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Context-adaptive binary arithmetic coding

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Context-adaptive binary arithmetic coding (CABAC) is a form of entropy coding used in H.264/MPEG-4 AVC video encoding. As such it is an inherently lossless compression technique. It is notable for providing considerably better compression than almost any other similar encoding scheme used in video encoding and is considered one of the primary advantages of the H.264/AVC encoding scheme. CABAC is only supported in Main and higher profiles and requires a considerable amount of processing to decode compared to other similar algorithms. As a result, Context-adaptive variable-length coding (CAVLC), a lower efficiency entropy encoding scheme, is sometimes used instead to increase performance on slower playback devices.

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