Macroblock

Macroblock is a processing unit in image and video compression formats based on linear block transforms, such as the discrete cosine transform (DCT). A macroblock typically consists of 16├Ś16 samples, and is further subdivided into transform blocks, and may be further subdivided into prediction blocks. Formats which are based on macroblocks includ...
Found on http://en.wikipedia.org/wiki/Macroblock

Macroblock

A macroblock is a portion of image that consists of 16x16 picture elements (pixels or pels). At the macroblock layer motion compensation and prediction are performed and it's possible to change the quantisation step. It must be noticed that, if the picture is an interlaced frame picture, the odd lines of the macroblock belong to the first field and...
Found on http://www.videohelp.com/glossary?M
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