asterisk users - Nov 2004 - Record() and problems converting with sox.

Hi,

I'm trying to convert a high(er) quality wav/ulaw/alaw file (captured with
Record()) to a gsm file and can't get the bugger to work. The example on the
page http://www.voip-info.org/wiki-Asterisk+sound+files says that:

$ sox inputfile.wav -r 8000 -c 1 outputfile.gsm resample -ql

Should work, but I get the error message:

sox: Input and Output rates must be different to use resample effect

I get the same error message with

$ sox -t la inputfile.alaw -r 8000 outputfile.gsm resample -ql

And also with WAV, ulaw and everything else. I've trawled through the man
page and am still completely bamboozled - it doesn't explain exactly what is
necessary for it to work properly.

I'm currently running sox version 12.17.6 (the latest) with gsm support
enabled.

Any ideas?

Cheers,

Nick.

Nick Barnes wrote:
> sox: Input and Output rates must be different to use resample effect
This means exactly what it says. You have asked for the output sample 
rate to be 8KHz, so apparently the input sample rate must _already_ be 
8KHz, which means there is no resampling required.

Since you said that the input file was recorded using the Record() app, 
then it's guaranteed that the input file is already 8Khz sample rate, 
since that's all Asterisk can generate.