91 Coded block pattern (MPEG-2)
Description
This article is from the MPEG FAQ, by Frank Gadegast phade@cs.tu-berlin.de with numerous contributions by others.
91 Coded block pattern (MPEG-2)
Coded block pattern:
(CBP --not to be confused with Constrained Parameters!) When the frame
prediction is particularly good, the displaced frame difference(DFD, or
temporal macroblock prediction error) tends to be small, often with
entire block energy being reduced to zero after quantization. This
usually happens only at low bit rates. Coded block patterns prevent
the need for transmitting EOB symbols in those zero coded blocks.
Coded block patterns are transmitted in the macroblock header only if
the macrobock_type flag indicates so.
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