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Public AAC Listening Test @ ~96 kbps [July 2011]: Results, Results and post-test discussion
IgorC
post Aug 23 2011, 19:56
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After the long time of preparations, discussions and realization of the test the results are finally here.

http://listening-tests.hydrogenaudio.org/i...-a/results.html

Summary: Apple won, FhG is the second, Coding Technologies is the third and Nero is the last

I appreciate all people who has supported the test and participated in it.

This post has been edited by IgorC: Aug 23 2011, 20:12
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mjb2006
post Aug 25 2011, 22:50
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Even though I sent in results, they didn't get included at all, neither accepted nor rejected. I sent them to the correct address on the last day (Aug. 20). Anyway, going through them now, I found that I kind of botched #04, which was the clip from the intro to OMD's "Enola Gay".

The second half of the clip has the hi-hats panned slightly to the right of center. All the encoders except ffmpeg(!) seem to put the hi-hats pretty much dead-center. The panning is so slight that I didn't notice the issue at all until the 5th comparison, which for me was Apple CVBR (Sample04_2). In that comparison, the panning was the only difference I noticed.

At that point, I should've checked the reference clip, but instead I checked my previous answers, and found that on one comparison (which turns out to be ffmpeg), the encoded version sounded really bad, but the hi-hats were panned slightly to the right, so I incorrectly guessed that the panning was an artifact. Oops. So for comparison #5, I guessed that CVBR was the original and I rated the actual original as inferior.

Now I feel like I should've listened to the reference clip at that point and spotted it there, then gone back and changed my answers on the previous comparisons. But instead I just left them as they were:
  • comparison #1: no differences noticed between original & Sample04_4 (FhG)
  • comparison #2: Sample04_6 (ffmpeg) rated very inferior due to ringing synths, syrupy hi-hats
  • comparison #3: Sample04_1 (Nero) rated somewhat inferior due to ringing synths
  • comparison #4: no differences noticed between original & Sample04_3 (TVBR)

If I were to go back after noticing the panning issue and listen for it in the comparisons I had already completed, I would've noticed it in #1 and #4, and would've correctly spotted and downgraded my ratings for the encoded clips. But doesn't going back like that, once I've told myself what to listen for, invalidate those results? If I only "naturally" notice the panning some of the time, shouldn't that just be accepted?

This post has been edited by mjb2006: Aug 25 2011, 22:54
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- IgorC   Public AAC Listening Test @ ~96 kbps [July 2011]: Results   Aug 23 2011, 19:56
- - benski   It would be interesting to do a rank-sum analysis ...   Aug 23 2011, 20:18
|- - Garf   QUOTE (benski @ Aug 23 2011, 21:18) It wo...   Aug 23 2011, 20:27
||- - benski   QUOTE (Garf @ Aug 23 2011, 15:27) QUOTE (...   Aug 23 2011, 20:54
||- - Garf   QUOTE (benski @ Aug 23 2011, 21:54) The F...   Aug 23 2011, 21:11
|- - C.R.Helmrich   QUOTE (benski @ Aug 23 2011, 21:18) ... w...   Aug 23 2011, 20:42
||- - Garf   QUOTE (C.R.Helmrich @ Aug 23 2011, 21:42)...   Aug 23 2011, 20:47
|||- - lvqcl   QUOTE (Garf @ Aug 23 2011, 23:47) Basical...   Aug 27 2011, 20:22
|||- - no404error   QUOTE (lvqcl @ Aug 27 2011, 22:22) CVBR, ...   Sep 4 2011, 04:01
||- - benski   QUOTE (C.R.Helmrich @ Aug 23 2011, 15:42)...   Aug 23 2011, 20:52
|- - IgorC   QUOTE (benski @ Aug 23 2011, 16:18) It wo...   Aug 23 2011, 21:01
|- - benski   QUOTE (IgorC @ Aug 23 2011, 16:01) QUOTE ...   Aug 23 2011, 21:07
|- - IgorC   QUOTE (benski @ Aug 23 2011, 17:07) Actua...   Aug 23 2011, 21:11
- - IgorC   I should also mention that I've participated i...   Aug 23 2011, 21:30
- - zima   Maybe there could be a legend for X-axis, the abbr...   Aug 23 2011, 21:37
- - lvqcl   It is interesting that QT tvbr and cvbr encoded fi...   Aug 23 2011, 22:05
- - IgorC   zima, will fix it later. QUOTE (lvqcl @ Au...   Aug 23 2011, 22:11
- - Alexxander   Thanks to all who participated in this test and to...   Aug 23 2011, 22:31
|- - Garf   QUOTE (Alexxander @ Aug 23 2011, 23:31) I...   Aug 23 2011, 23:02
- - Dakeryas   Many thanks for the test ! Interesting to not...   Aug 23 2011, 23:11
- - IgorC   I've noticed that previous version of Nero 1.0...   Aug 23 2011, 23:51
- - Gornot   To be perfectly honest, I am surprised that FhG di...   Aug 24 2011, 00:29
- - /mnt   Interesting results, I gotta see if the pre-echo h...   Aug 24 2011, 01:23
- - kennedyb4   If it is fair to say that many of the samples were...   Aug 24 2011, 01:42
- - Sebastian Mares   It appears to me that the low anchor was way too b...   Aug 24 2011, 07:29
|- - Garf   QUOTE (Sebastian Mares @ Aug 24 2011, 08...   Aug 24 2011, 09:35
|- - Nezmer   QUOTE (Garf @ Aug 24 2011, 10:35) Probabl...   Aug 24 2011, 11:35
|- - Garf   QUOTE (Nezmer @ Aug 24 2011, 12:35) QUOTE...   Aug 24 2011, 12:46
|- - Nezmer   QUOTE (Garf @ Aug 24 2011, 13:46) QUOTE (...   Aug 24 2011, 18:26
- - greynol   I was wondering the same thing.   Aug 24 2011, 07:49
- - C.R.Helmrich   Some bit-rate statistics which were presented in p...   Aug 24 2011, 18:27
|- - Garf   QUOTE (C.R.Helmrich @ Aug 24 2011, 19:27)...   Aug 25 2011, 07:29
- - Zarggg   Just looking for a quick verification on whether I...   Aug 25 2011, 18:06
|- - IgorC   QUOTE (Zarggg @ Aug 25 2011, 14:06) Am I ...   Aug 25 2011, 18:28
- - greynol   CVBR and TVBR are statistically tied. One did not...   Aug 25 2011, 18:12
|- - Zarggg   QUOTE (greynol @ Aug 25 2011, 13:12) CVBR...   Aug 25 2011, 22:47
|- - Garf   QUOTE (greynol @ Aug 25 2011, 19:12) CVBR...   Aug 26 2011, 07:20
- - greynol   That assumes facts not in evidence.   Aug 25 2011, 19:04
- - Gecko   First, thank you IgorC and everyone involved! ...   Aug 25 2011, 20:24
|- - IgorC   QUOTE (Gecko @ Aug 25 2011, 16:24) First,...   Aug 26 2011, 03:30
||- - mjb2006   QUOTE (IgorC @ Aug 25 2011, 20:30) I do n...   Aug 26 2011, 05:18
||- - IgorC   QUOTE (mjb2006 @ Aug 26 2011, 01:18) Anyw...   Aug 26 2011, 05:24
|- - Garf   QUOTE (Gecko @ Aug 25 2011, 21:24) a) Do ...   Aug 26 2011, 07:16
|- - IgorC   QUOTE (Garf @ Aug 26 2011, 03:16) Always ...   Aug 26 2011, 08:51
- - mjb2006   Even though I sent in results, they didn't get...   Aug 25 2011, 22:50
- - Gecko   Thank you IgorC and Garf for answering my question...   Aug 26 2011, 10:28
|- - IgorC   QUOTE (Gecko @ Aug 26 2011, 06:28) Given ...   Aug 26 2011, 11:20
||- - Garf   QUOTE (IgorC @ Aug 26 2011, 12:20) QUOTE ...   Aug 27 2011, 17:48
|- - Garf   QUOTE (Gecko @ Aug 26 2011, 11:28) In the...   Aug 27 2011, 17:39
- - IgorC   I found the first and the last graphs to be partic...   Aug 27 2011, 21:46
|- - lvqcl   QUOTE (IgorC @ Aug 28 2011, 00:46) I thin...   Aug 27 2011, 22:20
- - IgorC   Yeah   Aug 27 2011, 22:39
- - IgorC   BTW if someone want to organize the next public te...   Oct 1 2011, 20:21
- - jukkap   How about 48kbps HE AAC ? Or low bitrate multiform...   Oct 1 2011, 20:49
|- - IgorC   QUOTE (jukkap @ Oct 1 2011, 16:49) How ab...   Oct 10 2011, 23:17
|- - jukkap   QUOTE (IgorC @ Oct 10 2011, 23:17) The la...   Oct 20 2011, 10:04
- - IgorC   Well, the last time we have tested LC-AAC encoders...   Oct 1 2011, 21:58
- - jukkap   QUOTE (IgorC @ Oct 1 2011, 22:58) Can You...   Oct 2 2011, 05:10
- - IgorC   Late but still here. Some participants have answ...   Oct 23 2011, 07:14


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