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10.4: Use Automator to mass-convert iTunes tracks
Authored by: kirkmc on Jul 01, '05 04:36:05AM

You said:

My (limited) understanding of compression algorithms is that they cut out high and low information that my ears (brain?) don't really notice much anyway. If you've cut the tops off the peaks, and the bottoms off the valleys, you can't cut anything more out upon repeated conversion. So IN MY OPINION, I would have no problems with quality in making a conversion like this.

Unfortunately, it's not that simple. It's more like making a photocopy of a photocopy of a photocopy... Each format removes certain types of data, not just highs and lows; if that's all they removed, you wouldn't get compression at a factor of ten (a 128 kbps track is compressed to about 1/10 of its size; the original is 1411 kpbs).

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