信息技术.音视对象编码.第12部分:ISO基介质文档格式

[中文适用范围]： 该国际标准指定了 ISO 基本媒体文件格式，这是一种通用格式，构成了许多其他更具体的文件格式的基础。 此格式包含媒体数据定时序列（例如音频/视频演示）的定时、结构和媒体信息。 ISO/IEC 14496的这一部分适用于MPEG-4，但其技术内容与适用于JPEG 2000的ISO/IEC 15444-12相同。 [外文原描述]： ISO/IEC 14496-12:2005 specifies the structure and uses of the ISO base media file format. The identical text is published as ISO/IEC 15444-12:2005. This file format is used to contain time-based media such as video and audio. The storage of particular coding schemes is defined in specifications that derive from and reference ISO/IEC 14496-12:2005 and ISO/IEC 15444-12:2005, such as the MPEG-4 file format specified in ISO/IEC 14496-14, or the Motion JPEG file format specified in ISO/IEC 15444-3. This file format is designed to contain timed media information for a presentation in a flexible, extensible format that facilitates interchange, management, editing and presentation of the media. This presentation may be "local" to the system containing the presentation, or may be via a network or other stream delivery mechanism. The file format is designed to be independent of any particular network protocol while enabling efficient support for them in general. The file structure is object-oriented; a file can be decomposed into constituent objects very simply, and the structure of the objects inferred directly from their type. This technically identical text is published as ISO/IEC 14496-12:2005 for MPEG-4, and as ISO/IEC 15444-12:2005 for JPEG 2000, and reference to this specification should be made accordingly. The recommendation is to reference one, for example ISO/IEC 14496-12:2005, and append to the reference a parenthetical comment identifying the other, for example "(technically identical to ISO/IEC 15444-12:2005)". This version adds various new tools, including those for content protection, better support of metadata, and better support for advanced coding.