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Should i start using AAC? Can you notice a better quality?
Bahamut2
post Jan 2 2012, 06:19
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I have read everywhere that it is better than MP3, but will i be able to notice the difference?
I encode all my files to VBR -V0 and i don't know anything about AAC, what would be the equivalent encoding settings for AAC?

Can you people really notice that theyre is a reall difference in quality? I want to test it by myself (encoding always it max quality off course) but first i want to ask here.
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JunkieXL
post Jan 10 2012, 20:22
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I used to use LAME v1 for all of the files I would put on my iPod. When they released the iTunes Plus preset a while back, I started to test that out and found that I couldn't tell the two apart and that I was getting better battery life on my iPod when using AAC files.

LAME v1 is in the 200 to 250 kbs VBR range IIRC and iTunes Plus is in the 256 kbs VBR. (That reminds me that they need to update the bitrate listing in iTunes when looking at a files info. It says 256 on all files no matter how simple or complex the track is.)

I haven't tested at lower settings as I have enough space on my iPod for the larger file sizes.
CK

This post has been edited by JunkieXL: Jan 10 2012, 20:24
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Defsac
post Jan 23 2012, 09:40
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QUOTE (JunkieXL @ Jan 11 2012, 06:22) *
LAME v1 is in the 200 to 250 kbs VBR range IIRC and iTunes Plus is in the 256 kbs VBR. (That reminds me that they need to update the bitrate listing in iTunes when looking at a files info. It says 256 on all files no matter how simple or complex the track is.)


iTunes 'VBR' used to be constrained VBR at least in the older versions, even though the QuickTime engine is capable of encoding true VBR. That is probably why all your files are reading 256kbps. I have not used the iTunes frontend in a while so I'm not sure if this is still the case. XLD for OS X uses the Quicktime encoder and can be set to produce true VBR, I'm not sure whether there are programs for Windows capable of the same thing using Quicktime.

I have heard people speculate Apple chose CVBR for iTunes because they were worried about users being confused about songs resulting in different bit rates even though the quality settings were the same, but I don't know how accurate that is. iTunes (on OS X at least) also used to have issues with calculating bit rates on true VBR AAC files but this may have been fixed since.

Edit: Just did a quick test with the latest iTunes using 256kbps VBR, the resulting file reads as 256kbps in iTunes and 269kbps in OS X Finder. XLD using constrained VBR produced a file that reads as 269kbps in both Finder and iTunes. I suspect iTunes is deliberately displaying the bit rate as 256kbps when the files are produced through iTunes conversion.

Edit 2: Someone posted this in another thread for Windows.

This post has been edited by Defsac: Jan 23 2012, 10:15
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Nessuno
post Jan 23 2012, 18:22
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Anyway, if one uses XLD or any other QuickTime frontend, to produce AAC from his own lossless material, it's better to target for quality (range 0 ~ 127) instead of bitrate. Target quality of 110 roughly corresponds to 255Kbps VBR, but the real average bitrate of a track, which is the value both Finder and iTunes show, actually depends on source complexity.

This post has been edited by Nessuno: Jan 23 2012, 18:42


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Posts in this topic
- Bahamut2   Should i start using AAC? Can you notice a better quality?   Jan 2 2012, 06:19
- - Ron Jones   Can I tell the difference between ~256kbps MP3 and...   Jan 2 2012, 07:04
- - Bahamut2   Im going to make my first ABX test soon, but i wan...   Jan 2 2012, 07:42
- - hlloyge   AAC is, technicaly, a bit more advanced codec than...   Jan 2 2012, 07:52
- - mjb2006   If you do hear a difference in a certain piece of ...   Jan 2 2012, 08:45
- - Bahamut2   I did a quick test with foobar and im surprised i ...   Jan 2 2012, 14:09
|- - markanini   QUOTE (Bahamut2 @ Jan 2 2012, 14:09) Anyw...   Jan 2 2012, 14:21
|- - Nessuno   QUOTE (markanini @ Jan 2 2012, 14:21) QUO...   Jan 10 2012, 20:26
|- - Porcus   QUOTE (Nessuno @ Jan 10 2012, 20:26) I fo...   Jan 12 2012, 12:05
|- - Nessuno   QUOTE (Porcus @ Jan 12 2012, 12:05) QUOTE...   Jan 12 2012, 16:44
||- - Porcus   QUOTE (Nessuno @ Jan 12 2012, 16:44) I wa...   Jan 12 2012, 19:50
|- - polemon   QUOTE (Porcus @ Jan 12 2012, 12:05) QUOTE...   Feb 2 2012, 03:45
- - lvqcl   An example of a problem sample (specific for Nero ...   Jan 2 2012, 14:29
- - apodtele   This is yet another "discussion" initiat...   Jan 2 2012, 15:53
|- - db1989   QUOTE (apodtele @ Jan 2 2012, 14:53) This...   Jan 2 2012, 16:03
- - subinbar   I think for most people to be able to tell the dif...   Jan 10 2012, 15:12
- - Porcus   QUOTE (Bahamut2 @ Jan 2 2012, 06:19) I en...   Jan 10 2012, 17:24
- - JunkieXL   I used to use LAME v1 for all of the files I would...   Jan 10 2012, 20:22
|- - Defsac   QUOTE (JunkieXL @ Jan 11 2012, 06:22) LAM...   Jan 23 2012, 09:40
|- - Nessuno   Anyway, if one uses XLD or any other QuickTime fro...   Jan 23 2012, 18:22
|- - slks   QUOTE (Nessuno @ Jan 23 2012, 11:22) Anyw...   Feb 1 2012, 10:13
|- - C.R.Helmrich   QUOTE (slks @ Feb 1 2012, 11:13) the rece...   Feb 1 2012, 22:43
- - Stillbruch   Hi everyone, This is my first post in this forum,...   Jan 12 2012, 11:00
|- - mjb2006   QUOTE (Stillbruch @ Jan 12 2012, 03:00) A...   Jan 12 2012, 11:47
|- - probedb   QUOTE (Stillbruch @ Jan 12 2012, 10:00) A...   Jan 12 2012, 12:15
|- - Nessuno   QUOTE (probedb @ Jan 12 2012, 12:15) QUOT...   Jan 12 2012, 15:42
- - Stillbruch   I apologise for that claim. Since English is not m...   Jan 12 2012, 15:23
- - HTS   Quick question. Wikipedia says: QUOTE The MPEG-2...   Jan 29 2012, 03:11
|- - IgorC   QUOTE (HTS @ Jan 28 2012, 23:11) Quick qu...   Jan 29 2012, 08:19
- - shadowking   The modern lossy bitrate is far too bloated. Compa...   Jan 29 2012, 04:16
|- - HTS   QUOTE (shadowking @ Jan 28 2012, 22:16) T...   Jan 29 2012, 04:44
|- - aprofromindia   QUOTE (shadowking @ Jan 29 2012, 05:16) T...   Jun 15 2013, 10:29
|- - TomasPin   QUOTE (aprofromindia @ Jun 15 2013, 06:29...   Jun 15 2013, 20:26
- - shadowking   Yes. What I am trying to say is that at 250..300k ...   Jan 29 2012, 06:12
- - zima   QUOTE (Bahamut2 @ Jan 2 2012, 07:42) I re...   Jan 29 2012, 12:59
|- - hlloyge   QUOTE (zima @ Jan 29 2012, 13:59) QUOTE (...   Jan 29 2012, 22:01
- - RobertoDomenico   iTunes Store is 256 AAC with no DRM everywhere no ...   Jan 29 2012, 13:58
- - HTS   Does anyone know what does apple mean by the 0-127...   Jan 29 2012, 19:38
- - lvqcl   Why do you think that it has some hidden meaning?   Jan 29 2012, 21:10
- - adlai   the answer is yes. I moved years ago and I haven...   Jan 29 2012, 23:05
|- - saratoga   QUOTE (adlai @ Jan 29 2012, 17:05) Also, ...   Jan 29 2012, 23:20
|- - adlai   most of it is for stupid stuff like tagging files ...   Jan 29 2012, 23:25
|- - saratoga   So if what you really meant is that Lame is active...   Jan 29 2012, 23:37
|- - Defsac   QUOTE (adlai @ Jan 30 2012, 09:25) most o...   Feb 27 2012, 09:57
|- - nu774   QUOTE (Defsac @ Feb 27 2012, 17:57) QUOTE...   Feb 27 2012, 11:29
|- - Defsac   QUOTE (nu774 @ Feb 27 2012, 21:29) QUOTE ...   Feb 27 2012, 12:37
|- - nu774   QUOTE (Defsac @ Feb 27 2012, 20:37) I ver...   Feb 27 2012, 14:24
|- - TechVsLife   As a practical matter, if you notice artifacts tha...   Mar 24 2012, 18:49
- - IgorC   3.99 fills bitrate gap between the V0 and CBR 320 ...   Jan 30 2012, 00:05
- - simonh   Personally, i'd say stick with what you know a...   Mar 24 2012, 21:35
- - RobertoDomenico   The only reason i would use AAC is if you live in ...   Mar 25 2012, 00:05
- - greynol   I presume you mean the problem when streaming from...   Mar 25 2012, 02:00
- - RobertoDomenico   It's not an actual fault of Lame, the issue is...   Mar 25 2012, 05:41
- - greynol   It doesn't matter if -mj and -q0 are there. Th...   Jun 15 2013, 20:31
|- - TomasPin   QUOTE (greynol @ Jun 15 2013, 16:31) It d...   Jun 15 2013, 20:57
- - db1989   It should be specified that -M is not a valid sw...   Jun 16 2013, 01:08


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