[LAU] question about normalize-audio

shane richards shanerich at email.com
Fri Jul 22 04:15:20 UTC 2011


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 at email.com
www.josh.com.co
www.shanerichardsmusic.com
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