[LAU] question about normalize-audio

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To: <linux-audio-user@...>
Cc: <chrisvaill@...>
Date: Friday, July 22, 2011 - 4:15 am

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After a lot of experimenting over many years, I am at a loss for how I can achieve the following (without lots of "painful experimentation"):

* normalize the RMS volume of a group of samples
* max value of the loudest peak in the group doesn't exceed xxx db
* no limiting/clipping/compression

Imagine a (non-existent) command line such as:

$ normalize-audio --rms --max-peak=xxxdb --as-lossless-as-possible

note that with normalize-audio 0.7.7:

$ normalize-audio --peak --no-adjust
$ normalize-audio --no-adjust

result in exactly the same output:

level peak gain
-44.9045dBFS -26.6550dBFS 32.9045dB china-22in_zildjian-1.wav
-36.0490dBFS -18.3966dBFS 24.0490dB china-22in_zildjian-2.wav
-33.1798dBFS -14.9723dBFS 21.1798dB china-22in_zildjian-3.wav
-25.6555dBFS -5.5081dBFS 13.6555dB china-22in_zildjian-4.wav
-18.4676dBFS -1.4021dBFS 6.4676dB china-22in_zildjian-5.wav
-17.8024dBFS -0.0540dBFS 5.8024dB china-22in_zildjian-6.wav
In this case, the file with a peak of -0.054db is adjusted by +5.8db in both cases, resulting in clipping/limiting etc.

Shane Richards
Producer, Composer, Multi-instrumentalist
Josh Music
shanerich@email.com
www.josh.com.co
www.shanerichardsmusic.com

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After a =
lot of experimenting over many years, I am at a loss for how I can achieve =
the following (without lots of "painful experimentation"):=20
=20
* normalize the RMS volume of a group of samples=20
* max value of the loudest peak in the group doesn't exceed  xxx db=20
* no limiting/clipping/compression=20
=20
=20
Imagine a (non-existent) command line such as:=20
=20
$ normalize-audio --rms --max-peak=3Dxxxdb --as-lossless-as-possible=
=20
=20
=20
note that with normalize-audio 0.7.7:=20
=20
$ normalize-audio --peak --no-adjust=20
$ normalize-audio  --no-adjust=20
=20
result in exactly the same output:=20
=20
=20
  level        peak         g=
ain                     &=
nbsp;                    =
                    &nbs=
p;                     &n=
bsp;                     =
    =20
=20
-44.9045dBFS -26.6550dBFS 32.9045dB  china-22in_zildjian-1.wav  =
                    &nbs=
p;                     &n=
bsp;                     =
              =20
=20
-36.0490dBFS -18.3966dBFS 24.0490dB  china-22in_zildjian-2.wav  =
                    &nbs=
p;                     &n=
bsp;                     =
              =20
=20
-33.1798dBFS -14.9723dBFS 21.1798dB  china-22in_zildjian-3.wav  =
                    &nbs=
p;                     &n=
bsp;                     =
              =20
=20
-25.6555dBFS -5.5081dBFS  13.6555dB  china-22in_zildjian-4.wav &=
nbsp;                    =
                    &nbs=
p;                     &n=
bsp;               =20
=20
-18.4676dBFS -1.4021dBFS  6.4676dB   china-22in_zildjian-5.wav &=
nbsp;                    =
                    &nbs=
p;                     &n=
bsp;               =20
=20
-17.8024dBFS -0.0540dBFS  5.8024dB   china-22in_zildjian-6.wav=20
=20
In this case, the file with a peak of -0.054db is adjusted by +5.8db in bot=
h cases, resulting in clipping/limiting etc.=20
=20
=20
=20
Shane Richards=20
=20
Producer, Composer, Multi-instrumenta=
list=20
=20
Josh Music=20
=20
shanerich@email.com=
=20
=20
www.josh.com.co=20
=20
www.shanerichardsmusic.com=
=20

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Messages in current thread:
[LAU] question about normalize-audio, shane richards, (Fri Jul 22, 4:15 am)
Re: [LAU] question about normalize-audio, Paul Davis, (Fri Jul 22, 12:18 pm)