Re: [Toolame-devel] Mp2 in a .wav file format and parallel encoding

[Jesse S. <sc...@gm...>]

I've been having lots of problems with noise in my output. see below.

Snip, snip


> 
> Batch converting is trivially simple on Linux -- it just takes a little shell
> scripting.  Something like:
> 
> #!/bin/bash
> for i in /some_dir/*.wav;
>   do toolame -m s -b 256 "$i";
> done

I did quite a bit of expirimentation last night (I actualy got past
research and started building ) but I could not output an acceptable
quality file.

I grabbed libmad (a high quality decoder ???) and libmad-dev with my
friendly apt-get, I also grabbed madllb  which should output pcm from
a .wav file.  The problem was that though I could create an acceptable
sounding .aiff file with madlld and sox, I could not do the same with
toolame and your patch (didnt' try without your patch).

Generating the .aiff file with madlld
./madlld < This_land_is_your_land.mp2 |sox -r 44100 -t cdr - test.aiff 
madlld: 256000 kb/s audio MPEG layer II stream without CRC, normal LR
stereo with no emphasis at 44100 Hz sample rate
madlld: end of input stream
madlld: 7299 frames decoded (3:10.667).


Various toolame attempts

./madlld <This_land_is_your_land.mp2| toolame -t 2 -p 2 -v 10 -s 44.1
-e -b 256 -W  - out.mp2
--------------------------------------------
Input File : 'stdin'   44.1 kHz
Output File: 'out.mp2'
256 kbps MPEG-1 Layer II stereo Psycho model=2  (Mode_Extension=0)
[De-emph:Off    Copyright:No    Original:No     CRC:On]
[Padding:Off    Byte-swap:Off   Chanswap:Off    DAB:Off]
VBR Enabled. Using MNR boost of 10.000000
ATH adjustment 0.000000
--------------------------------------------
encode_init: using tablenum 1 with sblimit 30
madlld: 256000 kb/s audio MPEG layer II stream without CRC, normal LR
stereo with no emphasis at 44100 Hz sample rate
absthr[][] sampling frequency index: 1
madlld: end of input stream
madlld: 7299 frames decoded (3:10.667).
Hit end of audio data
VBR stats:
  32   48   56   64   80   96  112  128  160  192  224  256  320  384 
   0    0    0    0    0    0    0    0    0   52  116   67 7064    0 
Avg slots/frame = 1034.129; b/smp = 7.18; bitrate = 316.702 kbps

Done

toolame -b 256  test.aiff outMP2.mp2
>>> Using Audio IFF sound file headers
Parsing AIFF audio file 
>>> 44100.000000 Hz sampling frequency selected
--------------------------------------------
Input File : 'test.aiff'   44.1 kHz
Output File: 'outMP2.mp2'
256 kbps MPEG-1 Layer II j-stereo Psy model 1 
[De-emph:Off    Copyright:No    Original:No     CRC:Off]
[Padding:Normal Byte-swap:Off   Chanswap:Off    DAB:Off]
ATH adjustment 0.000000
--------------------------------------------
encode_init: using tablenum 1 with sblimit 30
[2200]]
Hit end of audio data
Avg slots/frame = 835.918; b/smp = 5.80; bitrate = 256.000 kbps

Done