I have an iPod which I normally record my class lectures on. After which I convert the WAV files into AAC format. After I do this, the lectures take up about half as much space. However, I recently upgraded to Quicktime 6.5.1. I've noticed after the upgrade the speed of encoding slowed down (from ~13.0x to about ~10.0x

). But I realized after the encoding was done that the files now only took up about a third of the space

. I was wondering if anyone knew what changes were that were made of Quicktime 6.5.1. Thanks.
Tom