[gentoo-user] Decreasing volume of an mp3 audio

[gentoo-user] Decreasing volume of an mp3 audio

[meino.cramer]

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.)

 Thank you very much for any help in advance !
 Best regards
 ]|[cc



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Re: [gentoo-user] Decreasing volume of an mp3 audio

[Volker Armin Hemmann]

On Montag 24 August 2009, 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.)
>
>  Thank you very much for any help in advance !
>  Best regards
>  ]|[cc

maybe this is the thing you are looking for:


* media-sound/normalize
     Available versions:  0.7.7 {audiofile mad nls userland_BSD}
     Homepage:            http://normalize.nongnu.org/
     Description:         Audio file volume normalizer

?

[gentoo-user] Re: Decreasing volume of an mp3 audio

[Francesco Talamona]

On Monday 24 August 2009, Volker Armin Hemmann wrote:
> On Montag 24 August 2009, 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.)
> >
> >  Thank you very much for any help in advance !
> >  Best regards
> >  ]|[cc
>
> maybe this is the thing you are looking for:
>
>
> * media-sound/normalize
>      Available versions:  0.7.7 {audiofile mad nls userland_BSD}
>      Homepage:            http://normalize.nongnu.org/
>      Description:         Audio file volume normalizer
>
> ?

Also media-sound/mp3gain does the trick

Ciao
	Francesco

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[gentoo-user] Re: Decreasing volume of an mp3 audio

[Nikos Chantziaras]

On 08/24/2009 08:32 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.

Unfortunately, no. There's no way to do that since the mp3 format does 
not support any kind of "volume" meta information.

The only way to get lossless volume change is to use "Replay Gain", a 
method that inserts volume alteration information inside the mp3's ID 
tags.  However, the player that will then play back the mp3 must support 
Replay Gain.

[gentoo-user] Re: Decreasing volume of an mp3 audio

[Nikos Chantziaras]

On 08/24/2009 09:35 PM, Nikos Chantziaras wrote:
> On 08/24/2009 08:32 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.
>
> Unfortunately, no.

It seems I was wrong:

http://en.wikipedia.org/wiki/Mp3gain

This program can alter volume without re-encoding.  And the process is 
fully reversible two.

Re: [gentoo-user] Re: Decreasing volume of an mp3 audio

[meino.cramer]

Nikos Chantziaras <realnc@arcor.de> [09-08-27 04:29]:
> On 08/24/2009 09:35 PM, Nikos Chantziaras wrote:
> >On 08/24/2009 08:32 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.
> >
> >Unfortunately, no.
> 
> It seems I was wrong:
> 
> http://en.wikipedia.org/wiki/Mp3gain
> 
> This program can alter volume without re-encoding.  And the process is 
> fully reversible two.
> 

Hi Nikos !

THAT is exactly what I have searched for ! :)

GREAT! Thank you very much!!!

Have a nice weekend!
Best regards
mcc


-- 
Please don't send me any Word- or Powerpoint-Attachments
unless it's absolutely neccessary. - Send simply Text.
See http://www.gnu.org/philosophy/no-word-attachments.html
In a world without fences and walls nobody needs gates and windows.

Re: [gentoo-user] Decreasing volume of an mp3 audio

[Paul Hartman]

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.