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How to convert a podcast into a normal iTunes entry
Authored by: derrickbass on Dec 06, '06 08:32:10PM

Although, in theory, you could write an MP3 compressor that would adhere to the "mowing the grass" analogy, in practice every time you compress an MP3, even with the exact same algorithm, you lose a little more quality. (If you have some time on your hands (or Doug's scripting ability), compress a file over and over 10 or 20 times with iTunes. You'll hear the difference!)

The trouble is that with mowing the grass, there's only one parameter, length, whereas with MP3 compression (or AAC or any other lossy scheme) you're taking raw audio and doing complicated math on it to produce thousands of numbers, then deciding which of those numbers to throw away and which to keep. If you feed the now modified audio back into the compressor, and do the complicated math again, you get a somewhat different set of thousands of numbers, so you'll probably end up throwing some away that you didn't before, and even the ones you keep will be a little different than they were before.

"Lucky" for me, I have a tin ear, so it takes three or four recompressions before I can hear any difference, even if I'm explicitly listening for it.



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