信息技术 用户界面组件可访问性 第20部分：视听内容开发

[中文适用范围]： 本文件提供了关于开发无障碍视听内容的要求和建议。它针对多种不同的无障碍组件提出了要求和建议，这些组件在ISO 20071系列的其他部分中作了更详细的阐述，以满足不同用户的无障碍需求。文件还提供了与翻译、本地化、时间安排、重要性及其他与创建这些无障碍组件相关的一般性方面的指导。本文件不适用于用于播放视听内容的呈现设备或传输机制。这些设备包括但不限于电视机、计算机、无线设备、投影设备、DVD播放器和家庭影院设备、视频游戏机，或任何其他使用显示器进行视觉呈现并采用其他形式用户界面技术的类似设备。本文件也不适用于对各种视听输出进行转编码的文件和格式。本文件有助于提高无障碍性。本文件并未为特定行业（如电视广播、电影制作）设定具体要求，也无意取代这些行业领域内已有的特定国际标准。 [外文原描述]： This document provides requirements and recommendations on the development of accessible audiovisual content. It provides requirements and recommendations for a variety of different accessibility components, dealt with in further detail in additional parts of the ISO 20071 series, that meet different user accessibility needs. It also provides guidance related to translations, localizations, timing, importance and other general aspects of the creation of these accessibility components. This document does not apply to the presentation devices or transmission mechanisms used to deliver audiovisual content. These devices could include, but are not limited to, televisions, computers, wireless devices, projection equipment, DVD and home cinema equipment, video game consoles, or any similar devices which use displays for visual presentation and other forms of user interface technology. This document does not apply to transcoding files and formats for the various audiovideo outputs. This document helps to improve accessibility. This document does not establish requirements for specific industries (e.g. television broadcasting, motion pictures) nor is it intended to supersede specific international standards within their domain.