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

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-normalization-ebu-r128-calm-act/),
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:
> Hi
>
> I play keyboards in a couple of bands. When setting up my sounds I often
> find that on some songs my keyboard is much louder than on others. I'm
> pretty sure it's because to the extremely mixed level of the mp3 files I
> use for rehearsing and programming the synth sounds.
>
> So my question is: how can I match the levels of the mp3 files so that
> they will playback in levels "as close as possible to the level a my
> band plays them"? I imagine a ballad would be played back at lower level
> than a power rock tune, not sure if there's a way to compensate for
> that, though. So at least something that sounds like the same level.
>
> NB: The tunes vary a great deal in audio quality and
> loudness-war-compression (some are new dance/pop tunes, some are old
> soul tunes, some are something else).
>
> Thanks in advance for any input!
>

-- 
auphonic - automatic audio post production
http://auphonic.com
audio development, machine learning, open source and more
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