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Old 01-03-2005, 06:47 PM   #1
lemuel
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how do i compress an existing mp3 from 128 bit to 32 bit?


I have lame and sox installed. can I use them to compress an existing mp3 from 128 bit to 32 bit? how do I do that?

If its not possible, what software do I need?
 
Old 01-03-2005, 08:40 PM   #2
wapcaplet
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I don't know if it's necessary to convert to .wav first, but you can do so with sox like this:

Code:
sox -t wav -r 44100 -w -c 2 file.mp3 file.wav
You can maybe omit all the options, but those will give you a standard CD-ready .wav file. Then use lame to convert back to .mp3:

Code:
lame -b 32 file.wav file_32.mp3
Check the lame manual page ('man lame') for more options. You could probably tweak the quality settings to get better output, and unless the file actually needs to be a constant 32kbits/sec, you could probably use variable bitrate (-vbr option to lame) to get a little better quality with about the same file size.
 
Old 01-03-2005, 08:59 PM   #3
lemuel
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thanks for the info wapcaplet.

is it possible to convert to wav all the mp3s in a directory all at one command?

is it also possible to compress it directly without having to convert it wav?
 
Old 01-04-2005, 03:54 PM   #4
wapcaplet
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Sure enough, I just looked at the lame man page, and it has an option --mp3input, which says is for downsampling an existing mp3. So you're in luck!

Here's a way you can encode a bunch of files at once. Say you want to convert all the mp3s in the current directory, and put the new files in ./compressed. You'd do something like this:

Code:
mkdir ./compressed
for file in *.mp3; do lame --mp3input -b 32 "$file" "./compressed/$file"; done
(The double-quotes are to prevent problems with filenames containing spaces. If your filenames don't have spaces, you can leave the double-quotes out)
 
Old 01-04-2005, 08:28 PM   #5
lemuel
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ok i got it!

thanks abunch for your help!
 
  


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