The iTunes AAC does not cap the volume. Sorry but that is incorrect. ... Either way, it is the iPod itself that implements the volume cap; not iTunes or iTunes AAC.
iTunes 9 AAC is awful. No matter how loud the song is on your computer, or how loud you raise the volume with mp3gain, the volume will be capped when you play it on your iPod. I had to redo all my AAC's with Nero. What a complete waste of time.Stay away.
After encoding the same uncompressed file to Nero AAC, Lame MP3, and iTunes AAC, the iTunes AAC sounds about 6 decibels lower than the others (including the uncompressed one).
I can only conclude you have not tested this properly.
EDIT: On top of this, I have just done it again to make sure, this time with Weezer's song Buddy Holly. I tested the WAV, FAAC, Nero, LAME, and iTunes 9, and all were the same volume on my iPod except the iTunes 9 AAC which was substantially lower.
So tell us, how did you 'measure' the output from your iPod? That's assuming I believe you (I don't).
The issue with Apple has been resolved. The volumes are now consistent with the volume outputs of other encoders.
Quote from: brainstewx on 14 January, 2010, 03:02:16 AMThe issue with Apple has been resolved. The volumes are now consistent with the volume outputs of other encoders.Could you please post the solution?I have also observed the same.I have encoded a file with iTunes and with Nero; decode both to wav and compare the two wav files. The iTune decoded wav has a lower max volume than the Nero decoded wav. This is clearly seen with both wav files loaded in a sound editor.
have you tried to demux/remux m4a file, and change volume with aacgain?
Have you tried ReplayGain scanning the files with foobar2000, or editing the RG values manually, then applying them to SoundCheck tags?