Author Topic: Public MP3 Listening Test @ 128 kbps - OPEN  (Read 6423 times)

Sebastian Mares

  • Guest
Public MP3 Listening Test @ 128 kbps - OPEN
« on: 19 Oct '08 - 08:58 »
Greetings!

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

The featured encoders 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

The test is scheduled to end on November 3rd, 2008. Its address is: http://www.listening-tests.info/mp3-128-1/

Warning 1: 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.

Warning 2: 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 by navigating to "C:\Program Files\Java\jre1.5.0_15\bin\" and launching "java.exe -jar abchr.jar" (this is an example only - please adapt the paths according to your needs).

Happy testing!

Brian

  • Posts: 733
Re: Public MP3 Listening Test @ 128 kbps - OPEN
« Reply #1 on: 19 Oct '08 - 10:59 »
Could you just explain why the Fraunhofer mp3surround encoder has been chosen, rather than the `straight' mp3 encoder, please? This seems to introduce an element of not comparing like with like. But I don't claim any expert knowledge. Many thanks.

Sebastian Mares

  • Guest
Re: Public MP3 Listening Test @ 128 kbps - OPEN
« Reply #2 on: 19 Oct '08 - 11:05 »
It is the latest version of the FhG encoder and beside surround it can also encode stereo (like for this test).

Zarggg

  • Posts: 1242
Re: Public MP3 Listening Test @ 128 kbps - OPEN
« Reply #3 on: 20 Oct '08 - 19:08 »
Been looking forward to this. Hopefully I can find the time to take part, as this would be the first one for me! :)

Edit 2008-10-21: On second thought, I was only able to notice a difference on one sample in each set. Since it was so obvious to me, I'm going to assume that was the low anchor. Rather than skewing the results with my untrained ears, I think I'll sit this one out. Looking forward to the results, though!
« Last Edit: 21 Oct '08 - 17:31 by Zarggg »

Sebastian Mares

  • Guest
Re: Public MP3 Listening Test @ 128 kbps - OPEN
« Reply #4 on: 22 Oct '08 - 14:50 »
You can always take the test and submit the results - if you cannot hear any differences. :)

Sebastian Mares

  • Guest
Re: Public MP3 Listening Test @ 128 kbps - OPEN
« Reply #5 on: 1 Nov '08 - 20:02 »
The test was extended to end on November 8th, 2008.