best tool for batch normalizing mp3

[BDub]

I want to normalize a large collection of mp3 files.
What's the best (preferably free) tool for this ?
Thanks.

 

[Febs]

mp3gain

Or, Foobar/Replaygain. However, this will be effective only if your player supports Replaygain tags, whereas mp3gain will change the mp3s themselves so that the volume change is effective on any player.

 

[Digitalbath3737]

I second mp3gain. Works any player. The change is reversible as well.

 

[BDub]

I knew you guys would come through.
Much obliged!

 

[BDub]

Just FYI:
I found these free normalizing and crossfading plugins for Winamp.
http://www.sqrsoft.com.ar/en/index.html

Quote:

SqrSoft Limiter This DSP is useful for normalizing the sound level, use this with your SqrSoft ACF. Download SqrSoft Limiter v2.0 SqrSoft Advanced Crossfading Output SqrSoft Advanced Crossfading Output A fast & intelligent crossfading output module, perfect for radios, parties or what you want! Download SqrSoft Advanced Crossfading v1.75 (Multilanguage)

 

[gp_hebert]

foobar2000 with ReplayGain is great if you use an mp3 player with Rockbox.

 

[slydog64]

hmm, let me see how long this takes to run on 14,000 songs.

 

[grndslm]

I love open source software!!!

I've tried using gnormalize on ubuntu, but I couldn't get it to work even after installing other dependencies and linking normalize to normalize-audio or whatever it was...

However, this mp3gain is in the Ubuntu repositories so all I had to do was type this command and.. BAM, i had it:

sudo aptitude install mp3gain

Then I went to my music directory:

cd music ... or cd ~/music if you've lost your way

Then I started this commmand:

find . -type f -iname '*.mp3' -print0 | xargs -0 mp3gain -r -k -p

....it seems to be normalizing approximately 5~7 songs in a minute on an
model name : AMD Athlon(TM) XP 1600+
cpu MHz : 1396.698

O, I love the command line!

 

[slydog64]

it took about 11 hours to do 14,000 songs on a Core 2 Duo 2.13 with 2 gigs of ram

 

[Gene Smith]

Mp3Gain does not work on "any" player.  For example: "PlayIt Live" does not respect the gain tag.  But, if you plan on only using a player that DOES use the gain tag, then Mp3Gain is the way to go.