This document specifies the syntax and semantics of video usability information (VUI) parameters and
supplemental enhancement information (SEI) messages. The VUI parameters and SEI messages defined
in this document are designed to be conveyed within coded video bitstreams in a manner specified
in a video coding specification or to be conveyed by other means determined by the specifications for
systems that make use of such coded video bitstreams. This document is particularly intended for use
with coded video bitstreams as specified by Rec. ITU-T H.266 | ISO/ IEC 23090-3, although it can also be
used with other types of coded video bitstreams.
VUI parameters and SEI messages can assist in processes related to decoding, display or other purposes.
However, unless otherwise specified in a referencing specification, the interpretation and use of the
VUI parameters and SEI messages specified in this document is not a required functionality of a video
decoder or receiving video system. Although semantics are specified for the VUI parameters and SEI
messages, decoders and receiving video systems can simply ignore the content of the VUI parameters
and SEI messages or can use them in a manner that somewhat differs from what is specified in this
document.