Hydrogenaudio Forums > Vorbis aoTuV b5 @ q5 testing samples

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Mo0zOoH

Oct 26 2006, 05:29

Here are my favourite samples I use to test Vorbis at q4 and q5. They represent Vorbis's long known problem with sharp noise and feature some nifty pre-echo on top of that.

The samples were taken from the following tracks:

Autechre — [Gantz Graf EP #01] Gantz Graf [3:58];
Abfahrt Hinwil — [VA — Everything Is Green #02] Everything Is Green [4:25];
Nine Inch Nails — [Quake OST #01] Quake Theme [5:08].

CODE

foo_abx v1.2 report
foobar2000 v0.8.3
2006/10/26 01:01:52

File A: file://C:\Files\test samples\ae_gg.wav
File B: file://C:\Files\test samples\ae_gg.ogg

01:01:52 : Test started.
01:02:18 : 01/01  50.0%
01:03:00 : 02/02  25.0%
01:03:22 : 03/03  12.5%
01:05:29 : 04/04  6.3%
01:06:26 : 05/05  3.1%
01:08:01 : 06/06  1.6%
01:09:23 : 07/07  0.8%
01:09:56 : 08/08  0.4%
01:10:10 : Test finished.

 ---------- 
Total: 8/8 (0.4%)

That was rather easy. Vorbis just smeared the granular synthesis.

CODE

foo_abx v1.2 report
foobar2000 v0.8.3
2006/10/26 14:42:34

File A: file://C:\Files\test samples\eig.wav
File B: file://C:\Files\test samples\eig.ogg

14:42:34 : Test started.
14:43:13 : 01/01  50.0%
14:43:24 : 02/02  25.0%
14:43:45 : 03/03  12.5%
14:43:55 : 04/04  6.3%
14:44:06 : 05/05  3.1%
14:44:18 : 06/06  1.6%
14:44:31 : 07/07  0.8%
14:44:49 : 08/08  0.4%
14:44:51 : Test finished.

 ---------- 
Total: 8/8 (0.4%)

Easy, again. On the other hand, LAME -b 320 fails on this sample completely, even worse than aoTuV at q5 despite twice the bit rate.
BTW, this is my favourite pre-echo sample, the attacks are sharp but not very disturbing, and the background is very clean. The track itself is very nice as well.

CODE

foo_abx v1.2 report
foobar2000 v0.8.3
2006/10/26 14:46:39

File A: file://C:\Files\test samples\nin_quake.wav
File B: file://C:\Files\test samples\nin_quake.ogg

46:39 : Test started.
47:14 : 01/01  50.0%
47:30 : 02/02  25.0%
47:45 : 02/03  50.0%
48:20 : 03/04  31.3%
50:09 : 04/05  18.8%
53:24 : 04/06  34.4%
53:27 : Trial reset.
54:10 : 01/01  50.0%
54:33 : 02/02  25.0%
54:57 : 03/03  12.5%
55:22 : 04/04  6.3%
57:37 : 05/05  3.1%
58:23 : 06/06  1.6%
59:18 : 07/07  0.8%
59:48 : 08/08  0.4%
59:49 : Test finished.

 ---------- 
Total: 12/14 (0.6%)

That was much harder. The difference is very subtle, almost nonexistant background noise. At my first attempt, I was confident at the beginning, but shortly after started to fail and decided to take a short break. After that, I once again understood the difference to concentrate on, and passed the test without any further mistakes.

Enjoy.

EDIT: Oh, completely forgot to post my testing "equipment".
Soundcard: Creative SB Live! 5.1.
Headphones: Sharp HP-MD33-S.

VolMax

Oct 26 2006, 09:45

It was hard for me. Difference is negligible.

BS; Lancer(SSE) [20061005] (based on aoTuV r1 [20051117])
-q 3

CODE

foo_abx v1.2 report
foobar2000 v0.8.3
2006/10/26 21:21:41

File A: file://C:\tmp\eig.ogg
File B: file://C:\tmp\eig.wv

21:21:42 : Test started.
21:22:29 : 01/01  50.0%
21:22:44 : 02/02  25.0%
21:22:49 : 02/03  50.0%
21:23:17 : 03/04  31.3%
21:23:26 : 03/05  50.0%
21:23:37 : 04/06  34.4%
21:23:50 : 05/07  22.7%
21:24:01 : 06/08  14.5%
21:24:08 : 07/09  9.0%
21:24:38 : 08/10  5.5%
21:25:14 : 08/11  11.3%
21:25:36 : 09/12  7.3%
21:25:41 : Test finished.

----------
Total: 9/12 (7.3%)

ae_gg.mp3: Can't ABX lame -V 0

Audigy1 + rarity Electronika_TDS-5M + Bad_ears.sys ;-)

P.S. "eig.wv" - i like it!

halb27

Oct 26 2006, 12:26

Thanks a lot for your great eig sample.

I am pretty deaf as towards pre-echo, but with this sample even me can hear the problem.

Firon

Oct 27 2006, 15:50

Good lord, LAME handles this one poorly. Even at 320kbps, it's still audible! It's much worse than castanets.

halb27

Oct 27 2006, 16:20

QUOTE(Firon @ Oct 27 2006, 23:50)

... LAME handles this one poorly. ...

I'm pretty sure other mp3 encoders will have similar problems, and that's what makes it interesting for the upcoming listening tst.

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