A tool for auto amplifying of wav/flac files.
 

El Thursday 04 February 2010 13:26:55 Sthu Deus va escriure:
> Good day.

Hello,

> Is there a tool by which, I can amplify gain to 0 db of every wav/flac

There's "normalize-audio" that might help.

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Marc Olivé
Grup Blau

marc.olive@grupblau.com


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A tool for auto amplifying of wav/flac files.
 

Marc Olive on 04/02/10 13:00, wrote:

El Thursday 04 February 2010 13:26:55 Sthu Deus va escriure:

Good day.


Hello,


Is there a tool by which, I can amplify gain to 0 db of every wav/flac


There's "normalize-audio" that might help.


It depends on what he means by "amplify gain to 0 db". Maybe I'm ignorant, but
what effect does that have?


Actually since I am displaying my ignorance already, I might as well as some
stupid questions about normalize that I never worked out.


I know if I rip a CD and normalize it in the process, all the songs get set to
the same volume.


Since I normally let my music player shuffle through my whole collection, I want
all my music to be the same volume. So when I'm ripping to different CDs, how do
tell normalize-audio that I want the same volume on each?


How does normalize-audio know that one cd is the sound of pins dropping but the
next cd is elephants charging? I mean, I don't want those cds to be literally
the same volume, I want them to keep their relative volume difference, but just
to adjust the absolute level to a standard.


Or is that some Holy Grail that you can't do?



Adam


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A tool for auto amplifying of wav/flac files.
 

On Thu, 2010-02-04 at 16:22 +0100, Klistvud wrote:
> Dne, 04. 02. 2010 14:57:37 je Adam Hardy napisal(a):
> >
> > How does normalize-audio know that one cd is the sound of pins
> > dropping but the next cd is elephants charging? I mean, I don't want
> > those cds to be literally the same volume, I want them to keep their
> > relative volume difference, but just to adjust the absolute level to
> > a standard.
> >
> > Or is that some Holy Grail that you can't do?
>
> Common sense tells me that any software that wants to normalize audio
> levels, must probably scan the entire sound clip, find the loudest
> passage within the clip, and set that passage to the reference 0 db
> loudness. All the other passages in the clip just get set to an
> accordingly lower level, and that's that. The same goes for entire CDs:
> you find the loudest signal in the entire CD, and then proceed
> accordingly.

FWIW, the replaygain algorithm uses a more advanced psycho-acoustic
model to determine loudness than just "maximum amplitude".

I know you are talking about .wav and .flac, but I've used:

mp3gain
vorbisgain

for normalizing the respective audio files. Both of those packages use
the replaygain algorithm.

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Matt Zagrabelny - mzagrabe@d.umn.edu - (218) 726 8844
University of Minnesota Duluth
Information Technology Systems & Services
PGP key 4096R/42A00942 2009-12-16
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He is not a fool who gives up what he cannot keep to gain what he cannot
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A tool for auto amplifying of wav/flac files.
 

>
>
>
>---- Original Message ----
>From: marc.olive@grupblau.com
>To: debian-user@lists.debian.org
>Subject: Re: A tool for auto amplifying of wav/flac files.
>Date: Thu, 4 Feb 2010 14:00:27 +0100
>
>>El Thursday 04 February 2010 13:26:55 Sthu Deus va escriure:
>>> Good day.
>>
>> Hello,
>>
>>> Is there a tool by which, I can amplify gain to 0 db of every
>wav/flac
>>
>> There's "normalize-audio" that might help.
>>
>>--
>>
>>Marc Olivé
>>Grup Blau
>>
>>marc.olive@grupblau.com
>>
>>
Before you go trying tools it may be useful to ask your self what you
are trying to accomplish. As others have pointed out in a similar
thread the term db is a ratio. As a result 0db means "the same as".
In your instance what is the other variable to which you would like
to match the volume?
Larry
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>>with a subject of "unsubscribe". Trouble?
Contact listmaster@lists.debian.org
>>
>>



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A tool for auto amplifying of wav/flac files.
 

Dne, 04. 02. 2010 14:57:37 je Adam Hardy napisal(a):


How does normalize-audio know that one cd is the sound of pins
dropping but the next cd is elephants charging? I mean, I don't want
those cds to be literally the same volume, I want them to keep their
relative volume difference, but just to adjust the absolute level to
a standard.


Or is that some Holy Grail that you can't do?


Common sense tells me that any software that wants to normalize audio
levels, must probably scan the entire sound clip, find the loudest
passage within the clip, and set that passage to the reference 0 db
loudness. All the other passages in the clip just get set to an
accordingly lower level, and that's that. The same goes for entire CDs:
you find the loudest signal in the entire CD, and then proceed
accordingly.


Or something along that line.

--
Regards,

Klistvud
Certifiable Loonix User #481801
http://bufferoverflow.tiddlyspot.com


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A tool for auto amplifying of wav/flac files.
 

Matt Zagrabelny:
>
> FWIW, the replaygain algorithm uses a more advanced psycho-acoustic
> model to determine loudness than just "maximum amplitude".

ACK, and it should be preferred to "dumb" normalization if possible.

> I know you are talking about .wav and .flac, but I've used:
>
> mp3gain
> vorbisgain

For FLAC there is metaflac --add-replay-gain.

J.
--
In public I try to remain calm and to appear perceptive.
[Agree] [Disagree]
<http://www.slowlydownward.com/NODATA/data_enter2.html>

A tool for auto amplifying of wav/flac files.
 

>On Thu, Feb 4, 2010 at 8:40 AM, Jochen Schulz <ml@well-adjusted.de> wrote:

>Matt Zagrabelny:

>>

>> FWIW, the replaygain algorithm uses a more advanced psycho-acoustic

>> model to determine loudness than just "maximum amplitude".

>

>ACK, and it should be preferred to "dumb" normalization if possible.

>

>> I know you are talking about .wav and .flac, but I've used:

>>

>> mp3gain
>> vorbisgain

>

>For FLAC there is metaflac --add-replay-gain.

Jochen and Matt have it right. *Also, since you didn't ask, I'd suggest getting those wav files transcoded to flac too. *:)


Mark

A tool for auto amplifying of wav/flac files.
 

Thank You for Your time and answer, owens@netptc.net:

>Before you go trying tools it may be useful to ask your self what you
>are trying to accomplish. As others have pointed out in a similar
>thread the term db is a ratio.

Not correct. The "0 db" is the sound level - meaning "the highest" w/o any undesired effects. Therefore, what I want to accomplish is to put the level up on a bunch of flac/wav.


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A tool for auto amplifying of wav/flac files.
 

Thank You for Your time and answer, Jochen:

>For FLAC there is metaflac --add-replay-gain.

Can You help me w/ its usage. I tried this way (running in the flacs dir.):

$ metaflac --add-replay-gain 001.flac 002.flac 003.flac

- it just hangs to me.


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A tool for auto amplifying of wav/flac files.
 

owens writes:
> Before you go trying tools it may be useful to ask your self what you
> are trying to accomplish. As others have pointed out in a similar
> thread the term db is a ratio.

Sthu Deus writes:
> Not correct.

It is ten times the base ten log of the ratio of two power levels. Thus
3 db signifies a power ratio of 10^(.3) or approximately two.

> The "0 db" is the sound level - meaning "the highest" w/o any
> undesired effects.

In acoustics "0 db" is the threshold of hearing. Sound power is
measured in db with this as the reference level.
--
John Hasler


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