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Video can be stored in many different formats.
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The AVI (Audio Video Interleave) format was developed by Microsoft.
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The AVI format is supported by all computers running Windows, and by all the most popular web browsers. It is a very common format on the Internet, but not always possible to play on non-Windows computers.
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Videos stored in the AVI format have the extension .avi.
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The Windows Media format is developed by Microsoft.
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Windows Media is a common format on the Internet, but Windows Media movies cannot be played on non-Windows computer without an extra (free) component installed. Some later Windows Media movies cannot play at all on non-Windows computers because no player is available.
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Videos stored in the Windows Media format have the extension .wmv.
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The MPEG (Moving Pictures Expert Group) format is the most popular format on the Internet. It is cross-platform, and supported by all the most popular web browsers.
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Videos stored in the MPEG format have the extension .mpg or .mpeg.
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The QuickTime format is developed by Apple.
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QuickTime is a common format on the Internet, but QuickTime movies cannot be played on a Windows computer without an extra (free) component installed.
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Videos stored in the QuickTime format have the extension .mov.
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The RealVideo format was developed for the Internet by Real Media.
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The format allows streaming of video (on-line video, Internet TV) with low bandwidths. Because of the low bandwidth priority, quality is often reduced.
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Videos stored in the RealVideo format have the extension .rm or .ram.
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The Shockwave format was developed by Macromedia.
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The Shockwave format requires an extra component to play. This component comes preinstalled with the latest versions of Netscape and Internet Explorer.
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Videos stored in the Shockwave format have the extension .swf.
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