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The person who put the video inside the video "coded" the video and the person who wants to open the video (that is you.) has to "decode" the video.
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Codec, as a word is an abbreviation of Coder / Decoder. The video inside the AVI is typically a compressed video stream that is made with a special tool, called as encoder. AVI is simply a file format, that doesn't itself define how the video inside the file was made and how it should be opened. One of the first terms a digital video freshman gets to know is codec. Each version of Windows ships with a video player software (called Windows Media Player), so that is not a problem.
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Follow the Guide Author on Twitter: video player and codec Generally speaking, playing an AVI requires two things: a video player software and a codec. We try to address this question in this article as well as we can. The same question is being asked by many ways: "I downloaded a movie and it wont play", "AVI wont open!" and "This video doesn't work!" - all of them asking basically the same question. How to play AVI? is probably the most common question a person new to digital video asks.
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