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.
Contributor(s): Molly Ruggles
This was last updated in September 2005
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