Video coding is the field in computer science that deals with finding efficient coding formats for digital video. Computer science - Wikipedia, the free encyclopedia /**/ @import /skins-1. ... Digital video is a type of video recording system that works by using a digital, rather than analog, representation of the video signal. ...

Video data usually not only contains visual information but also audio. Therefore, it is often referred to as multimedia. Modern video coding standards even include other multimedia data such as synthetic computer graphics, text and meta information for searching/browsing and digital rights management. They also often provide mechanisms for user interaction. Digital audio describes sound recording and reproduction systems which work by using a digital representation of the audio waveform. ... Multimedia is the use of several different media to convey information (text, audio, graphics, animation, video, and interactivity). ... Computer graphics (CG) is the field of visual computing, where one utilizes computers both to generate visual images synthetically and to integrate or alter visual and spatial information sampled from the real world. ... Digital rights management (DRM) is the umbrella term referring to any of several technical methods used to handle the description, layering, analysis, valuation, trading and monitoring of the rights held over a digital work. ...

However, the most intensive parts of video data in terms of data size (memory demand, transmission bandwidth) remain (visual) video and audio data. These parts have to be compressed. Unfortunately, this can hardly be done without loss of quality (lossy compression), because of the enormous size of a lossless video stream. There are two special research areas that deal with multimedia compression: video compression and audio compression. In computer science, data compression or source coding is the process of encoding information using fewer bits (or other information-bearing units) than a more obvious representation would use, through use of specific encoding schemes. ... A lossy data compression method is one where compressing a file and then decompressing it retrieves a file that may well be different to the original, but is close enough to be useful in some way. ... Multimedia compression is a general term referring to the compression of any type of multimedia, most notably graphics, audio, and video. ... Video compression deals with the compression of digital video data. ... Audio compression can mean two things: Audio data compression _ in which the amount of data in a recorded waveform is reduced for transmission. ...

Video coding has two distinct goals: storing and transmission of video data. These two goals have much in common. Therefore, video file formats usually have the same structure as streaming video formats with just a little header information added. A video file format is a standard for encoding digital video, audio and some auxiliary information (metadata) into a file. ... Streaming media is media that is consumed (read, heard, viewed) while it is being delivered. ...

A computer program that encodes and decodes video data is called video codec. (The part that only deals with audio data is called audio codec.) A video codec is a device or software module that enables the use of compression for digital video. ... An audio codec is a computer program that compresses/decompresses digital audio data according to a given audio file format or streaming audio format. ...

Almost all successful techniques developed for video coding have been integrated in the MPEG standards. Therefore, the MPEG standards represent a comprehensive knowledge base for video coding. Most video coding standards and commercial formats are modifications of MPEG. The Moving Picture Experts Group or MPEG is a working group of ISO/IEC charged with the development of video and audio encoding standards. ...