Any Linux command line prog (for batches) to change DYNAMIC RANGE of MP3's?

[FormerDittoHead]

I'm not talking normalization, I'm talking recording where people are practically whispering and then SHOUTING, so I don't have to turn my sound up and down... (do you HEAR ME, Mike Malloy?)

There is a Windows program called MP3doctor which does the trick, but I currently have a bash file which downloads my podcasts, splits them up nicely into 20 minute parts, then change their ID3 tags.

I'd LOVE to be able to add a "dynamic range" adjustment too.

I've checked out "ecasound" but I can't figure it out....

Anyone here have any experience doing this?

[charlie]

1. Can't make a recommendation

But I did find this:

http://www.conversationsnetwork.org/levelator

Not a command line program, unfortunately, but I thought I'd point it out in case you don't find another app that's suitable.

If you're not already, the search term you want to be using is "limiter", which is often paired with or used in place of "compressor." Here's what Google brings up:

http://www.google.com/search?num=20&hl=en&safe=off&q=sound+compressor+limiter+linux

[SecularMotion]

2. Lame

Lame is the basic program most linux mp3 converters use. There are many options I haven't tried. If you are playing mp3s on Linux there is a good chance you have it already. Try "man lame" for options.

[FormerDittoHead]

3. I don't see any applicable options in lame - what were you suggesting I do with lame?

I'm taking existing mp3 files (Mike Malloy podcasts) and I want to compress their dynamic volume range to I don't have to turn the volume up when he's practically whispering and down when he's shouting.

Which one of these options for lame (or family of options) would bring up the volume in the quiet passages and also lower the volume in the SHOUTING parts?

I'm not looking to raise or lower the volume of the whole mp3.

check this out - this is what I want to do:
http://www.mp3doctor.com/normalize.htm

"Sometimes, in the same song , there are important differences in the volume , as in one of its parts there is a very low volume while in other or others there is a correct or loud volume . In this case the classical function normalize mp3, present in most of the programmes that have normalize mp3, is not useful .

Mp3 Doctor, on the contrary, makes the volume of a Mp3 to become excellent, so that none of its parts have low volume It is really amazing , to hear how the Mp3 Doctor is capable of harmonizing the volume of every part of a Mp3 ."

[RoyGBiv]

4. mp3gain ...

Here's a link to the source and several pre-compiled packages.

http://ftp.riken.go.jp/pub/Linux/debian/debian/pool/main/m/mp3gain/

If you want to read the man page, it has several options. As for batches, since it's a command line program, you just set it up running within a short script.

Or, here's a suggested command string (from a forum, not me) that would normalize an entire directory:

find /path/to/mp3/directory -type d -exec sh -c "cd \"{}\" && mp3gain -r -T *.mp3"

[FormerDittoHead]

5. I have that already installed. I check that command out... n/t