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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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Gabriel
post Jan 17 2005, 10:41
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Explanations regarding the current ATH status:

It seems clear that there is an important point regarding ath in current version. Ath is configured by 2 elements in 3.97: the level and the shape.

In 3.97a6, the base level for abr/cbr 128k is -3 (ie similar to --athlower 3), and the shape is 4.
The shape is in fact controlling the upper freqs slope of the ath. It is controlled by --athshape xx.
A value of 10 leads to the old Painter&Spanias curve, and a value of 1 leads (nearly) to the Klemm ath.

Changing the base ath level has some impact on every freq, while changing the shape is impacting high freqs.
Of course, if we only change the base level to solve a problem only present in high freqs, we will be wasting bits on low/mid freqs.
A tradeoff must be found.

Another thing that can have some influence could be the ath automatic adjustement. I think that I will soon enable it for abr/cbr.
note: regarding ath params, it would be helpfull to know the RG value computed by Lame for the tested samples.

Curious people can check the default ath settings there:
http://cvs.sourceforge.net/viewcvs.py/lame...s.c?view=markup
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[proxima]
post Jan 17 2005, 13:05
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QUOTE (Gabriel @ Jan 17 2005, 10:41 AM)
The shape is in fact controlling the upper freqs slope of the ath. It is controlled by --athshape xx.
*

This switch is unrecognized with 3.97a6.
What does the xx numbers mean? Maybe a sort of rolloff like mppenc ?
The explanation you give us about the level and the shape is very reasonable.. maybe enabling athaa for cbr/abr can also solve the problem of wasted bits, at least this already happened with VBR.


--------------------
WavPack 4.3 -mfx5
LAME 3.97 -V5 --vbr-new --athaa-sensitivity 1
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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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