What is H.264 (MPEG-4 AVC)? - Definition from WhatIs.com


H.264 (MPEG-4 AVC)

Part of the Computing fundamentals glossary:

H.264, also known as MPEG-4 AVC (Advanced Video Coding), is a video compression standard that offers significantly greater compression than its predecessors.

The standard offers up to twice the compression of MPEG-4 ASP (Advanced Simple Profile). In addition to improvements in perceptual quality, the H.264 standard can provide DVD-quality video at under 1 Mbps.

The enhanced compression and perceptual quality of H.264 are obtained by motion estimation, which minimizes temporal redundancies; intra estimation, which minimizes spatial redundancies; transformation of motion estimation and intra estimation into the frequency domain; reduction of compression artifacts; and entropy coding, which assigns a smaller number of bits to frequently encountered symbols and a larger number of bits to infrequently encountered symbols.

This was last updated in September 2005
Contributor(s): Molly Ruggles
Posted by: Margaret Rouse

Related Terms


  • Turing test

    - In artificial intelligence (AI), the Turing Test is a method for determining whether or not a computer is capable of thinking like a human. (WhatIs.com)

  • telepresence

    - Telepresence is a sophisticated form of robotic remote control in which a human operator has a sense of being in a remote location so that the experience resembles virtual reality (VR). (WhatIs.com)

  • gravity wave (or gravitational wave)

    - A gravity wave (or gravitational wave) is a ripple in the curvature of the space-time continuum (the enmeshed combination of our three perceived physical dimensions, plus time) created by the movem... (WhatIs.com)


  • Computing fundamentals

    - Terms related to computer fundamentals, including computer hardware definitions and words and phrases about software, operating systems, peripherals and troubleshooting.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question About H.264 (MPEG-4 AVC)Powered by ITKnowledgeExchange.com

Get answers from your peers on your most technical challenges

Tech TalkComment



    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.