Video codec

A video codec is software or hardware that compresses and decompresses digital video. In the context of video compression, codec is a portmanteau of encoder and decoder, while a device that only compresses is typically called an encoder, and one that only decompresses is a decoder.

Codec packs[edit]

Online video material is encoded by a variety of codecs, and this has led to the availability of codec packs — a pre-assembled set of commonly used codecs combined with an installer available as a software package for PCs, such as K-Lite Codec Pack, Perian and Combined Community Codec Pack.

Applications[edit]

Video codecs are used in DVD players, Internet video, video on demand, digital cable, digital terrestrial television, videotelephony and a variety of other applications. In particular, they are widely used in applications that record or transmit video, which may not be feasible with the high data volumes and bandwidths of uncompressed video. For example, they are used in operating theaters to record surgical operations, in IP cameras in security systems, and in remotely operated underwater vehicles and unmanned aerial vehicles. Any video stream or file can be encoded using a wide variety of live video format options. Here are some of the H.264 encoder settings that need to be set when streaming to an HTML5 video player.^[12]

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Archived 2011-09-30 at the Wayback Machine describes another algorithm for video compression that performs close to the Slepian–Wolf bound (with links to source code).

Wyner-Ziv Coding of Video

—optional download (formerly called ATI Avivo)

AMD Media Codecs

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Bit rate

Comparison of video codecs

Data compression § Video

Display resolution

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