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Video codecs are used in DVD and video CD players and recorders, video broadcast systems, personal computers, and a variety of other applications. In particular, they are widely used in applications that record or transmit video, which may not be feasible with the high data volumes and bandwidths of uncompressed video.
In your specific case it could be you do not have the proper codecs to play that .avi movie, download and install K-Lite Codec Pack Full from http://www.free-codecs.com/download/K_li... If this codec pack and/or the other answer about using VLC media player do not solve the problem then your file might be corrupted.ake sure your file is fully downloaded all 100%. Make sure you have the required codecs, meaning if the movie is .AVI make sure you have a media player that is capable of playing .AVI.