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The video multiplexer structures the compressed data into a hierarchical
bitstream that can be universally interpreted.
The hierarchy has four layers:
- 1.
- Picture layer : corresponds to one video picture (frame)
- 2.
- Group of blocks: corresponds to 1/12 of CIF pictures or 1/3 of QCIF
- 3.
- Macroblocks : corresponds to 16x16 pixels of luminance and the two
spatially corresponding 8x8 chrominance components.
- 4.
- Blocks: corresponds to 8x8 pixels
Jon CROWCROFT
1998-12-03