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It is necessary to convert files so as to reduce the file size. it also is used to convert your specific video to your desired file format which is supported by your popular media players. Like for example, Mp3 players, DVD players and the likes. Currently there are a number of available video file formats all over the world. The most popular being AVI or Audio/Video Interleaved, MPEG or Movie Picture Experts Group, Real Media, WMV or Windows Media Video, ASF and so many others. Every file format available contains data which has been coded using their different methods of encoding. But most of them use CODECS. The most popular codecs used in file format conversion is the DivX codec. Using Mp3 for its audio stream. Most of the time, to further reduce the file size of a media file, it does not need to change the format. It just needs to adjust bitrate. or the frame rate.