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Updated 21/11/2012Home » Video Glossary » Sequence

Sequence

A sequence consists of all the pictures that follow a sequence header till a sequence_end_code.

Encoding and displaying parameters are transmitted with the sequence header. The sequence header can be repeated in order to allow random access, but all the data elements of the repeated sequence header, except those concerning quantisation matrices, must have the same values as in the first sequence header.

The repeated sequence header must precede in the bitstream either an I-picture or a P-picture. In the case that random access is performed to a P-picture, it's possible that the decoded pictures may not be correct.