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A device that converts analog signals to digital form for transmission and converts signals traveling in the opposite direction from digital to analog form. Derived from coder-decoder.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


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(1) (COder/DECoder) A hardware circuit that performs analog-to-digital conversion (ADC) and/or digital-to-analog (DAC) conversion. When a digital device receives analog signals from a microphone, VHS tape or other analog source, the ADC converts them to digital audio samples and video frames. Generally, the results are further compressed to save bandwidth (see definition #2).

(2) (COmpressor/DECompressor) Software and/or hardware that compresses digital audio and video data in order to reduce file size. Compressed files can be transmitted faster and stored in less space. For example, a song on a CD can be reduced to 10% of its original file size using MP3 compression (see MP3). The size of a movie/video file is dramatically reduced using various compression techniques (see video format).

Video formats generally use one codec, which may comprise several quality levels. "Container formats," such as Apple's QuickTime and Microsoft's AVI, support a variety of codecs (see container).

The goal of codec designers is to maintain audio and video quality while compressing the binary data further. Lossy methods are widely used, which actually discard bits that most people cannot hear or see. See lossy compression, codec examples, companding and codec switching.

(3) (COmpressor-DECompressor) A general data compression algorithm; for example, a "Zip codec." The term may also be applied to the built-in algorithms used to create and render images such as GIFs and JPEGs. See data compression.
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Fluendo codec pack 18 is currently operational on Fedora 18, Ubuntu 13.04 (available in April 2013), and Open Suse 12.3.
A very old codec pack, outdated version of a game, and an outright obsolete Java library were some of the many outdated software on our machine, that were brought to our kind notice by SUMo (short for Software Update Monitor), the friendly neighbourhood free utility.
San Francisco, CA, September 29, 2011 --( One of the most outstanding features of the Fluendo Codec Pack Release 15 is the support for AMD GPUs through the XvBA using OpenGL for efficient video rendering.
Geneva, Switzerland, February 14, 2011 --( Swiss software publisher Axel Rietschin Software Developments released an updated version of its FastPictureViewer Codec Pack product, a Microsoft Windows add-in enabling users to display raw images from more than 350 digital camera models, as well as Adobe DNG and Adobe Photoshop documents, directly from Windows Explorer without launching a dedicated application.
Elecard offers codec packs for licensing and solutions for digital TV industry, such as software servers for real-time encoding, Internet streaming, and video on demand services, as well as set-top boxes and capture cards.