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### How to convert some WAVe files to u-law, a-law or gsm on Linux? ### |
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Many VoIP solutions (like Asterisk) are using the u-law, a-law or gsm sound for… |
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Here are some examples: |
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* Converting a WAVe file to u-law |
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sox filein.wav -r 8000 -t ul -U -c 1 fileout.ulaw |
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* Converting a WAVe file to a-law |
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sox filein.wav -r 8000 -t al -A -c 1 fileout.alaw |
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* Converting a WAVe file to gsm |
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sox filein.wav -r 8000 -t gsm -g -c 1 fileout.gsm |
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What does these option mean? |
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filein.wav - the input file |
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-r 8000 - resampling the input file to 8 KHz |
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-t xx - setting output format to xx (ul, al, gsm) |
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-U - setting the output encoding to U-law |
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-A - setting the output encoding to A-law |
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-g - setting the output encoding to gsm |
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-c 1 - only one channel (mono) |
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fileout.xxx - the output file |
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Now, what if you don't have one or two such files to convert, but THOUSANDS? No… |
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for myfiles in *.wav ; do sox $myfiles -r 8000 -t ul -U -c 1 `basename $myfile… |
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Note, that I also used basename here to write new files without their old ".wav… |
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