I need to know the average volume of an mp3 file so that when I convert it to mp3 (at a different bitrate) I can scale the volume too, to normalize it...
Therefore I need a command line tool / ruby library that gives me the average volume in dB.
+1
A:
You can use LAME to encode to mp3. It has options for normalization, scaling, and bitrate. LAME also compiles to virtually any platform.
Kekoa
2009-06-16 19:25:53
lame does the scaling, but does it normalize?? I mean, can it evaluate the average volume per track? If so, how? I read the man and couldn't work it out...
luca
2009-06-16 19:40:58
+2
A:
You can use sox (an open source command line audio tool http://sox.sourceforge.net/sox.html) to normalize and transcode your files at the same time.
EDIT
Looks like it doesn't have options for bit-rate. Anyway, sox is probably overkill if LAME does normalization.
steamer25
2009-06-16 19:30:29
A:
http://mp3gain.sourceforge.net/ is a well thought out solution for this.
James Roth
2010-05-14 20:56:13