Whats the difference between an mpeg, mpg, mp3 and mp4 extensions?
If you want it in short, mpg and mpeg are the same they use the mpeg 2 format for encoding. They are also video formats used in dvds mpeg 3 [mp3] uses is an audio format. It compresses files well because it removes audio at frequencies the human ear cannot hear. mpeg 4 is divided into mpeg4a and mpeg4v which is audio video. If you want a more high-fi answer http://en.wikipedia.org/wiki/MPEG-2 http://en.wikipedia.
