90 What are start codes? (MPEG-2)
Description
This article is from the MPEG FAQ, by Frank Gadegast phade@cs.tu-berlin.de with numerous contributions by others.
90 What are start codes? (MPEG-2)
These 32-bit byte-aligned codes provide a mechanism for cheaply
searching coded bitstreams for commencement of various layers of video
without having to actually parse variable-length codes or perform any
decoder arithmetic. Start codes also provide a mechanism for
resynchronization in the presence of bit errors. A start code may be
preceded by an arbitrary number of zero bytes. The zero bytes can be
use to guarantee that a start code occurs within a certain location, or
by rate control to increase the bitrate of a coded bitstream.
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