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
http://www.guidesandtutorials.com/audacity-tracks.html

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.
http://debian-multimedia.org/

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
tags.

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.

HTH,

--
Cheers,
Sven Arvidsson
http://www.whiz.se
PGP Key ID 760BDD22

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