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gt3b2 better than aotuvb5 @ q6?!?
post Dec 5 2007, 17:10
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hi guys!

first off: i am new to this forum so if i am asking stupid questions, please be gentle with me! ;-)

i have been an avid user of the gt3b2 vorbis encoder for a long time now. i use it at q6 and find it gives outstanding results. as a matter of fact, i find it extremely difficult to ABX a difference between it and the original wav file! :-)
(whoever wrote gt3b2 -> great job!)

but knowing it is very old i checked here (THE authority in music encoding ;-) for any new developments.

sure enough: aotuvb5 is HA's recommended vorbis encoder. no prob - i happily downloaded and tested it (also @ q6) vs. gt3b2.

then my surprise: there was a clear difference between the two, which i could clearly hear in an ABX test on some more "tricky" music pieces:

WinABX v0.42 test report
11/30/2007 11:40:24

A file: C:\Temp\Ripped Files\Iaora Tahiti.02.Mouse on Mars.Kompod_aotuvb5.wav
B file: C:\Temp\Ripped Files\Iaora Tahiti.02.Mouse on Mars.Kompod_GT3B2.wav

Start position 00:00.0, end position 04:08.4
11:47:36 1/1 p=50.0%
11:48:18 2/2 p=25.0%
11:48:45 3/3 p=12.5%
11:49:27 3/4 p=31.2%
11:50:06 4/5 p=18.8%
11:51:07 4/6 p=34.4%
11:52:04 5/7 p=22.7%
11:53:11 6/8 p=14.5%
11:54:14 7/9 p=9.0%

WinABX v0.42 test report
11/30/2007 11:55:06

A file: C:\Temp\Ripped Files\Iaora Tahiti.06.Mouse on Mars.Kanu_aotuvb5.wav
B file: C:\Temp\Ripped Files\Iaora Tahiti.06.Mouse on Mars.Kanu_GT3B2.wav

11:55:29 1/1 p=50.0%
11:55:50 2/2 p=25.0%
11:56:09 2/3 p=50.0%
11:56:44 2/4 p=68.8%
11:57:18 3/5 p=50.0%
11:57:45 4/6 p=34.4%
11:58:44 4/7 p=50.0%
11:59:22 5/8 p=36.3%
12:00:05 5/9 p=50.0%
12:00:27 6/10 p=37.7%

WinABX v0.42 test report
11/30/2007 12:00:56

A file: C:\Temp\Ripped Files\Unison.03.Angels & Agony.Unison_aotuvb5.wav
B file: C:\Temp\Ripped Files\Unison.03.Angels & Agony.Unison_GT3B2.wav

12:01:15 1/1 p=50.0%
12:01:38 1/2 p=75.0%
12:02:28 2/3 p=50.0%
12:02:44 3/4 p=31.2%
12:03:52 4/5 p=18.8%
12:04:10 5/6 p=10.9%
12:04:40 6/7 p=6.2%
12:05:40 7/8 p=3.5%
12:06:01 8/9 p=2.0%
12:06:12 9/10 p=1.1%

WinABX v0.42 test report
11/30/2007 12:06:38

A file: C:\Temp\Ripped Files\Zephyr- 48_24_aotuvb5.wav
B file: C:\Temp\Ripped Files\Zephyr- 48_24_GT3B2.wav

12:07:09 1/1 p=50.0%
12:07:53 2/2 p=25.0%
12:08:19 3/3 p=12.5%
12:08:34 4/4 p=6.2%
12:09:06 4/5 p=18.8%
12:09:29 5/6 p=10.9%
12:10:22 6/7 p=6.2%
12:10:55 6/8 p=14.5%
12:13:16 7/9 p=9.0%
12:13:56 8/10 p=5.5%

so far so good. BUT: to me gt3b2 sounds BETTER than aotuvb5?!?!?

in my ears:

more "open", better staging/positioning (like in a concert hall) and delightful lightness.
but a slight tendency to "muddy" sound and seems to make some passages louder (dynamic loss?).

somehow "darker", more "closed" sounding, like in a small room, more restrained.
however, instruments and voices seemed to sound more precise/"clean" and there was less apparent loudening of certain passages.

are there some special settings i need to do to aotuvb5 i simply missed? (yes, i read the wiki) or is it my choice of tracks? (most is 16bit/44kHz electronic, but "zephyr" is a 24bit/48kHz acapella choir) is there a possibility that the decoder i use (a squeezebox 3 with optical dig. out) works better with gt3b2 than with aotuvb5?

thanks for your thoughts, guys! :-)
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post Dec 5 2007, 17:56
Post #2

Winamp Developer

Group: Developer
Posts: 670
Joined: 17-July 05
From: Brooklyn, NY
Member No.: 23375

2 things:

Are the bitrate identical? The quality scale will only have meaning for a particular encoder. You should adjust the quality for each encoder until the bitrates come identically.

Can you ABX against the original WAV file? Perhaps what you're hearing is actually flaws in the gt3b2 encoder. ABX'ing two lossy files doesn't make a whole lot of sense.
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