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This article is intended for a beginning to intermediate computer user.

When video files are created, they can be compressed to make the file size smaller by using a program (or compressor) that is installed on the developer's computer. When you play the video file, your computer must have a decompressor installed that can read that particular compression format. When you try to play a file that uses a codec that is not installed on your computer, the Windows Media Player tries to download the codec from a Microsoft server. If the codec is available, the Windows Media Player installs it on your computer and then plays the file. However, if the codec is not available on the server (for example, because the codec was not created by Microsoft), the Windows Media Player displays a message that your computer is missing a codec. In some cases, the file that you want to play uses a codec that is not available or compatible with the Windows Media Player. When that happens, you might be unable to use Windows Media Player to play this particular.

To resolve this problem, locate and download the required codec.īefore you start, you must know which version of Windows your computer is running. To verify that you are logged on to Windows with a user account that is a computer administrator, visit the following Microsoft Web site: To determine which version of Windows that you are running. , you must know your Windows Media Player version. If you are running Windows Vista, you are running Windows Media Player 11. You can scroll through the frames on MMD and click one to view that frame of your background AVI fileuseful for if you want to motion trace If it doesn’t load, then it’s possible you may need to download and install the AVC (h264)/x264vfw codec.