94 What's the deal with End of Block ? (MPEG-2)
Description
This article is from the MPEG FAQ, by Frank Gadegast phade@cs.tu-berlin.de with numerous contributions by others.
94 What's the deal with End of Block ? (MPEG-2)
Saves unnecessary run-length codes. At optimal bitrates, there tends
to be few AC coefficients concentrated in the early stages of the
zig-zag vector. In MPEG-1, the 2-bit length of EOB implies that there
is an average of only 3 or 4 non-zero AC coefficients per block. In
MPEG-2 Intra (I) pictures, with a 4-bit EOB code in Table 1, this
estimate is between 9 and 16 coefficients. Since EOB is required for
all coded blocks, its absence can signal that a syntax error has
occurred in the bitstream.
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