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lame 3.97 alpha 6 testing thread
Gabriel
post Jan 14 2005, 10:56
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Compared to 3.97a5, cbr/abr modes are adjusted. Vbr modes are not yet changed compared to pevious alpha.

Results from 3.97a5:
http://www.hydrogenaudio.org/forums/index....showtopic=30547

edit: the former X10 mode is now remapped to X9 and used by default on abr/cbr.

This post has been edited by Gabriel: Jan 14 2005, 16:38
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guruboolez
post Jan 17 2005, 10:06
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TEST #1: 128 kbps ABR: ringing and --athlower switch


I’ve began the 3.97a6 testing phase by playing with the --athlower switch. The main purpose was to find a good value which removes most of ringing issues I could hear with lame. For this introductive phase, I’ve selected four critical samples. I insist: these samples are not representative of ‘general music’. Last and not least, the listening conditions are also exceptional: high listening volume, in order to easily hear the ringing problems.

I’ve compared the following settings:
• lame 3.90.3 --alt-preset 128
• lame 3.97a6 --preset 128
• lame 3.97a6 --preset 128 --athlower 5
• lame 3.97a6 --preset 128 --athlower 10

Samples are available here.

RESULTS


CODE
                         3.97a5        3.97a6       3.97a6         3.97a6
                     abr128 X10,10     abr128    abr128 ATHlw5  abr128 ATHlw10

Die Lotosblume            2.0           3.0          3.5            4.5
Lamento della ninfa       1.5           3.0          3.5            4.0
LisztBMinor               1.0           2.0          2.5            4.0
Quis non posset           1.0           1.5          2.0            4.5
                Means   1.38          2.38         2.88           4.25

click here for log files

COMMENTS:


• there’s always a real difference between alpha 5 and alpha 6: lower ringing with the newest alpha, but still annoying with this kind of samples at high listening volume.
• --athlower 5 leads to slightly reduce the amount of audible ringing. Good point, but still annoying artifacts.
• --athlower 10 conduces most often to a big quality jump in my opinion. Files are always nearly transparent, at least with high but not totally crazy output listening level.


STATISTICS:

If some people would play with statistic tool, just copy and paste the following table:
CODE
[CODE]
3.97a5    a6deft  a6ATH5    a6ATH10
2.0    3.0    3.5    4.5
1.5    3.0    3.5    4.0
1.0    2.0    2.5    4.0
1.0    1.5    2.0    4.5


• ANOVA ANALYSIS
a6ATH10 is better than a6ATH5, a6deft, 3.97a5
a6ATH5 is better than 3.97a5
a6deft is better than 3.97a5

• TUKEY PARAMETRIC ANALYSIS
a6ATH10 is better than a6ATH5, a6deft, 3.97a5
a6ATH5 is better than 3.97a5
a6deft is better than 3.97a5



With this kind of samples, --athlower switch lead to a pretty quality improvement. But is it always true? What will happen when using this additional switch with totally different files? Could it reduce quality, but putting unnecessary bits for inaudible signals?
In order to answer to this question, I’ve tested the impact of this switch by testing it with the same various samples used last week.

This post has been edited by guruboolez: Dec 29 2005, 23:03
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Posts in this topic
- Gabriel   lame 3.97 alpha 6 testing thread   Jan 14 2005, 10:56
- - john33   In case you haven't found it yet, alpha 6 is a...   Jan 14 2005, 11:39
- - westgroveg   Actually alpha 5 not 6: QUOTE ABC/HR Version 1.0, ...   Jan 14 2005, 13:30
- - john33   For anyone who has downloaded the alpha 6 from Rar...   Jan 14 2005, 14:27
|- - westgroveg   QUOTE (john33 @ Jan 15 2005, 01:27 AM)For any...   Jan 14 2005, 14:32
- - whcanilang   Nice! The results of 3.97a testing look promi...   Jan 14 2005, 22:08
- - mithrandir   This is my hunch on vbr-new. As guruboolez mentio...   Jan 14 2005, 22:25
- - westgroveg   QUOTE ABC/HR Version 1.0, 6 May 2004 Testname: 1...   Jan 15 2005, 12:20
- - LoFiYo   I have a sample where 3.97a6 generates a blip nois...   Jan 15 2005, 17:48
|- - LoFiYo   QUOTE (LoFiYo @ Jan 15 2005, 12:48 PM)I have ...   Jan 16 2005, 19:15
- - [proxima]   LAME CBR 128 kbps ringing test This test includes...   Jan 16 2005, 20:45
- - guruboolez   TEST #1: 128 kbps ABR: ringing and --athlower swit...   Jan 17 2005, 10:06
- - guruboolez   TEST #2: 128 kbps ABR Samples: • all ff123...   Jan 17 2005, 10:07
- - guruboolez   TEST #3: 128 kbps ABR with classical music only S...   Jan 17 2005, 10:08
- - Gabriel   Explanations regarding the current ATH status: It...   Jan 17 2005, 10:41
|- - [proxima]   QUOTE (Gabriel @ Jan 17 2005, 10:41 AM)The sh...   Jan 17 2005, 13:05
|- - guruboolez   QUOTE (Gabriel @ Jan 17 2005, 10:41 AM)note: ...   Jan 18 2005, 15:11
- - Gabriel   My mistake, the switch is --athcurve xxx. xxx is a...   Jan 17 2005, 13:54
- - Gabriel   Regarding vbr presets: I will adjust presets up to...   Jan 18 2005, 13:43
- - sony666   HI, foobar ABX plugin with replaygain, medicore So...   Jan 20 2005, 01:17
- - sony666   nasty (CODE) tag problem, please delete   Jan 20 2005, 01:20
- - sony666   CODEVELVET (11.878s) ------ CBR 128 -96...   Jan 20 2005, 01:21
- - guruboolez   TEST #4: --preset standard listening test This te...   Jan 20 2005, 09:34
- - guruboolez   TEST #5: -q0 switch In addition, I’ve just tried ...   Jan 20 2005, 09:36
- - Gabriel   Thank you very much for those results. *preset st...   Jan 20 2005, 10:10
|- - guruboolez   QUOTE (Gabriel @ Jan 20 2005, 10:10 AM)I am w...   Jan 20 2005, 10:19
|- - guruboolez   APPENDIX TO TEST#4: --preset standard QUOTE (Gabr...   Jan 24 2005, 08:41
- - uart   QUOTE I could check it (quickly) but I fear that I...   Jan 21 2005, 14:01
- - Gabriel   The q1 and q0 problem has now been identified and ...   Jan 22 2005, 19:11
- - Jebus   I know this is just one listening test, but would ...   Jan 26 2005, 00:11
|- - dev0   QUOTE (Jebus @ Jan 26 2005, 12:11 AM)I know t...   Feb 1 2005, 08:06
|- - [proxima]   guruboolez results about the new VBR mode are real...   Feb 1 2005, 22:49
|- - Jechdery   I am using 3.96.1 -V 2 rather than 3.90.3 aps for ...   Feb 2 2005, 23:27
- - ezra2323   Its been over a week with no news of any developme...   Feb 1 2005, 02:14
- - Wombat   After some reading it seems i finally found the th...   Nov 28 2005, 19:01
- - Wombat   I donīt know where to post this and i am waiting f...   Dec 1 2005, 00:55
- - robert   @wombat could you check 3.98a2 with the velvet.wav...   Dec 1 2005, 11:02
- - Wombat   Sure i will! As soon as i am home tonight.   Dec 1 2005, 11:17


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