Hi
I find myself in the need of batch normalizing a lot of wav files (44.1kHz, 24bits) to "-1db peak". I don't know much about the technical details, although I seem to understand that "-1db" is not as simple as that. I looked to the command line tool normalize-audio and got quite confused. In reaper I exported files with the rendering meter maxing at -1, I assume this is the correct target gain. However if I just run normalize-audio on the resulting file I get this:
atte@pandrup:~/downloads/normalize_test/test$ normalize-audio 0db.wav
Computing levels...
0db.wav 100% done, ETA 00:00:00 (batch 100% done, ETA 00:00:00)
Applying adjustment of 4.02dB to 0db.wav...
0db.wav 100% done, ETA 00:00:00 (batch 100% done, ETA 00:00:00)
So it seems that there's room for 4db of gain, which I find odd, as I expeced the reaper render to be at -1db. So I looked at the manual, and found the --amplitude option:
atte@pandrup:~/downloads/normalize_test/test$ normalize-audio --amplitude=1db 0db.wav
normalize-audio: normalizing to -1.000000 dBFS
Computing levels...
0db.wav 100% done, ETA 00:00:00 (batch 100% done, ETA 00:00:00)
Applying adjustment of 15.02dB to 0db.wav...
0db.wav 100% done, ETA 00:00:00 (batch 100% done, ETA 00:00:00)
Looking at the waveform it now looks clipped. Total confusion here...
What is generally meant by "-1db peak", and is there a way to normalize a wav to "-1 db peak" on the command line.
NB: First post here after switching to gmail, hope post goes through...
-- Atte
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