89 How do you tell an MPEG-1 bitstream from an MPEG-2 bitstream ?
Description
This article is from the MPEG FAQ, by Frank Gadegast phade@cs.tu-berlin.de with numerous contributions by others.
89 How do you tell an MPEG-1 bitstream from an MPEG-2 bitstream ?
All MPEG-2 bitstreams must contain specific extension headers that
immediately follow MPEG-1 headers. At the highest layer, for example,
the MPEG-1 style sequence_header() is followed by sequence_extension().
Some extension headers are specific to MPEG-2 profiles. For example,
sequence_scalable_extension() is not allowed in Main Profile
bitstreams.
A simple program need only scan the coded bitstream for byte-aligned
start codes to determine whether the stream is MPEG-1 or MPEG-2.
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