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I believe using the concept of mp3 transcoding is not a good example for this topic unless you are specifically talking about going from something like a tape to mp3 or vinyl to mp3. My reasoning behind this is something that you mention in the example regarding headers. There is very little difference between most audio formats but since most people talk about going from cds to mp3, this will be the example I look at. To start with, the information on a cd is already considered digital and therefore transcoding isnt really done other than swapping out a few bits of header information to tell the computer how to handle the file. Secondly, when an mp3 is made all that really happens as far as I know is that algorithms are ran that eliminate sound frequencies that humans cant hear, but do generate more size for a sound file. Just because we cant hear it, doesnt mean it isnt there. Therefore, i dont think that mp3 is a good example of transcoding as the format stays the same really, but the instructions for the format change. This is in my opinion different than what transcoding means which put in very general terms, means translating from one format to another. A couple of examples which I think are similar to this idea.