[Freeswitch-users] Transcoding to GSM using SOX

Brian West brian at freeswitch.org
Mon Nov 3 19:45:59 PST 2008

How are you trying to play these files?


On Nov 3, 2008, at 9:01 PM, Brian Wood wrote:

> I'm trying to transcode a .wav to a .gsm using SOX v14.0.1. What I get
> is a completely garbled when using playback in FreeSWITCH. I have
> verified that at least one other application (Quicktime Player) can in
> fact play the resulting .gsm file.
> I have tried the following:
>    sox william.wav -t gsm william.gsm
>    sox william.wav -t gsm -r 8000 william.gsm resample -ql
>    sox william.wav -t gsm -r 8000 -c1 william.gsm resample -ql
> And I am playing the file using:
>    originate sofia/internal/1000 at
> &playback(/home/user/william.gsm)
> Other formats such as uLaw and aLaw (-t ul and -t al, respectively)  
> seem
> to work fine.
> Does anyone know of a set of parameters for SOX that will make this  
> work?
> At the end of the day, I just want it to work, so if anyone can
> recommend any other known/good command line tools to encode GSM that
> would be fine too.
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