标准编号：ISO/IEC 13818-1:2019
中文名称：信息技术 运动图像及其伴音信息的通用编码 第1部分：系统
英文名称：Information technology — Generic coding of moving pictures and associated audio information — Part 1: Systems
发布日期：2019-06
标准范围
This Recommendation | International Standard specifies the system layer of the coding. It was developed principally to
support the combination of the video and audio coding methods defined in Parts 2 and 3 of ISO/IEC 13818. The system
layer supports six basic functions:
1) the synchronization of multiple compressed streams on decoding;
2) the interleaving of multiple compressed streams into a single stream;
3) the initialization of buffering for decoding start up;
4) continuous buffer management;
5) time identification;
6) multiplexing and signalling of various components in a system stream.
A Rec. ITU-T H.222.0 | ISO/IEC 13818-1 multiplexed bit stream is either a transport stream or a program stream. Both
streams are constructed from PES packets and packets containing other necessary information. Both stream types support
multiplexing of video and audio compressed streams from one program with a common time base. The transport stream
additionally supports the multiplexing of video and audio compressed streams from multiple programs with independent
time bases. For almost error-free environments the program stream is generally more appropriate, supporting software
processing of program information. The transport stream is more suitable for use in environments where errors are likely.
A Rec. ITU-T H.222.0 | ISO/IEC 13818-1 multiplexed bit stream, whether a transport stream or a program stream, is
constructed in two layers: the outermost layer is the system layer, and the innermost is the compression layer. The system
layer provides the functions necessary for using one or more compressed data streams in a system. The video and audio
parts of this Specification define the compression coding layer for audio and video data. Coding of other types of data is
not defined by this Specification, but is supported by the system layer provided that the other types of data adhere to the
constraints defined in 2.7.
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