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Digital container format
A container or wrapper format is a metafile format whose specification describes how different elements of data and metadata coexist in a computer file.
Among the earliest cross-platform container formats were Distinguished Encoding Rules and the 1985 Interchange File Format. Containers are frequently used in multimedia applications.
==Properties==
Since the container does not describe how data or metadata is encoded, a program able to identify and open a container file might not be able to decode the contained data. This may be caused by the program lacking the required decoding algorithm.
By definition, a container format could wrap any kind of data. Though there are some examples of such file formats (e.g. Microsoft Windows's DLL files), most container formats are specialized for specific data requirements. For example, a popular family of containers is found for use with multimedia file formats. Since audio and video streams can be coded and decoded with many different algorithms, a container format may be used to provide a single file format to the user.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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