Batch convert Asterisk GSM WAV files to mp3


I am working on a fun project at work to provide web based visual voice-mail for a ticketing system. I realized Flash audio players are not able to play WAV files so had to work around that. Since users are also using voicemail files in other ways I can't just change the output format from Asterisk. The type of file that I'm working with is identifed with file ms0012.WAV as: msg0012.WAV: RIFF (little-endian) data, WAVE audio, GSM 6.10, mono 8000 Hz


First I'll say that I found this post http://www.thiscoolsite.com/?p=73 but like some of the commenters I couldn't get the script to work. The author assumes some other format than Asterisk spits out by default. Lame would complain that Unsupported data format: 0x0031



The Tools
Sox: http://sox.sourceforge.net/
Lame: http://lame.sourceforge.net/

So here's what I do:
Convert GSM encoded wav to Microsoft PCM
sox msg0012.WAV -s msg0012.wav

Convert the PCM wav to mp3:
lame msg0012.wav msg0012.mp3

And here's a script to do this as a batch:

Comments

Unknown said…
Thanks for this, I'm writing a converter so I can listen to my voice mail on my Android phone and encountered the same problem feeding the wav file to lame.
May 6, 2010 at 10:44 PM
Anonymous said…
Thank you for this !
a big help
September 9, 2011 at 3:55 AM
Anonymous said…
where's the path of the script? it will run in cron job or what?
May 10, 2012 at 3:12 AM
Author said…
Thanks for the post..
Here is online free mp3 to wav converter
convert mp3 to wav
January 16, 2013 at 3:52 AM
Anonymous said…
Have you tried Faasoft Audio Converter? A good gsm converter.
April 10, 2014 at 11:24 PM
Unknown said…
This comment has been removed by the author.
February 2, 2015 at 12:07 PM
Unknown said…
This works, but I found a simpler script that only converts once and in my testing results in better sound quality: http://community.spiceworks.com/how_to/890-converting-wav-files-into-mp3-s-automatically-for-asterisk-recordings.
February 2, 2015 at 12:08 PM
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