You can use SOX command in linux
# man sox
# sox NONasteriskXXX.wav -c 1 -r 8000 asteriskXXX.gsm
(it resamples the non asterisk audio file in single channel audio with 8Khz sampling frequency)
If you have tons of wav file, it's waste of time to type a command for every individual wav files. So, you can do the following
Let's say you have WAV files in /tmp/recordings directory.
/tmp/recordings# for i in *
> do
> sox $i -c 1 -r 8000 `echo $i|sed "s/.wav/.gsm/"`
> done
Ooola.. it's done!!! You just converted all the files in /tmp/recordings directory from WAV to gsm.
Here, we are using for loop to go thru' each files in the /tmp/recordings directory. '$i' returns the file name. 'sed "s/.wav/.gsm/"' renames the file from .wav to .gsm
# man sox
# sox NONasteriskXXX.wav -c 1 -r 8000 asteriskXXX.gsm
(it resamples the non asterisk audio file in single channel audio with 8Khz sampling frequency)
If you have tons of wav file, it's waste of time to type a command for every individual wav files. So, you can do the following
Let's say you have WAV files in /tmp/recordings directory.
/tmp/recordings# for i in *
> do
> sox $i -c 1 -r 8000 `echo $i|sed "s/.wav/.gsm/"`
> done
Ooola.. it's done!!! You just converted all the files in /tmp/recordings directory from WAV to gsm.
Here, we are using for loop to go thru' each files in the /tmp/recordings directory. '$i' returns the file name. 'sed "s/.wav/.gsm/"' renames the file from .wav to .gsm
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