MP4 File Format
   
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    GraphicsAcademy.com  >  File Formats  >  MPEG-4 Part14

       

     

    MP4 File Format

    Short Name MP4
    Long Name MPEG-4 Part14
    Typical File Extensions .mp4 .m4a .m4p .m4b .m4r .m4v
    Contains Video/Audio
    MPEG-4 Part 14, usually simply known as MP4, is a media file format for storing digital video and/or audio, and can also accommodate subtitles and still pictures.

    The official file extension to be used for all MP4 files, is .mp4, however a number of other file extensions have entered into common use:-
    • The copy-protected audio tracks that were sold through the iTunes Store, were named with the extension .m4p.

    • The non-copy-protected iTunes Plus audio tracks currently sold through the iTunes Store, use names with the extension .m4a.

    • Audio books and podcasts (which usually contain chapter markers, and other options such as images and hyperlinks) usually have file names with the extension .m4b, although sometimes .m4a is also used.

    • Apple's iPhone, although it uses standard MPEG-4 audio for its ringtones, requires file names with the extension .m4r.

    • The .m4v extension is sometiems used for videos in the MP4 format.
    It should also be noted:
    1. The MP4 file format is closely related to the 3GPP and 3GPP2 file formats used by mobile phones, and although 3GPP and 3GPP2 files usually use the extensions .3gp and .3g2, occasionally you may encounter a 3GPP or 3GPP2 with a .mp4 extension.

    2. Some hardware devices, advertised as "MP4 players", are in fact MP3 players with support for the AMV video format (or other video file formats), but do not in fact support MPEG-4 Part 14.

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