[linux-audio-user] Re: Qs. about audacity and script to convert wav->mp3 or ogg

[H.S.]

Maarten de Boer wrote:
>> 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')

Thanks. I am quite familiar with Bash scripting. I was only wanting to 
get started on using the encoders in an automatic way.


>> 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. 

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



> 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
> 
>