The full name of MPEG is the Moving Picture Experts Group (MovingPictureExpertsGroup), is devoted to the development of multimedia in the field of international standards of an organization. The organization was founded in 1988 by some 300 world experts in multimedia technology. Including MPEG video, MPEG audio and MPEG systems (video and audio sync) in three parts. MPEG compression standard is designed for motion picture, the basic approach is - in units of time collecting information and save the first frame, and then store the rest of the frame on only the relative changes in the first part of the frame in order to achieve the purpose of compression. MPEG compression standard can be compressed between the frame, the average of up to 50:1 compression ratio, compression ratio is relatively high, and have a unified format, good compatibility. Recommended: FlvixFLV download streaming video conversion step in the completion of.
Multimedia data compression standards, more use of MPEG series of standards, including MPEG-1, 2,4 and so on. MPEG-1 (ISO/IEC11172) is the MPEG organization in 1992, first put forward by the impact of a broad multi-media international standards. MPEG-1 standard is formally known as the "media campaign based on the digital storage of image and sound compression standard", we can see, MPEG-1 focus on resolving the issue of multi-media storage. Due to the success of MPEG-1 for the purpose of VCD and MP3 as the representative of the MPEG-1 product in the rapidly growing popularity around the world.
Following the successful development of MPEG-1 after, MPEG organization launched in 1996 to resolve the issue of multimedia transmission of MPEG-2 standard. MPEG-2 is formally known as the "common compression standards image and sound." MPEG-2 standard is the most eye-catching digital TV set-top boxes and DVD. Since then, MPEG did not stop the pace of progress in January 1999 the ISO published the MPEG-4 (video and audio compression object) of the first edition of the standard, and then in December 1999 announced that this standard of the second version. MPEG-4 full ISO name for ISO/IEC14496. MPEG-4 in May 1991 the first time, in July 1993 launched in January 1999 as an international standard, has experienced up to 6 years of research and discussion.
MPEG-1 for the transmission of data transmission rate of 1.5Mbps digital storage media, motion picture and sound encoding, the MPEG-1 compression standard, video data compression rate of 1/100-1/200, audio compression ratio of 1 / 6.5. MPEG-1 to provide 30 frames per second, 352 * 240 resolution image, when using compression techniques when appropriate, with close to home video formats (VHS) video quality. MPEG-1 to allow more than 70 minutes of high-quality video and audio stored on a CD-ROM disk. VCD is used in the MPEG-1 standard, which is a family-oriented TV-quality video, audio compression standard.
MPEG-2 mainly for high-definition television (HDTV) needs, transmission rate of 10Mbps, compatible with the MPEG-1 for 1.5-60Mbps or even higher range of the encoding. MPEG-2 there are 30 frames per second 704 * 480 resolution, MPEG-1 is four times the playback speed. It is suitable for demanding broadcast and entertainment applications, such as: DSS satellite broadcasting and DVD, MPEG-2 is a home video format (VHS) video resolution twice.
MPEG-4 standard is the ultra-low bit-rate motion image compression standard and the language used to 64kbps transfer rate is lower than the real-time video transmission, it can cover not only low-frequency band, but also to the development of high frequency band. Than the previous two standards, MPEG-4 data compression for multimedia provided - a much wider platform. It is a more defined format, a framework, rather than specific algorithms. It can be a wide range of multimedia technology into full use, including compression own tools, algorithms, including image synthesis, speech synthesis technology. MPEG-4 from the date on the proposed cause for concern, although not everyone is clear of its specific objectives, but have it placed a great deal of hope. MPEG-4's biggest innovation is to empower the user application's ability to establish a system, rather than use a fixed standard for the application. In addition, MPEG-4 will be integrated as much as possible of the data types, such as natural and synthetic data in order to achieve a variety of transmission media content in support of reciprocal expression. With MPEG-4, the first time, we may establish a personalized audio-visual system.
MPEG-7 standard is known as "Multimedia Content Description Interface", for all types of multimedia information to provide a standardized description, which describes itself with the content, allowing rapid and effective information of interest to the user query. It will expand the existing content-specific solutions to identify a limited capacity, in particular, it also includes more data types. Other words, MPEG-7 provides that a used to describe different types of multimedia information of the standard collection of descriptors. The standard was put forward in October 1998.
MPEG-21 is the latest development of MPEG level. It is a heterogeneous network support and equipment through to enable users to the widespread use of transparent and standard multi-media resources, and its goal is to establish a framework for interactive multimedia. MPEG-21 to the people of the technical report paints a future scenario of the multimedia environment, the environment can support a variety of applications, different users can use and transmission of all types of digital content. Can also say, MPEG-21 is a response to the realization and protection of intellectual property management with the ability of the number of technical standards for multimedia content.
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