标准摘要
[中文适用范围]： 本文件描述了一些形式的时间文本文档和字幕流在基于ISO/IEC 14496-12（ISO基础媒体文件格式）的文件中的载体。这些文档的形式并不排除其他时间文本或字幕定义方式；例如，3GPP时间文本（3GPP TS 26.245），或其他类型媒体流中嵌入的字幕信息（参见附录A）。 [外文原描述]： This document describes the carriage of some forms of timed text and subtitle streams in files based on ISO/IEC 14496-12 (the ISO base media file format). The documentation of these forms does not preclude other definition of carriage of timed text or subtitles; see, for example, 3GPP Timed Text (3GPP TS 26.245), or the carriage of captioning information embedded in a media stream of another type (see Annex A).
英文名称Information technology - Coding of audio-visual objects - Part 30: Timed text and other visual overlays in ISO base media file format