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Re: about audacity and sound recording on Linux

On Mon, 2007-02-19 at 15:31 -0500, H.S. wrote:
> 1. If the input waveform seems to go beyond the +1 and -1 scale, what 
> does that signify? I assume that shows recording circuit is being 
> saturated and that the output from mixer should be reduced.

I think that's correct. "Any waveform that goes above 1.0 or below -1.0
will be clipped and will result in distortion." From

I have only dabbled a little bit with Audacity myself, so I could be
wrong of course. For these kind of non Debian specific questions, I
suggest you try the mailing lists and forums for Audacity itself.

> 3. On a machine, I exported a portion of the captured audio to a wav 
> file (basically, saved a portion of the input). I then transfered it to 
> my home computer running Debian. While that sound wave file was shown 
> between +1 and -1 in the original machine, on my home machine is was 
> being shown between +0.5 and -0.5 in audacity. What gives?

I think this is just an arbitrary value. You can zoom in and out to show
it in a different scale.

> In essence, I want to 
> call a script that converts all wav files in a directory to mp3 files. 
> And of course, I would like to be able to set the bitrate in the script. 
> Suggestions on which tool to use for this?

You will need the "lame" package from the unofficial Debian Multimedia
repository as Debian does not ship an mp3 encoder.

> 2. I can export to ogg format from audacity. Can I do the same thing as 
> (1) for this as well? Does ogg format support tags?

Yes, with oggenc from the vorbis-tools package. And yes, Ogg support

I suggest you use your favourite scripting language (Bash, Perl, Python
etc.) and write a small script for calling lame or oggenc and reading
the tags from a file. 


Sven Arvidsson
PGP Key ID 760BDD22

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