Hi all,
I've noticed a couple of audible distortions in an AAC track I bought on iTunes. I uploaded a small fragment of the track with distortions here: 53 FRAGMENT Sonata in A Minor, D. 821, 'Arpeggione '_ I. Allegro moderato.m4a (http://turbobit.net/jh3dcnod6pam.html). I wonder if these are compression artifacts or they were caused by something else?
I appreciate your help with this.
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Sorry about that."
Sorry about that. I uploaded the same fragment also to Mediafire. I think it should work in the US too:
http://www.mediafire.com/?l8lip63v28y7r1c (http://www.mediafire.com/?l8lip63v28y7r1c)
It seems an audio problem but I am not expert enough of that particular track and I can't for sure say it's not a key vibration sound.
Of course the only way to be sure would be a comparison with the lossless version, but to me it doesn't seem a compression artefact. It seems more an imperfection in the recording, or some kind of "mechanical" noise from the bow strokes, maybe the microphones were placed a little too near.
In my experience, trying to spot artefacts to ABX on AAC @256Kbps has instead leaded me to find a lot of similar imperfections in the original recordings!
I see. Thanks for your replies!
To me it simply sounds like a string loosened on the Cello or whatever the bigger stringed instrument is.
The original one has the same sound as well, as I supposed it's just a key vibration sound.
http://dropcanvas.com/pnvin (http://dropcanvas.com/pnvin)
EAC Log:
Exact Audio Copy V0.99 prebeta 5 from 4. May 2009
EAC extraction logfile from 6. January 2011, 1:50
Andras Schiff, Yuuko Shiokawa, Miklos Perenyi / Andras Schiff - Concertos & Chamber Music - CD7 - Schubert
Used drive : HL-DT-STDVDRAM GSA-4083N Adapter: 1 ID: 0
Read mode : Secure
Utilize accurate stream : Yes
Defeat audio cache : Yes
Make use of C2 pointers : No
Read offset correction : 667
Overread into Lead-In and Lead-Out : No
Fill up missing offset samples with silence : Yes
Delete leading and trailing silent blocks : No
Null samples used in CRC calculations : No
Used interface : Native Win32 interface for Win NT & 2000
Used output format : User Defined Encoder
Selected bitrate : 768 kBit/s
Quality : High
Add ID3 tag : No
Command line compressor : C:\Program Files\Exact Audio Copy\FLAC\FLAC.EXE
Additional command line options : -6 -V -T "ARTIST=%a" -T "TITLE=%t" -T "ALBUM=%g" -T "DATE=%y" -T "TRACKNUMBER=%n" -T "GENRE=%m" -T "COMMENT=%e" %s -o %d
TOC of the extracted CD
Track | Start | Length | Start sector | End sector
---------------------------------------------------------
1 | 0:00.00 | 11:19.55 | 0 | 50979
2 | 11:19.55 | 4:18.52 | 50980 | 70381
3 | 15:38.32 | 9:15.08 | 70382 | 112014
4 | 24:53.40 | 15:07.15 | 112015 | 180054
5 | 40:00.55 | 9:56.65 | 180055 | 224819
6 | 49:57.45 | 6:40.05 | 224820 | 254824
7 | 56:37.50 | 9:04.25 | 254825 | 295649
Range status and errors
Selected range
Filename F:\Music\Schiff - Concertos & Chamber Music\Schiff - Concertos & Chamber Music - CD7.wav
Peak level 98.8 %
Range quality 100.0 %
Copy CRC CC05314A
Copy OK
No errors occurred
End of status report
The original one has the same sound as well, as I supposed it's just a key vibration sound.
Thank you very much! This is very helpful. I was considering contacting iTunes and asking them to fix the issue. Now I see that it's not their fault.
To me it simply sounds like a string loosened on the Cello or whatever the bigger stringed instrument is.
Agreed. It's Miklos Perenyi playing the cello. A great artist.