mp4 files support all kinds of multimedia content (multiple audio streams, video streams, subtitle streams, pictures) and advanced content (called "Rich Media" or "BIFS") like 2D and 3D graphics, user interactivity, DVD-like menus. These mp4 files are in a container format defined in the Systems Part of the MPEG-4 standard (ISO 14496-1). It typically uses the mp4 file extension for its files. The MPEG-4 file format, as defined by the MPEG-4 specification, contains MPEG-4 encoded video and Advanced Audio Coding (AAC)-encoded audio content. The mp4 file extension is used mainly for the MPEG-4 multimedia file format.
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