19 Feb
2007
19 Feb
'07
12:11 p.m.
Hello,
I just started to use audacity with some live recorded music. I have a
few starting questions:
Audacity:
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.
2. If the input waveform is being shown saturated, how would that
manifest itself in the playback?
3. On a machine, I exported a portion of the captured wav 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?
Exporting to mp3
1. I would like to export a number of wav files to mp3 files. Instead of
doing it one by one from audacity, how can I export them using a shell
script? I want to be able to set some basic tag info in a file and call
that file to fill in the mp3 tags automatically. 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?
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.
Thanks,
->HS
19 Feb
19 Feb
4:45 p.m.
1. I would like to export a number of wav files to mp3
files. Instead of
doing it one by one from audacity, how can I export them using a shell
script? I want to be able to set some basic tag info in a file and call
that file to fill in the mp3 tags automatically. 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?
with bash, the following onelines does the trick:
for filename in *.wav; do lame $filename `echo $filename | sed s/wav$/mp3/`; done
ofcourse you can use all lame command line options. man lame will tell you
all.
(if you are not familiar with it, this may look a bit cryptical, but there
is nothing to it. the backticks mean: evaluate the expression within.
and the expression says: echo $filename | sed s/wav$/mp3/, which means:
feed the filename to the regular-expression-based replacement, which replaces
'wav' at the end of the line ($) with 'mp3')
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.
almost the same with oggenc, except oggenc wants the output file with -o
for filename in *.wav; do oggenc -o `echo $filename | sed s/wav$/mp3/` $filename; done
note that the above will fail if your filenames contain spaces.
ls *.wav | while read filename;
instead of
for filename in *.wav
would deal with that.
but as always, there are many other ways to do the same thing. this is\
just how i would do it.
maarten
5:14 p.m.
New subject: [linux-audio-user] Re: Qs. about audacity and script to convert wav->mp3 or ogg
Maarten de Boer wrote:
Thanks. I am quite familiar with Bash scripting. I was only wanting to
get started on using the encoders in an automatic way.
I usually use quotes, e.g. for your command above:
$> for filename in *.wav; do oggenc -o `echo "$filename" | sed
s/wav$/mp3/` "$filename"; done
but the above is not tested though; I make the filename in a different
command and then call the file moving command, whatever that may be.
->HS
1. I would
like to export a number of wav files to mp3 files. Instead of
doing it one by one from audacity, how can I export them using a shell
script? I want to be able to set some basic tag info in a file and call
that file to fill in the mp3 tags automatically. 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?
with bash, the following onelines does the trick:
for filename in *.wav; do lame $filename `echo $filename | sed s/wav$/mp3/`; done
ofcourse you can use all lame command line options. man lame will tell you
all.
(if you are not familiar with it, this may look a bit cryptical, but there
is nothing to it. the backticks mean: evaluate the expression within.
and the expression says: echo $filename | sed s/wav$/mp3/, which means:
feed the filename to the regular-expression-based replacement, which replaces
'wav' at the end of the line ($) with 'mp3') 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.
almost the same with oggenc, except oggenc wants the output file with -o
for filename in *.wav; do oggenc -o `echo $filename | sed s/wav$/mp3/` $filename; done
note that the above will fail if your filenames contain spaces. ls *.wav | while read filename;
instead of
for filename in *.wav
would deal with that.
but as always, there are many other ways to do the same thing. this is\
just how i would do it.
maarten
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H.S. -
Maarten de Boer