Sunday, August 29, 2010
MPEG - MOVING PICTURE EXPERTS GROUP
Its the working group of ISO (International Organization for Standardization) in charge of the development of standards for coded representation of digital audio and video. Established in 1988, the group has produced
- MPEG-1, the standard on which such products as Video CD and MP3 are based.
- MPEG-2, the standard on which products such as Digital Television set top boxes and DVD are based.
- MPEG-4, the standard for multimedia for the fixed and mobile web.
This technology covers coding of moving pictures and associated audio for digital storage media at up to about 1.5 Mbit/s. In easier terms, it’s a compression technique which helps in compressing audio and movie files on a digital disc (CD) at a compression rate of 1.5 Megabits/second. This makes it possible for use to watch a movie on a regular 13 Rupee CD on our CD players.
MP3 (MPEG 1 layer 3) forms a part of this particular standard. Using MP3, one can compress an audio file (for example) 30 MB in size to just 4-5 MB. This saves memory and thus large amount of data can be stored on a limited storage media (like CD).
MPEG 2 standard (1995)MPEG 2 is the file compression technique which involves higher data rates with much better quality. This happens because of extra high compression (encoding can go upto 40 Mbps). Apart from that since the frames supported are larger, the quality of the video seen on a MPEG-2 disc (DVD) is almost like what we get to see in a theatre.
MPEG 4 standard (1997-99)
Higher Quality compression (compression can go upto 1 Gbps). Ideal for real time video/mobile video streaming as the compression is much higher but advance techniques ensure zero loss in quality. The quality of the video is almost real. It was created with mobile data transmission in mind.
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