信息技术.音频-可视对象的编码.第15部分:高级视频编码文档格式

[中文适用范围]： ISO/IEC 14496 的这一部分指定了 AVC（ISO/IEC 14496-10 | ITU-T H.264 建议书）视频流的存储格式。 AVC 内容的存储使用 ISO 基本媒体文件格式的现有功能，但还定义了扩展以支持 AVC 编解码器的以下功能：切换图片：实现不同编码流之间的切换以及同一码流内图片的替换。 ？子序列和层：提供一组图片的依赖性的结构化，以提供灵活的流结构（例如，在时间可伸缩性和分层方面）。 ？参数集：序列和图像参数集机制将不频繁变化的信息的传输与编码宏块数据的传输解耦。 包含编码宏块数据的每个片参考包含其解码参数的图片参数集。 反过来，图片参数集参考包含序列级解码参数信息的序列参数集。 [外文原描述]： The Advanced Video Coding (AVC) standard, jointly developed by the ITU-T and ISO/IEC SC29/WG11 (MPEG), offers not only increased coding efficiency and enhanced robustness, but also many features for the systems that use it. To enable the best visibility of, and access to, those features, and to enhance the opportunities for the interchange and interoperability of media, ISO/IEC 14496-15:2004 defines a storage format for video streams compressed using AVC. ISO/IEC 14496-15:2004 specifies how Advanced Video Coding (AVC) streams are stored in file formats derived from ISO/IEC 14496-12 & 15444-12 (The ISO Base Media File Format). As a result, it therefore also defines how AVC streams are stored in ISO/IEC 14496-14 (The MP4 File Format). ISO/IEC 14496-15:2004 can be used as a stand-alone specification, but it is normally expected that it will be used in the context of other standards using both the ISO Base Media File Format and AVC. ISO/IEC 14496-15:2004 enables but does not require the use of MPEG-4 systems structures. In ISO/IEC 14496-15:2004 extensions to the ISO Base Media File Format are also defined, to support some of the new features offered by AVC. It is possible that these extensions will in the future be applied to a revision of the ISO Base Media File Format. Simple use of AVC is possible without using any of these structural extensions. ISO/IEC 14496-15:2004 enables AVC video streams to: be used in conjunction with other media streams, such as audio;be formatted for delivery by a streaming server, using hint tracks;inherit all the use cases and features of the ISO Base Media File Format on which MP4 and MJ2 are based.