本文档定义了用于编码系统、资产管理和分发的内容规范。它没有定义分发方法，也没有定义内容在分发和播放期间可能遇到的有线电视系统基础设施的所有方面。 文件的组织 本文件包含三个主要部分。第6节介绍一般编码，第7节给出了特定于标准清晰度编码的附加约束，第8节介绍了高清晰度编码，第9节介绍了高级视频编码。

This document defines the content specifications for use with encoding systems, asset management, and distribution. It does not define a distribution method nor define all aspects of the cable system infrastructure that content may encounter during distribution and playback. Organization of Document This document contains three major sections. Section 6 covers general encoding, Section 7 gives additional constraints specific to standard definition encoding, Section 8 covers high definition encoding, and Section 9 covers advanced video encoding.