I've performed some listening tests between MPC 1.14, 1.15r, 1.15s and the new GCC compile of 1.15s.
I used some killer samples :
- amnesia (normalized to -1db to avoid clipping).
- fsol.
- spahm (cut to avoid clipping, that occurs at the end).
...some difficult samples :
...an MP3 killer sample :
...and an audiophile sample :
I also checked the filesize bug discussed here : http://www.hydrogenaudio.org/forums/index....indpost&p=97966
All encoding were done with the option --xlevel alone, thus at quality 5 (defaulted). They were decoded by Foobar2000 0.8.2, no DSP.
I used ABC/HR. For each sample, I first ran ABX tests. Then ABCHR ratings. With easy samples, I chose to perform 16 ABX sessions. With difficult ones only 8. The decision was made prior each test. I never changed my mind during a test.
Results :
With Amnesia, 1.15r and 1.15s sound bad, 1.14 and 1.15s GCC sound worse.
I ABXed 1.15s versus 1.15s GCC with a score of 8/8.
With Astral, I could ABX 1.15s gcc versus the original. It was the first sample. I don't know if I couldn't ABX the other ones because they sound better or because of listening fatigue.
Badvilbel is transparent for me.
Fsol is horrible whatever version is used.
Rebecca sounds transparent for me.
Spahm sounds worse with 1.15s GCC. I ABXed it versus all other versions.
It seemed to me that Transwave also sounds worse with 1.15s GCC, however I could not ABX it vs 1.15s. 1.15s GCC was the easiest to ABX, though.
The filesize bug is only present in 1.15r. It was solved in 1.15s.
Conclusion :
1.15s GCC is clearly worse than the classical 1.15s on two samples (Amnesia and Spahm). It may be worse with two other samples (Transwave, Astral). It made no difference with the three other samples.
Full results :
ABC/HR Version 0.9b, 30 August 2002
Testname: MPC115
1R = G:\Hunting bzz\mpc115s\115r\001 Amnesianorm.wav
2L = G:\Hunting bzz\mpc115s\115s\001 Amnesianorm.wav
3L = G:\Hunting bzz\mpc115s\115sGCC\001 Amnesianorm.wav
4L = G:\Hunting bzz\mpc115s\114\001 Amnesianorm.wav
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General Comments:
In the ABX module, samples 1 and 2 can be immediately recognized because of a hissing. Sample 3 and 4 have more ringing.
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1R File: G:\Hunting bzz\mpc115s\115r\001 Amnesianorm.wav
1R Rating: 4.0
1R Comment: Hissing at the beginning
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2L File: G:\Hunting bzz\mpc115s\115s\001 Amnesianorm.wav
2L Rating: 3.0
2L Comment: Hissing at the beginning
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3L File: G:\Hunting bzz\mpc115s\115sGCC\001 Amnesianorm.wav
3L Rating: 2.0
3L Comment: Hissing at the beginning, ringing
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4L File: G:\Hunting bzz\mpc115s\114\001 Amnesianorm.wav
4L Rating: 2.0
4L Comment: Hissing at the beginning, ringing
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ABX Results:
Original vs G:\Hunting bzz\mpc115s\115r\001 Amnesianorm.wav
17 out of 17, pval < 0.001
Original vs G:\Hunting bzz\mpc115s\115s\001 Amnesianorm.wav
16 out of 16, pval < 0.001
Original vs G:\Hunting bzz\mpc115s\115sGCC\001 Amnesianorm.wav
16 out of 16, pval < 0.001
Original vs G:\Hunting bzz\mpc115s\114\001 Amnesianorm.wav
16 out of 16, pval < 0.001
G:\Hunting bzz\mpc115s\115s\001 Amnesianorm.wav vs G:\Hunting bzz\mpc115s\115sGCC\001 Amnesianorm.wav
8 out of 8, pval = 0.004
ABC/HR Version 0.9b, 30 August 2002
Testname: MPC115
1L = G:\Hunting bzz\mpc115s\115sGCC\002 astral.wav
2R = G:\Hunting bzz\mpc115s\115r\002 astral.wav
3L = G:\Hunting bzz\mpc115s\114\001 astral.wav
4R = G:\Hunting bzz\mpc115s\115s\002 astral.wav
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General Comments:
In the ABX module, the 7 first sessions of sample 1 were done with headphones, spotting sweeping in the third quarter. The last was done with speakers, spotting pumping in the noise.
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2R File: G:\Hunting bzz\mpc115s\115r\002 astral.wav
2R Rating: 4.0
2R Comment: Sweeping in the 3rd quarter part
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3L File: G:\Hunting bzz\mpc115s\114\001 astral.wav
3L Rating: 4.0
3L Comment: Sweeping in the 3th quarter part.
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4R File: G:\Hunting bzz\mpc115s\115s\002 astral.wav
4R Rating: 4.0
4R Comment: Pumped noise
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ABX Results:
Original vs G:\Hunting bzz\mpc115s\115sGCC\002 astral.wav
7 out of 8, pval = 0.035
Original vs G:\Hunting bzz\mpc115s\115r\002 astral.wav
1 out of 1, pval = 0.500
ABC/HR Version 0.9b, 30 August 2002
Testname: MPC115
1R = G:\Hunting bzz\mpc115s\115s\003 badvilbel.wav
2R = G:\Hunting bzz\mpc115s\115r\003 badvilbel.wav
3R = G:\Hunting bzz\mpc115s\114\001 badvilbel.wav
4R = G:\Hunting bzz\mpc115s\115sGCC\003 badvilbel.wav
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General Comments:
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ABX Results:
Original vs G:\Hunting bzz\mpc115s\115r\003 badvilbel.wav
3 out of 4, pval = 0.313
ABC/HR Version 0.9b, 30 August 2002
Testname: MPC115
1L = G:\Hunting bzz\mpc115s\115s\004 fsol.wav
2L = G:\Hunting bzz\mpc115s\115sGCC\004 fsol.wav
3R = G:\Hunting bzz\mpc115s\115r\004 fsol.wav
4R = G:\Hunting bzz\mpc115s\114\001 fsol.wav
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General Comments:
Ugly
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1L File: G:\Hunting bzz\mpc115s\115s\004 fsol.wav
1L Rating: 1.0
1L Comment:
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2L File: G:\Hunting bzz\mpc115s\115sGCC\004 fsol.wav
2L Rating: 1.0
2L Comment:
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3R File: G:\Hunting bzz\mpc115s\115r\004 fsol.wav
3R Rating: 1.0
3R Comment:
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4R File: G:\Hunting bzz\mpc115s\114\001 fsol.wav
4R Rating: 1.0
4R Comment:
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ABX Results:
Original vs G:\Hunting bzz\mpc115s\115s\004 fsol.wav
16 out of 16, pval < 0.001
Original vs G:\Hunting bzz\mpc115s\115sGCC\004 fsol.wav
16 out of 16, pval < 0.001
Original vs G:\Hunting bzz\mpc115s\115r\004 fsol.wav
16 out of 16, pval < 0.001
Original vs G:\Hunting bzz\mpc115s\114\001 fsol.wav
16 out of 16, pval < 0.001
ABC/HR Version 0.9b, 30 August 2002
Testname: MPC115
1L = G:\Hunting bzz\mpc115s\114\001 Rebecca.wav
2L = G:\Hunting bzz\mpc115s\115r\005 Rebecca.wav
3R = G:\Hunting bzz\mpc115s\115s\005 Rebecca.wav
4L = G:\Hunting bzz\mpc115s\115sGCC\005 Rebecca.wav
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General Comments:
No problem
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ABX Results:
Original vs G:\Hunting bzz\mpc115s\114\001 Rebecca.wav
3 out of 5, pval = 0.500
ABC/HR Version 0.9b, 30 August 2002
Testname: MPC115
1L = G:\Hunting bzz\mpc115s\115sGCC\007 spahm.wav
2R = G:\Hunting bzz\mpc115s\115s\007 spahm.wav
3L = G:\Hunting bzz\mpc115s\114\001 spahm.wav
4R = G:\Hunting bzz\mpc115s\115r\007 spahm.wav
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General Comments:
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1L File: G:\Hunting bzz\mpc115s\115sGCC\007 spahm.wav
1L Rating: 2.0
1L Comment:
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2R File: G:\Hunting bzz\mpc115s\115s\007 spahm.wav
2R Rating: 4.0
2R Comment:
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3L File: G:\Hunting bzz\mpc115s\114\001 spahm.wav
3L Rating: 3.0
3L Comment:
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4R File: G:\Hunting bzz\mpc115s\115r\007 spahm.wav
4R Rating: 4.5
4R Comment:
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ABX Results:
Original vs G:\Hunting bzz\mpc115s\115sGCC\007 spahm.wav
8 out of 8, pval = 0.004
Original vs G:\Hunting bzz\mpc115s\115s\007 spahm.wav
7 out of 8, pval = 0.035
Original vs G:\Hunting bzz\mpc115s\114\001 spahm.wav
8 out of 8, pval = 0.004
Original vs G:\Hunting bzz\mpc115s\115r\007 spahm.wav
1 out of 3, pval = 0.875
G:\Hunting bzz\mpc115s\115sGCC\007 spahm.wav vs G:\Hunting bzz\mpc115s\115s\007 spahm.wav
8 out of 8, pval = 0.004
G:\Hunting bzz\mpc115s\115sGCC\007 spahm.wav vs G:\Hunting bzz\mpc115s\114\001 spahm.wav
8 out of 8, pval = 0.004
G:\Hunting bzz\mpc115s\115sGCC\007 spahm.wav vs G:\Hunting bzz\mpc115s\115r\007 spahm.wav
8 out of 8, pval = 0.004
ABC/HR Version 0.9b, 30 August 2002
Testname:
1L = G:\Hunting bzz\mpc115s\115s\008 transwave.wav
2R = G:\Hunting bzz\mpc115s\115sGCC\008 transwave.wav
3L = G:\Hunting bzz\mpc115s\114\001 transwave.wav
4R = G:\Hunting bzz\mpc115s\115r\008 transwave.wav
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General Comments:
Tested from second 11
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1L File: G:\Hunting bzz\mpc115s\115s\008 transwave.wav
1L Rating: 4.0
1L Comment:
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2R File: G:\Hunting bzz\mpc115s\115sGCC\008 transwave.wav
2R Rating: 2.0
2R Comment:
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3L File: G:\Hunting bzz\mpc115s\114\001 transwave.wav
3L Rating: 4.5
3L Comment:
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ABX Results:
Original vs G:\Hunting bzz\mpc115s\115s\008 transwave.wav
4 out of 6, pval = 0.344
Original vs G:\Hunting bzz\mpc115s\115sGCC\008 transwave.wav
7 out of 8, pval = 0.035
G:\Hunting bzz\mpc115s\115s\008 transwave.wav vs G:\Hunting bzz\mpc115s\115sGCC\008 transwave.wav
0 out of 1, pval = 1.000
Amnesia is from Amnesia - Ibiza (loco mix version), from the Ibiza maxi single (vinyl).
Astral is Astral Projection - Another World (from the Another World CD)
Badvilbel is Autechre - Second Bad Vilbel, from the Anvil Vapre CD
Fsol is The Future Sound of London - Among Myselves, from the Lifeforms CD
Rebecca is Rebecca Pidgeon - Granmother, from the Test CD n°10 of La Nouvelle Revue du Son.
I don't know the origin of Spahm.
Transwave is Transwave - The Rezwalker (London Live Remix), from the Helium CD.