Lame3.98 bad pre-echo in V0 and b320

2008-08-10 18:11:47

/Edit: maybe this is more suitable for the Tech forum?/

Sample link http://www.volny.cz/jmartis/latenight.flac

Lame version: 3.98 final

Problem: Pre-echo artifact with -V0 and -b320 settings and any other presets, very easily noticable. Its not as bad with 3.97b3.

ABX 10/10 on both settings, I only need to play the "X" as the problem is really obvious.

Code: [Select]

WinABX v0.42 test report
08/10/2008 19:00:21

A file: X:\AUDIO\mp3 testcases\latenight.wav
B file: X:\AUDIO\mp3 testcases\latenight320.wav

Start position 00:00.0, end position 00:05.1
19:01:13    1/1  p=50.0%
19:01:18    2/2  p=25.0%
19:01:23    3/3  p=12.5%
19:01:27    4/4  p=6.2%
19:01:31    5/5  p=3.1%
19:01:36    6/6  p=1.6%
19:01:39    7/7  p=0.8%
19:01:42    8/8  p=0.4%
19:01:45    9/9  p=0.2%
19:01:49  10/10  p< 0.1%



WinABX v0.42 test report
08/10/2008 19:02:38

A file: X:\AUDIO\mp3 testcases\latenightV0.wav
B file: X:\AUDIO\mp3 testcases\latenight.wav

19:02:44    1/1  p=50.0%
19:02:47    2/2  p=25.0%
19:02:51    3/3  p=12.5%
19:02:54    4/4  p=6.2%
19:02:56    5/5  p=3.1%
19:03:00    6/6  p=1.6%
19:03:03    7/7  p=0.8%
19:03:06    8/8  p=0.4%
19:03:09    9/9  p=0.2%
19:03:12  10/10  p< 0.1%

Lame3.98 bad pre-echo in V0 and b320

Reply #1 – 2008-08-10 19:35:31

Have you tried to use NSPSY instead of the new psy model thats default with the -V switches?. There was a option on a beta version that would let a user use a different psy model, but its not documented or has been removed on the final version. Anyway --vbr-old, still uses npsytune as the the default psy model.

Code: [Select]

C:\Downloads\lame3.98>lame -V 2 C:\Temp\Transcodes\latenight.wav C:\Temp\latenig
htV2.mp3
LAME 3.98 32bits (http://www.mp3dev.org/)
CPU features: MMX (ASM used), SSE (ASM used), SSE2
Using polyphase lowpass filter, transition band: 18671 Hz - 19205 Hz
Encoding C:\Temp\Transcodes\latenight.wav to C:\Temp\latenightV2.mp3
Encoding as 44.1 kHz j-stereo MPEG-1 Layer III VBR(q=2)
    Frame          |  CPU time/estim | REAL time/estim | play/CPU |    ETA
   201/201   (100%)|    0:00/    0:00|    0:00/    0:00|   30.705x|    0:00
 32 [  1] **
 40 [  0]
 48 [  0]
 56 [  0]
 64 [  0]
 80 [  1] **
 96 [  1] **
112 [  0]
128 [  6] *******
160 [ 65] %%%%%%%%%%%**********************************************************
192 [ 60] %%%%%%%%%%%%%%%%%%%%%%%%%***************************************
224 [ 18] %%%%%%%%%***********
256 [ 26] %%%%%%%%%%%*****************
320 [ 23] %%%%%%%%%%%**************
-------------------------------------------------------------------------------
   kbps        LR    MS  %     long switch short %
  203.7       30.3  69.7        55.5  20.9  23.6
Writing LAME Tag...done
ReplayGain: -7.0dB

C:\Downloads\lame3.98>lame -V 2 --vbr-old C:\Temp\Transcodes\latenight.wav C:\Te
mp\latenightV2vbrold.mp3
LAME 3.98 32bits (http://www.mp3dev.org/)
CPU features: MMX (ASM used), SSE (ASM used), SSE2
Using polyphase lowpass filter, transition band: 18671 Hz - 19205 Hz
Encoding C:\Temp\Transcodes\latenight.wav to C:\Temp\latenightV2vbrold.mp3
Encoding as 44.1 kHz j-stereo MPEG-1 Layer III VBR(q=2) qval=3
    Frame          |  CPU time/estim | REAL time/estim | play/CPU |    ETA
   201/201   (100%)|    0:00/    0:00|    0:00/    0:00|   13.463x|    0:00
 32 [  1] *
 40 [  0]
 48 [  0]
 56 [  0]
 64 [  1] *
 80 [  1] *
 96 [  0]
112 [  0]
128 [ 16] ***********
160 [106] %%%%%%%%%%%%%%%******************************************************
192 [ 44] %%%%%%%%%%%%%****************
224 [ 13] *********
256 [ 15] **********
320 [  4] ***
-------------------------------------------------------------------------------
   kbps        LR    MS  %     long switch short %
  177.4       20.4  79.6        66.2  18.4  15.4
Writing LAME Tag...done
ReplayGain: -7.0dB

C:\Downloads\lame3.98>

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