What is the application field of MPEG-2 standardby blazevideo
Main application field of MPEG-2 is as follows:
(1) video and audio data storage
All along, television programs, audio and video data are all saved with the tape. This approach has many drawbacks: vulnerability, take too much space, hard to reuse. More importantly, it is difficult to save data for a long-term, it is difficult to position, hard to share. With the development of computer technology and video compression technology, high-speed broadband computer networks and large-capacity data storage systems to the network television programs to store, query, share, exchange are possible now.
Compressed using MPEG-2 encoding DVD disc, brought new hope to the data saving. Television programs, audio-visual information, etc. can be encoded by MPEG-2 encoding system, save the low-cost CD-R disc or a high-capacity rewritable DVD-RAM, can also be edited using DVD software and make a standard DVD disc, can save money and storage space.
In the TV broadcast is part of a nexus of the digital broadcast system, reform is necessary, one of the most crucial step is to build the hard disk broadcast system. Automatic MPEG-2 hard drive series broadcast by broadcast system is simple to operate, with high storage capacity, video index advantages, was welcomed by people of all ages. But in the past because of MPEG-2 broadcast equipment is very expensive. With the development of MPEG-2 technology and related product costs down, MPEG-2 hard drive is expected to be popular broadcast automation system.
(3) television programs and its network of nonlinear editing system
In the non-linear editing system, the program material stored in digital compression, production and broadcast, video compression technology is the technical basis of non-linear editing system. At present, there are M-JPEG and MPEG-2 digital compression format.
M-JPEG technology which known as compression technology of movement still images (or frame), can be frame-accurate editing, but the compression efficiency is not high.
MPEG-2 uses inter-frame compression method, only the I frame are compressed, B frames and P frames are obtained through the detection, therefore, most data transmission and computing time by the correlation between frames are relatively for a small amount of data that can achieve higher compression ratio. Problems with the frame by frame editing, MPEG-2 will be widely used non-linear editing system, and greatly reduces editing costs, the MPEG-2 compression is a standard, the compression devices of different manufacturers design data can be compressed by other manufacturers design decompressor to decompress, to ensure that the manufacturers of the devices is fully compatible.
As a result of MPEG-2 IBP video compression technology, doubling the amount of data reduction, reducing storage costs and increase data transfer speeds, reducing the network bandwidth of the computer bus and the pressure of formation of non-linear editing can be pure Ethernet network system has become possible in the current Ethernet is the most mature network, system management is perfect, the price is relatively low.
MPEG-2 based on nonlinear editing systems and nonlinear editing network will become the future direction of development.
(4) satellite transmission
MPEG-2 has been approved by ISO, and was widely applied in the broadcasting field such as digital satellite video broadcasting (DVB-S), DVD disc and video conferencing. Currently, the world's tens of millions of DVB-S users, DVB-S signals using MPEG-2 compression format encoded for transmission via satellite or microwave, in the client by the MPEG-2 decoders decode the satellite receiver, for users to watch. In addition, the use of MPEG-2 compression technology, you can also program the remote TV news or the transmission and exchange.
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Created on Oct 28th 2010 22:50. Viewed 193 times.