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iTunes Encodes vs. Amazon (Spectrograms), Spectograms.
Engelsstaub
post May 14 2012, 02:39
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A spectral comparison of an iTunes file and its counterpart from Amazon:

Fear Factory - Recharger (Single) iTunes/m4a




Fear Factory - Recharger (Single) Amazon/mp3



I understand a spectrogram tells us pretty close to nothing about how a music file actually sounds to the listener. I still challenge anyone to find results that are reversed. I never have. (I get "credits," like many others, for Amazon mp3s. I download the iTunes versions as an iTunes Match subscriber.)

At this bitrate I personally doubt listeners will discern between the two. Does this discount the validity of saying one encode is of a "higher quality" or that it is "better" in that it retains more of the source? These graphs can still tell us "what is missing" and what the respective encoders saw fit to lose in lossy encoding.

Thoughts...

This post has been edited by Engelsstaub: May 14 2012, 02:44


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saratoga
post May 14 2012, 04:12
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QUOTE (Engelsstaub @ May 13 2012, 21:39) *
Does this discount the validity of saying one encode is of a "higher quality" or that it is "better" in that it retains more of the source?


Yes, its still a meaningless test.

QUOTE (Engelsstaub @ May 13 2012, 21:39) *
These graphs can still tell us "what is missing"


No. All they show you is what the lowpass filter used to preprocess the PCM was set to.

QUOTE (Engelsstaub @ May 13 2012, 21:39) *
Thoughts...


Don't we have a FAQ entry for this kind of thing? I feel like we must its asked constantly.

Edit: Yes, took me a minute to find it though. See the entry here and the links:

http://wiki.hydrogenaudio.org/index.php?ti...dio_Compression

This post has been edited by saratoga: May 14 2012, 04:18
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Posts in this topic
- Engelsstaub   iTunes Encodes vs. Amazon (Spectrograms)   May 14 2012, 02:39
- - Gentoo64   I think anyone would prefer a higher bitrate purel...   May 14 2012, 03:01
|- - greynol   QUOTE (Gentoo64 @ May 13 2012, 19:01) But...   May 14 2012, 04:48
- - onkl   First of all, if you can't hear tones above 20...   May 14 2012, 04:10
|- - Engelsstaub   QUOTE (onkl @ May 13 2012, 22:10) First o...   May 14 2012, 05:06
|- - onkl   QUOTE (Engelsstaub @ May 14 2012, 06:06) ...   May 14 2012, 06:40
- - saratoga   QUOTE (Engelsstaub @ May 13 2012, 21:39) ...   May 14 2012, 04:12
|- - Engelsstaub   QUOTE (saratoga @ May 13 2012, 22:12) QUO...   May 14 2012, 05:01
|- - saratoga   QUOTE (Engelsstaub @ May 14 2012, 00:01) ...   May 14 2012, 05:21
- - eahm   QUOTE (onkl @ May 13 2012, 20:10) First o...   May 14 2012, 05:19
- - Engelsstaub   Okay, Saratoga. I said: "These graphs can sti...   May 14 2012, 05:43
|- - saratoga   QUOTE (Engelsstaub @ May 14 2012, 00:43) ...   May 14 2012, 06:00
|- - Canar   QUOTE (Engelsstaub @ May 13 2012, 21:43) ...   May 14 2012, 06:30
- - saratoga   Someone should add a feature to LAME that subtract...   May 14 2012, 07:29
|- - Engelsstaub   QUOTE (saratoga @ May 14 2012, 01:29) Som...   May 14 2012, 07:56
|- - saratoga   QUOTE (Engelsstaub @ May 14 2012, 02:56) ...   May 14 2012, 08:09
- - Engelsstaub   Canar: I never claimed anything regarding my perso...   May 14 2012, 07:51
|- - db1989   QUOTE (Engelsstaub @ May 14 2012, 07:51) ...   May 14 2012, 08:49
|- - 2Bdecided   QUOTE (Engelsstaub @ May 14 2012, 07:51) ...   May 14 2012, 11:58
|- - dhromed   QUOTE (Engelsstaub @ May 14 2012, 08:51) ...   May 14 2012, 12:22
- - Porcus   Is this low-pass thing an AAC vs MP3 difference, r...   May 14 2012, 09:17
- - LithosZA   Encoding stuff above 20Khz is dumb especially for ...   May 14 2012, 09:41
|- - db1989   QUOTE (LithosZA @ May 14 2012, 09:41) For...   May 14 2012, 09:50
|- - onkl   QUOTE (LithosZA @ May 14 2012, 10:41) The...   May 14 2012, 10:11
|- - Porcus   QUOTE (LithosZA @ May 14 2012, 10:41) Enc...   May 14 2012, 11:58
|- - mjb2006   QUOTE (Porcus @ May 14 2012, 04:58) Just ...   May 15 2012, 01:16
- - pdq   All right, let me try my hand at an analogy. Two ...   May 14 2012, 11:54
- - Engelsstaub   I really wasn't clear as to how these spectrog...   May 14 2012, 15:34
|- - dhromed   QUOTE (Engelsstaub @ May 14 2012, 16:34) ...   May 14 2012, 21:43
|- - Canar   QUOTE (Engelsstaub @ May 14 2012, 07:34) ...   May 14 2012, 22:18
- - lvqcl   QUOTE (menno @ Mar 12 2007, 16:13) Given ...   May 15 2012, 19:04


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