Analysis of the difference between DVD9 and DVD5 _ Application techniques

The DVD can be divided into the following categories: DVD5, DVD9, DVD10 and DVD18, with capacity of 4.7G, 8.5G, 9.4G and 17G respectively. DVD9 is one of the formats on DVD capacity.
DVD uses MPEG2 VBR format compression image, it is a dynamic variable data flow compression, ranging from 1M to 9.8M, the largest data flow can reach 10.8M, it and the past VCD has a big difference. VCD using CBR format, the data stream is fixed, the length of the film stored in each disc is fixed, and the length of the DVD storage film can be changed, the data stream is small, the time is relatively longer, the contrary data flow is large, the length of the film stored is short. This is the main reason why the quality of DVD9 is higher than DVD5.
At present, the main performance of DVD9 superior to DVD5 is as follows:
One, large capacity, picture quality is also high. DVD9 capacity is almost twice times the capacity of DVD5, for the same length of the film, DVD9 can use large data stream compression to ensure the quality of the screen, and DVD5 in order to accommodate the entire film, you can only reduce the data flow, sacrificing the quality of the picture. In general, DVD5 can store about 100 minutes of film, the quality of the picture can be guaranteed, although the DVD Forum standard is 133 minutes, but it also depends on the quality of the original material. At present, the DVD in China has not been popular, the production of the material is mostly the past VCD era things. Therefore, the quality of storage for 133 minutes is still not up to the standard of the DVD. DVD9 capacity is just suitable for China's actual situation, large capacity, you can try to improve the collection of data flow, to make up for the lack of original material, give you a real DVD feel!
Second, advanced technology, protection of copyright. The technical content of DVD9 is quite high both in production and in manufacturing. DVD5 production technology has matured, the current piracy market, the vast majority of DVD5. and DVD9 production complexity is far higher than DVD5, the whole process of each step and options can not be wrong, for the moment, DVD9 detection there is a major problem, now DVD-R can burn DVD5,DVD9 temporarily have no way to burn, so the detection is relatively cumbersome, Time to be a little more. DVD9 and disc technology is not yet perfect in China, only a handful of manufacturers can produce. DVD5 manufacturers are relatively much more.
Third, the program is rich in content. Generally speaking, DVD5 content is relatively single, has not reached the DVD standard of many functions. From the previous VCD look, just in the product quality improvement, and not too many functions. DVD9 products Add some real DVD features, including multiple languages, subtitles, Multi-angle and a series of functions, so that consumers can really appreciate the advantages of the DVD.
Four, high quality. The overall quality of DVD9 is higher than DVD5. DVD9 uses pure gold as a reflective layer, which is golden in appearance, while DVD5 is silver.