MPEG Compressor

You may need to compress MPEG video for many different reasons - to save space in the device's memory or to transfer a file over the Internet. In any case, you need a good compressor that will do its job at the highest level. Modern video compression algorithms differ from image compression algorithms with which you may be familiar. The extra dimension and time means that various mathematical and logical methods are applied to the video file to reduce the size while maintaining the video quality. Video compression algorithms look for spatial and temporal redundancy. By encoding redundant data a minimum number of times, the file size can be reduced. Imagine, for example, one minute as the character's face slowly changes its facial expression. It doesn't make sense to encode a background image for each frame: instead, you can encode it once and then refer to it until you know the video is changing. This inter-prediction coding is responsible for artifacts that interfere with the compression of digital video: parts of the old image move with the wrong action because something in the coding has become useless.

In January 1988, an expert working group on coding of moving images was formed within the framework of the joint information technology technical committee JTC1 of the International Organization for Standardization ISO and the International Electrotechnical Commission IEC, which was tasked with developing standards for image and sound coding with the aim of eliminating redundancy. MPEG compression standards were developed by Moving Picture Experts Group. This technology defines the compression standards for both audio and video information and makes it convenient for transmission in broadcast. There are many versions of the format - MPEG-1, MPEG-2, MPEG-3, MPEG-4, etc. MPEG-1 is a lossy compression standard for video and audio. It is designed to compress VHS. Perhaps everyone is familiar with the MPEG-2 format. It is this format that underlies DVD-Video discs. The MPEG-2 format is also the basis for digital television standards. The MPEG3 standard was originally developed for use in High Definition Television (HDTV) systems with a data rate of 20-40 Mbps. The new MPEG4 standard, which appeared at the very end of 1999, offers a broader view of media reality. The standard defines the principles for working with content (digital representation of media data) for three areas: interactive multimedia itself (including products distributed on optical discs and over the Internet), graphics applications (synthetic content) and digital television (DTV).