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Subject: Re: [gentoo-user] Decreasing volume of an mp3 audio
From: Paul Hartman <paul.hartman+gentoo@gmail.com>
To: gentoo-user@lists.gentoo.org
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On Mon, Aug 24, 2009 at 12:32 PM, <meino.cramer@gmx.de> wrote:
> Hi,
>
>  is there an application, which is able to physically decrease
>  the volume level of an mp3 with as less as possible loss of
>  sound quality.
>  (Background: I am merging video parts done with my webcam
>  with sound trailers. Volume of the webcam's mics and
>  the volume of the mp3 should be not too different.)

As Volker said, I think normalize will do the trick. It can normalize
a batch of sound files so their volume level is the same. I would,
however, suggest you decompress the MP3 into a lossless file, that way
you aren't re-encoding and reducing sound quality further.

Also, your video editing software may be able to adjust the volume of
the individual audio tracks. Kdenlive, for example, has a normalize
audio track filter.