ISO 26429-3:2008规定了使用材料交换格式（MXF）文件格式分发数字电影内容的声音和图片轨道文件格式的共同特征。它定义了用于在网络或存储介质的信号接口处交换的数据结构，但没有定义兼容设备的内部存储格式或特定本质编码的映射。 ISO 26429-3:2008是数字电影应用的应用规范。它基于SMPTE 390M OP-ATOM标准，但进一步受到限制，以满足向展览场地分发数字电影内容的需要。

ISO 26429-3:2008 specifies the common features of the format of sound and picture tracks files for distribution of digital cinema content using the material exchange format (MXF) file format. It defines data structures for interchange at the signal interfaces of networks or storage media, but does not define internal storage formats for compliant devices or mappings for particular essence encodings. ISO 26429-3:2008 is an application specification for digital cinema applications. It is based on the SMPTE 390M OP-ATOM standard, but is further constrained to address the needs of distribution of digital cinema content to exhibition sites.