previous VCD. VCD adopts CBR format, the data stream is fixed, and the length of the movie stored on each disc is also fixed; while the length of the movie stored on DVD can be changed, the data stream used is small, and the time is relatively longer. , On the contrary, if the data stream is large, the length of the stored video is short. This is also the main reason why the quality of DVD9 is higher than that of DVD5.

Comprehensive comparison

The main performances of DVD9 over DVD5 are as follows:

First, large capacity and high picture quality. The capacity of DVD9 is almost twice that of DVD5. For movies of the same length, DVD9 can use large data stream compression to ensure the quality of the picture. In order to accommodate the entire movie, DVD5 can only reduce the data stream and sacrifice the picture. Quality. Generally speaking, DVD5 can store about 100 minutes of film, and its picture quality can be guaranteed. Although the DVD standard is 133 minutes, it also depends on the quality of the original material, and the quality of 133 minutes of storage is sometimes not up to the standard. DVD standard. The capacity of DVD9 is just suitable for the actual situation in China. The large capacity can maximize the collected data stream, make up for the lack of original materials, and give you a real DVD experience!

Second, advanced technology and copyright protection. The technical content of DVD9 is quite high in both production and production. The production technology of DVD5 has matured. In the pirated market, most of them are DVD5. The production complexity of DVD9 is much higher than that of DVD5. There can be no errors in every step and option in the whole process. There is still a major problem in the detection of DVD9. DVD-R can burn DVD5. DVD9 has no way to burn temporarily, so the detection is relatively To be more cumbersome, a little more time. The engraving and disc pressing technology of DVD9 has not been perfect in China, and only a few manufacturers can produce it. Relatively speaking, there are many more DVD5 manufacturers.

Three, the content of the program is rich. Generally speaking, the content of DVD5 is relatively simple, and it has not yet reached many functions in the DVD standard. DVD9 products have added some real DVD functions, including a series of functions such as multiple languages, multiple subtitles, and multiple angles, allowing consumers to truly appreciate the advantages of DVD.

Four, high quality. The overall quality of DVD9 is higher than DVD5. DVD9 uses pure gold as the reflective layer, which is golden in appearance, while DVD5 is silver.