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Public MP3 Listening Test @ 128 kbps - CLOSED
Sebastian Mares
post Oct 17 2008, 12:00
Post #1





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Greetings!

After months of endless discussion and preparation, the MP3 listening test is finally open.

The featured encoders, as most of you know already, are:

LAME 3.97
LAME 3.98.2
iTunes 8.0.1.11
Fraunhofer IIS mp3surround CL encoder v1.5
Helix v5.1 2005.08.09

The anchor used in this test is:

l3enc 0.99a as low anchor

If you want to read more before starting, the address of the test is http://www.listening-tests.info/mp3-128-1/. If you want to start right away, have a look at the readme. Please note that you do NOT have to test all samples - it is a great help even if you test one or two!

Info: The people who did not start testing already but who would like to participate, it would be very nice if you could focus especially on samples: 5, 6, 8, 9, 10, 11, 13, 14. Sample 1 already has 25 valid results, so please do not test it (of course, if you already did, you can submit your results for it, but if you just started, maybe invest time and effort in testing the aforementioned samples first).

Update: The test is scheduled to end on November 22nd, 2008.

Warning: There seem to be problems with ABC/HR when JRE 1.6 is installed. If you are affected by hangs, crashes or any other difficulties, please download and install JRE 1.5 Update 15 from http://java.sun.com/products/archive/j2se/5.0_15/index.html. You do NOT have to uninstall your existing copy of JRE 1.6 since both versions can be installed at the same time. However, if you have JRE 1.5 and JRE 1.6 installed, please make sure you start ABC/HR with JRE 1.5 manually. Since the working directory has to be the location where abchr.jar is stored, the best thing you can do is to open a command prompt window, navigate to the location where you stored abchr.jar and the rest of the files and then call "C:\Program Files\Java\jre1.5.0_15\bin\java.exe -jar abchr.jar". Of course, this is only an example which you have to adapt according to where java.exe is stored on your PC.

Note: As Hydrogenaudio Forums members and I found out, there is a bug in the iTunes MP3 encoder that is present in all iTunes versions since 5.0.1.4 (including the tested version 8.0.1.11). The problem manifests itself only on multi-core CPUs (both PCs and Macs) and leads to a significantly lower bitrate of the encoded samples. Apple engineers confirmed our findings and assured me that the next iTunes release will contain a fix for this problem. Please notice that the only functioning work-around is to disable all but one core in your computer's BIOS or to start Windows with the /numproc=1 parameter. Setting the iTunes process affinity to one core does NOT help.

Happy testing!

This post has been edited by Sebastian Mares: Nov 19 2008, 14:19


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Posts in this topic
- Sebastian Mares   Public MP3 Listening Test @ 128 kbps - CLOSED   Oct 17 2008, 12:00
- - Raiden   I've got problems with "Save test results...   Oct 17 2008, 16:00
|- - rednyrg721   QUOTE (Raiden @ Oct 17 2008, 21:00) I...   Oct 17 2008, 16:33
|- - Alexxander   QUOTE (Raiden @ Oct 17 2008, 17:00) I...   Oct 17 2008, 17:04
- - Synthetic Soul   FYI I have also had various problems with ABC/HR l...   Oct 17 2008, 16:57
- - Alex B   I am seeing the same issue. I have XP and Java 6 ...   Oct 17 2008, 17:07
- - stigc   Same problem here. Windows Xp and 1.6.0_10-rc-b28....   Oct 17 2008, 17:31
- - halb27   Same for me (Windows XP).   Oct 17 2008, 18:57
- - shakey_snake   Can I post the news of this iTunes encoder bug on ...   Oct 17 2008, 19:45
- - Sebastian Mares   shakey_snake, you can post it as the message is pu...   Oct 18 2008, 11:05
- - Sebastian Mares   I just recompiled ABC/HR using the latest JDK, JDO...   Oct 18 2008, 12:41
- - westgroveg   Although it's great that the encoders can adap...   Oct 19 2008, 22:01
|- - [JAZ]   QUOTE (westgroveg @ Oct 19 2008, 23:01) I...   Oct 20 2008, 00:51
|- - westgroveg   QUOTE (JAZ @ Oct 20 2008, 12:51) QUOTE (w...   Oct 20 2008, 01:18
|- - [JAZ]   QUOTE (westgroveg @ Oct 20 2008, 02:18) N...   Oct 20 2008, 18:22
|- - Mike Giacomelli   QUOTE (westgroveg @ Oct 19 2008, 20:18) Q...   Oct 21 2008, 03:29
|- - westgroveg   QUOTE (Mike Giacomelli @ Oct 21 2008, 15...   Oct 21 2008, 07:47
- - Ron Jones   Easy westgrove. Let's not start the name calli...   Oct 20 2008, 02:02
- - Sebastian Mares   westgroveg, the settings and encoders chosen for t...   Oct 20 2008, 06:35
- - Ron Jones   I went ahead and consolidated all the samples into...   Oct 20 2008, 15:50
- - Bodhi   Hi, Why V5.7? I've read it but I can't re...   Oct 20 2008, 18:32
|- - Sebastian Mares   QUOTE (Bodhi @ Oct 20 2008, 19:32) Hi, W...   Oct 21 2008, 06:38
- - Zarggg   Did you not read the post where we said that this ...   Oct 21 2008, 17:40
|- - lvqcl   QUOTE (Zarggg @ Oct 21 2008, 20:40) Back ...   Oct 21 2008, 20:38
- - Neasden   Sebastian, keep the good work. A listening test li...   Oct 21 2008, 19:01
|- - Polar   QUOTE (Neasden @ Oct 21 2008) Sebastian, keep...   Oct 22 2008, 11:55
- - uart   I've just a had areally quick listen to the sa...   Oct 22 2008, 17:07
|- - halb27   QUOTE (uart @ Oct 22 2008, 18:07) Wow fro...   Oct 22 2008, 18:01
- - uart   Oh yeah I'm sure they'll be other artifact...   Oct 22 2008, 18:51
|- - lvqcl   QUOTE (uart @ Oct 22 2008, 21:51) But the...   Oct 22 2008, 19:43
|- - /mnt   QUOTE (uart @ Oct 22 2008, 18:51) Oh yeah...   Oct 22 2008, 20:00
- - melomaniac   First, I would like to thank Sebastian and Alex fo...   Oct 23 2008, 02:10
|- - Alex B   QUOTE (melomaniac @ Oct 23 2008, 04:10) F...   Oct 23 2008, 09:26
|- - melomaniac   QUOTE (Alex B @ Oct 23 2008, 10:26) Once ...   Oct 23 2008, 10:24
- - halb27   While testing it happens rather often that I find ...   Oct 23 2008, 10:17
|- - Alex B   QUOTE (halb27 @ Oct 23 2008, 12:17) While...   Oct 23 2008, 11:28
|- - halb27   QUOTE (Alex B @ Oct 23 2008, 12:28) You c...   Oct 23 2008, 11:49
|- - Alex B   QUOTE (halb27 @ Oct 23 2008, 13:49) Just ...   Oct 23 2008, 12:22
|- - halb27   QUOTE (Alex B @ Oct 23 2008, 13:22) QUOTE...   Oct 23 2008, 13:47
- - Alexxander   As I had Java crashes when saving results or sessi...   Oct 24 2008, 15:30
- - Alex B   QUOTE (Alexxander @ Oct 24 2008, 17:30) S...   Oct 24 2008, 16:05
- - Sebastian Mares   Thanks for the feedback you guys (Alex B and other...   Oct 24 2008, 16:16
- - Sebastian Mares   First results arrived today!   Oct 25 2008, 20:57
- - Sebastian Mares   Yay, first results for all samples received today....   Oct 26 2008, 11:30
|- - Bodhi   QUOTE (Sebastian Mares @ Oct 26 2008, 12...   Oct 26 2008, 20:57
- - Sebastian Mares   Patience, young padawan...   Oct 26 2008, 21:36
|- - Bodhi   QUOTE (Sebastian Mares @ Oct 26 2008, 22...   Oct 26 2008, 22:07
|- - Bodhi   QUOTE (Sebastian Mares @ Oct 26 2008, 22...   Oct 28 2008, 11:13
- - melomaniac   I've just posted my results and one encoder su...   Oct 26 2008, 22:09
- - jmartis   I downloaded ABC/HR, I also downloaded a sample pa...   Oct 26 2008, 22:19
|- - melomaniac   QUOTE (jmartis @ Oct 26 2008, 23:19) The ...   Oct 26 2008, 22:23
|- - Sebastian Mares   QUOTE (jmartis @ Oct 26 2008, 22:19) I do...   Oct 26 2008, 23:03
|- - lvqcl   QUOTE (jmartis @ Oct 27 2008, 01:19) Prob...   Oct 26 2008, 23:41
- - halb27   My sample07 is Suzanne Vega (Tom's Diner) as w...   Oct 26 2008, 23:04
- - Sebastian Mares   Just downloaded Sample07 from both mirrors and it...   Oct 26 2008, 23:08
|- - jmartis   QUOTE (Sebastian Mares @ Oct 27 2008, 00...   Oct 27 2008, 11:49
- - /mnt   My Sample 7 file is Tom's Diner anyway and not...   Oct 27 2008, 02:06
|- - halb27   QUOTE (/mnt @ Oct 27 2008, 03:06) ... I h...   Oct 27 2008, 06:53
|- - Alex B   QUOTE (/mnt @ Oct 27 2008, 04:06) I have ...   Oct 27 2008, 11:12
|- - /mnt   QUOTE (Alex B @ Oct 27 2008, 11:12) QUOTE...   Oct 27 2008, 11:37
|- - Alex B   QUOTE (/mnt @ Oct 27 2008, 13:37) I have ...   Oct 27 2008, 11:56
|- - melomaniac   QUOTE (Alex B @ Oct 27 2008, 12:56) QUOTE...   Oct 27 2008, 12:05
|- - /mnt   QUOTE (Alex B @ Oct 27 2008, 11:56) QUOTE...   Oct 27 2008, 12:17
- - Neasden   If one encoder SURPRISES you then this definitely ...   Oct 27 2008, 02:59
- - melomaniac   QUOTE (halb27 @ Oct 27 2008, 07:53) I hav...   Oct 27 2008, 10:44
- - Alex B   Normally we should not discuss about the test samp...   Oct 27 2008, 12:19
- - halb27   In case I know what to listen for (and I'm se...   Oct 27 2008, 12:41
|- - Lyx   Adding to halb's comments: This may also be r...   Oct 27 2008, 12:56
- - Alex B   Many of us already knew that a MP3 VBR test @ 128 ...   Oct 27 2008, 13:31
|- - halb27   QUOTE (Alex B @ Oct 27 2008, 14:31) Parti...   Oct 27 2008, 14:37
|- - Ron Jones   QUOTE (Alex B @ Oct 27 2008, 05:31) Parti...   Oct 31 2008, 16:03
|- - Sebastian Mares   QUOTE (Ron Jones @ Oct 31 2008, 16:03) Wo...   Oct 31 2008, 16:08
|- - [JAZ]   QUOTE (Ron Jones @ Oct 31 2008, 17:03) [T...   Oct 31 2008, 23:00
- - halb27   sample12: for a change a sample with 4 encoders ha...   Oct 28 2008, 20:41
|- - /mnt   QUOTE (halb27 @ Oct 28 2008, 20:41) sampl...   Oct 28 2008, 22:08
- - Alexxander   Just sent my results. I had a nice and sometimes h...   Oct 29 2008, 12:12
- - lexor   Having trouble running the test here. I've dow...   Oct 29 2008, 14:55
- - Sebastian Mares   I think I know what the problem is... What happens...   Oct 29 2008, 15:01
|- - lexor   QUOTE (Sebastian Mares @ Oct 29 2008, 10...   Oct 29 2008, 15:07
|- - Sebastian Mares   QUOTE (lexor @ Oct 29 2008, 15:07) QUOTE ...   Oct 29 2008, 15:29
|- - lexor   QUOTE (Sebastian Mares @ Oct 29 2008, 10...   Oct 29 2008, 17:03
- - Alexxander   I don't know if this might help but I explain ...   Oct 29 2008, 15:16
- - [JAZ]   Am I the only one to not be able to find the low a...   Oct 30 2008, 21:39
- - halb27   I remember that with one sample (it will be sample...   Oct 31 2008, 09:12
|- - /mnt   QUOTE (halb27 @ Oct 31 2008, 09:12) I rem...   Oct 31 2008, 12:36
|- - Alex B   QUOTE (/mnt @ Oct 31 2008, 13:36) ... I d...   Oct 31 2008, 18:35
- - Sebastian Mares   Judging by the number of results, an extension is ...   Oct 31 2008, 18:38
- - Sebastian Mares   I need at least twice as many results as I have no...   Nov 1 2008, 20:31
|- - caligae   QUOTE (Sebastian Mares @ Nov 1 2008, 21:3...   Nov 2 2008, 09:44
|- - lvqcl   QUOTE (Sebastian Mares @ Nov 1 2008, 22:3...   Nov 3 2008, 11:05
- - Sebastian Mares   The test was extended to end on November 8th, 2008...   Nov 1 2008, 21:00
- - pro_optimizer   There's one statistic which hasn't been co...   Nov 2 2008, 04:35
- - Sebastian Mares   Unfortunately, I received only one single result s...   Nov 5 2008, 08:42
|- - Alexxander   QUOTE (Sebastian Mares @ Nov 5 2008, 09:4...   Nov 5 2008, 09:50
- - gerwen   Sent in my results today. Really tough to disti...   Nov 7 2008, 15:48
|- - kwanbis   Was the listing test announcement submitted to doo...   Nov 7 2008, 20:04
- - Sebastian Mares   doom9 yes, all others no. Roberto all sent the ann...   Nov 8 2008, 11:15
|- - kwanbis   QUOTE (Sebastian Mares @ Nov 8 2008, 10:1...   Nov 8 2008, 19:58
- - elmar3rd   IMHO, just extend the test. Maybe for weeks. The r...   Nov 8 2008, 13:36
- - Sebastian Mares   I could extend it for let's say a maximum of t...   Nov 8 2008, 20:52
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