Convert iTunes Library to AAC

I agree with ksv (well, we agree with each other) ! You're killing your library !

Just think of it: you're re-ecoding damaged files (in terms of sound quality) into another destructive format !

This is just like if you were saving a JPEG file to a GIF file ! Or if you were recording a video tape... on another video tape.

The final result will be a few more Megs of space, but for what price ? AAC and MP3 tend to do the same thing to tracks: they kill some highs and some lows and compress the whole freqs to make sit stick to the smallest file possible.

If you accomplish the source-->--mp3-->--aac process, you are killing killed freqs (ouch! kill*kill=kill^2), which means Roni Size will sound like Kraftwerk and 4 Non Blondes like Nina Hagen.

:( :( :(
 
Originally posted by blastic
i have just converted a few 192's to 160 aac and the difference is noticable, but sooo slight it will not matter to me, good luck everyone with this new format!
Click to expand...

encode CD to 160AAC... you won't see a diffrence... heck you probably won't see a difrence from MP3 192kb to AAC at 96kb
download here: 96kbps aac
mp3 192kbps
you need to put a 3 after .mp to play
 
Originally posted by ksv
Arrrgh, pleease! Stop, you're torturing me! ;)
Click to expand...
I know! Maybe it would be a good idea to put something in the faqs section on AAC, there seems to be quite a bit of confusion about it, this is about the third thread I've seen where people are getting the wrong end of the stock when it comes to encoding.
 
Originally posted by toast
If you accomplish the source-->--mp3-->--aac process, you are killing killed freqs (ouch! kill*kill=kill^2), which means Roni Size will sound like Kraftwerk
Click to expand...
lol :)
 
Originally posted by cq107
encode CD to 160AAC... you won't see a diffrence... heck you probably won't see a difrence from MP3 192kb to AAC at 96kb
download here: 96kbps aac
mp3 192kbps
you need to put a 3 after .mp to play
Click to expand...

I can see a lot of difference :D

MP3:

Code: 
00 00 00 03 4C 88 3F 85 3C A0 02 6C 91 37 F0 A7
94 00 56 1E 41 0F 98 D3 80 02 BA 48 21 F3 1A 70
00 0D 58 6A C3 56 1A B1 73 2E 67 5B 3E EF 78 F7
DE 29 4A 1E 84 21 09 90 84 21 09 D8 9F FF FA 10
84 6F FA 9C 8D FF FF FF FF FA 9C E7 7F FF FF FF
FF FF CF FF FF FF FF 90 9E BF FF 42 07 03 81 C0
E0 70 5D D0 40 38 02 00 00 00 10 0E 2E E4 10 0E
07 03 84 7F 38 7C 3E 1F 0E 0A 13 9C E7 0E 10 95
38 98 7C 3E 1C 0E 18 1E 1F 98 F1 37 13 71 37 13
72 16 5C D4 71 F7 9B DE F7 FF FD 08 42 10 8D 90
84 6C E4 21 09 FF FE 42 10 84 23 68 42 37 FC E7
39 09 FF F9 08 73 9D FF A1 08 4F FF F9 CF FF FF
FF FF FB FF FF FF 53 9C 84 21 09 EF FF 42 10 8D
E7 39 CE 73 9C E2 84 65 13 0F 87 C3 E2 ED FA B9
08 42 10 84 9C 38 1C 24 E2 61 F0 F8 7C 00 02 07
05 09 F0 07 80 00 08 00 00 40 C0 10 10 08 00 81
04 10 03 90 15 C0 9C 82 72 12 20 52 9A 82 CF A7
BC DD 5A 2B 5E 72 DD 11 CC 76 9F 38 E3 AE 86 F4
4C D6 38 C4 4A 7D 28 76 59 CE 74 3F EA D7 9C D5
35 0C 66 4D 3F E7 7E 76 F5 64 7D 74 B2 D7 D1 D3
D5 D9 8D 66 31 9C EE F5 46 7A 55 DD 8F BA BD 2D
5B 36 7A B2 51 92 FC E3 D8 F6 2E 40 88 8A 60 D4
74 39 07 43 06 84 C2 38 88 0F 45 23 61 60 A8 B1
41 20 C2 87 94 96 24 27 71 59 84 C7 82 53 42 C2
40 D8 1F 9A 2A 0A 17 07 A6 88 E3 71 B1 E8 71 CA
82 61 58 D8 42 44 91 41 58 92 04 05 82 81 A0 F1
A4 C6 E6 0E 01 A0 F8 1A 00 02 80 80 20 20 10 21
04 10 00 05 B0 3B 02 4A 08 48 48 81 DC CA 6A 49
AD 15 59 4C 9A 96 4E CA 88 D7 32 F4 39 0E 51 C6
B9 87 23 6A 76 E8 8F FD 1A 64 D5 54 BD 77 BD 53
30 C3 4F B3 CE 3A D7 5E D5 3B AD 4C 30 D3 4C 3D
55 13 DA CA FB 7D 9D FB 6A EB 7F 6D F9 E7 D9 11

AAC:

Code: 
38 21 4D E9 2A 87 D7 AB 49 BE 6A 59 BE A9 B9 E4
51 55 5C E5 7E 00 AA CD ED F7 28 2B 37 B2 1D 76
BA F8 20 4F C5 5C D0 91 E5 11 B3 CD 89 D3 AC 4C
F0 48 01 04 88 2B A4 DF 7F 20 A5 DE 78 E3 27 BB
F0 5D 23 24 74 EF DF 72 11 3F 32 94 A7 F7 26 A1
96 08 B4 E4 96 05 A5 DC 25 E2 3A 06 C5 D9 E5 B4
58 59 8C FB 42 E0 78 59 0A C4 46 01 0F 01 F0 BD
C1 CF 7E AC 86 14 82 83 13 73 8C EB 41 84 F6 4C
20 47 1E 70 60 41 D6 15 67 E5 D7 91 88 77 4A 07
41 DD 0C A1 13 48 78 88 BD AF C7 F5 E0 7C A7 C9
80 47 C6 FE 06 A1 B8 14 73 54 40 BF 83 9A 65 13
66 02 2A 87 3E 96 53 4D B8 2E 96 A3 2C 62 D4 81
D8 3D 6E DD B8 64 7E F9 89 FC CC EC 3D 6B 8D C2
BA CB EA 9A 25 29 B1 F9 81 29 30 4C 88 49 72 9C
D1 5B 39 97 81 80 00 00 13 CD F8 07 02 E5 64 48
6A 66 83 04 5F FA 44 10 1E 82 C2 BF 51 26 8F 0C
E6 A8 17 5F C5 F5 AF B3 78 37 06 C4 4D 7C F6 BC
B0 29 ED B5 B4 DB F6 3B 6C 66 D0 AE 35 E6 11 64
79 C9 6C B2 E6 ED 1C BB 5F F9 BF E4 01 54 3E BE
6A 49 BE A9 C9 BE A9 C9 E4 51 55 5C E5 7E 00 AA
CD ED F7 28 2B 37 B2 1D 66 3A BF 0A CE 0D 60 0B
46 05 D2 5A BB 36 F5 AE 76 47 DA F7 5E 17 89 FF
5E 04 DD BE 2F D4 AF 58 D7 CC 91 40 E6 BE 2B 3D
E2 14 92 C0 1C 63 EA AE 8A 72 66 86 45 33 9E FE
D1 A5 FD 0E 58 23 99 37 AA 42 D8 34 F0 1C 83 29
F6 5D 49 41 80 12 28 0D E7 F8 F7 D1 3E 5E 50 40
E3 68 01 80 AA B6 97 16 8D 13 C0 00 12 C7 19 EE
7E F9 91 AA 6E 60 37 4B E0 C0 FA 9F FD A0 28 A1
F9 4E 92 8C BB F7 AA 6F D5 A9 34 A4 43 97 B0 DA
1C D0 1F BD EB 6D 4D B1 5B FC 7B D8 4C 7E 8D 2D
06 41 F3 6C B7 9C F4 4D FA 9F 77 13 42 64 66 33
69 E7 D2 CB 8C A3 C7 BD 3D E8 BB 97 97 FE 80 04

I can even hear it :p

But sure, if you're only listening to the music on small speakers or headphones you won't hear the difference :)

Did some sound quality testing today, and both 128 and 192 kbps AAC sounded a lot better than 192 kbps MP3. Couldn't notice any difference between 192 kbps and 128 kbit AAC, but all in all they seemed to conserve the original frequency spectrum better than MP3, especially bass and treble.
 
The code is naturally different, ksv, for the compression isn't the same. If this code is what you get when extracting the tracks to AIFF, then forget what I said, but otherwise, different coding is obvious here.

128k AAC seems perfect. It's iTunes 4 default option and looks like a good choice.

Can PCs read AAC ?
 
Originally posted by toast
Can PCs read AAC ?
Click to expand...
Presumably, if they have the codec for winamp or whatever. AAC is just a kind of mp4 compression, its just that the first major adopter seems to be Apple.
 
Don't convert MP3's to AAC and don't rip songs from a CD burned with MP3's to AAC. Either way, you're k^2'ing your songs. Many of my MP3's sound terrible on my iMac in the bass range, and I think it's from being compressed as an MP3.

MP3 : JPEG :: MP4/AAC : PNG

(Wow, way too many caps in that SAT-style analogy!)
 
I agree, you're k^2'ing your files, but it's far worse than arden's analogy. It's not JPEG to PNG, it's JPEG to JPEG. Try it and enjoy the filesize, but then look at the picture.
 
This just kills me ... I have a HUGE Mp3 library (Over 25 Gigs) and about 3 days ago I started copying the approx 200+ CD I have left to Mp3 to complete my migration to the digital music world. My thinking was that I would eventually convert my entire music library to AAC, so i didn't worry about it for now. I am about 150 CD's into the conversion and I now realize I should have been ripping these to AAC format all along. Waaaaaaa!
 
I don't think i will convert all mine over, too many, just not worth all the time. I have yet to rip one CD to AAC, my 50 Cent is still in my car, I said i would rip it when iTunes 4 came out, and it's still there in the CD player. I just don't see it happening.
 
Converted my first CD, and considering all my MP3s are at 192kbs, I don't hear much of a difference, but I do see the huge file size difference. All new Cds will be AAC, the old will stay MP3s, not worth the time.
 
I have started my CD ripping project over, this time to AAC, and I was really surprised at how easy it was. iTunes recognizes when a CD has already been imported and asks if you want to replace the current library tracks with the newly imported ones, keeping all tag information in tact. Very nice feature.

(BTW Urbansory, I too have a shitty Que! USB-CD Burner that I can't use ... :-()
 
I didn't get that feature when i did that one CD, does the music have to be in a certain location for that to work? I had to reconnect each track after removing and deleteing the old mp3s.

Yea, i hate this damn que drive, I have to boot into 9 to burn CDs.
 
I have found a couple of albums that didn't replace. Some I had changed the id3 tag info for the album (i.e., deleted the word import) but could not figure out why a few didn't. Most of them are sucessfully replacing though, making it a hell of alot easier.

It's really strange to add CD's and see your over file size shrink.
 
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