Wes,

it's because you are confusing 2 things.
GSM is a codec, so it's a sound format.
WAVE is a kind of container (like MKV) that can contain various codecs.
In your case, you probably did a mistake using sox (it's not an easy tool), so you ended up with a wav which is still GSM audio inside.

You have to tell sox which exact output format you want.
AFAIR, you have to use the -s option (for signed linear).

David Ponzone  Direction Technique
tel:      01 74 03 18 97
gsm:   06 66 98 76 34

Service Client IPeva
tel:      0811 46 26 26

Ce message et toutes les pièces jointes sont confidentiels et établis à l'intention exclusive de ses destinataires. Toute utilisation ou diffusion non autorisée est interdite. Tout message électronique est susceptible d'altération. IPeva décline toute responsabilité au titre de ce message s'il a été altéré, déformé ou falsifié. Si vous n'êtes pas destinataire de ce message, merci de le détruire immédiatement et d'avertir l'expéditeur.




Le 24/06/2011 à 23:26, Wes a écrit :

In my tests, if I record a call in .wav format, a 10 second file is
about 177,000 bytes, while a 10 second .gsm file is 17,000 bytes.

I  then used sox to convert the .gsm file to a .wav file, and it stayed
at around 17,000 bytes.  So, is the default recording format for .wav
using a higher sample rate? vs the default conversion format for the sox
tool?

checking the file type using "file" I see that the larger one is:
RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 8000 Hz

and the wav created by sox via the default conversion from .gsm is:
RIFF (little-endian) data, WAVE audio, GSM 6.10, mono 8000 Hz

So apparently the larger wav file is 16 bit... how are these recording
parameters controlled?  Can I set it to record directly into the smaller
wav format? Or will I have to run sox on every file...

_______________________________________________
Join us at ClueCon 2011, Aug 9-11, Chicago
http://www.cluecon.com 877-7-4ACLUE

FreeSWITCH-users mailing list
FreeSWITCH-users@lists.freeswitch.org
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
http://www.freeswitch.org