MPEG-4 was developed by Moving Picture Experts Group to stream multimedia video and audio at lower data rates and smaller file sizes. MPEG-4 has the same algorithm of compression that Mpeg-1 and MPEG-2 but was expanded to support video/audio "objects", low bitrate encoding and 3D content, text and other media types.
MPEG-4 influenced much the following three fields: interactive multimedia (including the products distributed on disks and via web), interactive graphic applications (synthetic content) and digital television - DTV.
The compression of data is made according to the following scheme. Codec does not save all the frames, but only the key ones and the changes that took place in the intermediate frames. The audio data is often compressed to MP3, Ogg Vorbis or WMA.
The advantage of MPEG-4 is the ability to compress a two-hour video to a CD, and the result will be of high quality. Thanks to it MPEG-4 has become extremely popular with users. Todays MPEG-4 is supported by a large number of different devices from satellite television to cell phones.
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