Re: [LAU] keeping same perceived level on mp3 files

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To: <linux-audio-user@...>
Date: Friday, October 5, 2012 - 5:12 pm

Hallo!

Do you just want to adjust the loudness between multiple files?
(this means there is just a constant gain for every file so the they are
similar on average)
Or do you also want to change the loudness inside one track?

For case 1, you have to measure the loudness somehow (best way would be
to use a loudness standard like used in EBU R128 - see
https://auphonic.com/blog/2012/08/02/loudness-measurement-and-normalizat...),
and then you apply a constant gain, combined with a limiter (and maybe
compressor) if the gain is positive.

For case 2, it's more complex ;)

BTW:
we build an audio processing webservice (http://auphonic.com), which
does both cases, for case 1 just use the "global loudness normalization"
algorithm, for case 2 use the "adaptive leveler" too!

For case 1 you could also use libebur128 (or some other tools) to
measure the loudness, then apply a gain and limiter somehow ...

LG
Georg

Am 2012-10-05 18:30, schrieb Atte André Jensen:

--
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http://auphonic.com
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Messages in current thread:
[LAU] keeping same perceived level on mp3 files, Atte André Jensen, (Fri Oct 5, 4:30 pm)
Re: [LAU] keeping same perceived level on mp3 files, Georg Holzmann, (Fri Oct 5, 5:12 pm)
Re: [LAU] keeping same perceived level on mp3 files, Fons Adriaensen, (Fri Oct 5, 7:13 pm)
Re: [LAU] keeping same perceived level on mp3 files, Atte André Jensen, (Sat Oct 6, 11:08 am)
Re: [LAU] keeping same perceived level on mp3 files, Fons Adriaensen, (Sat Oct 6, 12:55 pm)
Re: [LAU] keeping same perceived level on mp3 files, Georg Holzmann, (Sat Oct 6, 11:51 am)
Re: [LAU] keeping same perceived level on mp3 files, Atte André Jensen, (Sun Oct 7, 6:56 pm)
Re: [LAU] keeping same perceived level on mp3 files, Fons Adriaensen, (Sun Oct 7, 10:30 pm)
Re: [LAU] keeping same perceived level on mp3 files, Atte André Jensen, (Mon Oct 8, 6:19 am)
Re: [LAU] keeping same perceived level on mp3 files, Fons Adriaensen, (Mon Oct 8, 8:21 pm)
Re: [LAU] keeping same perceived level on mp3 files, Atte André Jensen, (Mon Oct 8, 6:01 pm)
Re: [LAU] keeping same perceived level on mp3 files, Fons Adriaensen, (Sun Oct 7, 9:34 pm)