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<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>A gentle warning when
using GSM codec’s<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Every codec compress
voice at the cost of quality. And some codec’s like GSM and G.729 are not
a nice combination. If you use GSM to save disk space and play it back using
G.729 the resulting voice might contain some added noise due to algorithmic
incompatibility.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>jan<o:p></o:p></span></font></p>
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face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
freeswitch-users-bounces@lists.freeswitch.org
[mailto:freeswitch-users-bounces@lists.freeswitch.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>David Ponzone<br>
<b><span style='font-weight:bold'>Sent:</span></b> 24. juni 2011 23:42<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">FreeSWITCH
Users Help</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Freeswitch-users]
.wav vs .gsm file sizes for recording calls.</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Wes,<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>it's because you are confusing 2 things.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>GSM is a codec, so it's a sound format.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>WAVE is a kind of container (like MKV) that can contain various codecs.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>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.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>You have to tell sox which exact output format you want.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>AFAIR, you have to use the -s option (for signed linear).<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div><span style='orphans: 2;text-align:auto;widows: 2;-webkit-border-horizontal-spacing: 0px;
-webkit-border-vertical-spacing: 0px;-webkit-text-decorations-in-effect: none;
-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:
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-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:
0px'>
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<p class=MsoNormal><font size=2 color="#1c00ff" face="'Helvetica Neue'"><span
style='font-size:10.5pt;font-family:"\0027Helvetica Neue\0027";color:#1C00FF'>David
Ponzone </span></font><span class=apple-style-span><font size=1
color=black face="'Helvetica Neue'"><span style='font-size:9.0pt;font-family:
"\0027Helvetica Neue\0027";color:black'>Direction Technique</span></font></span><font
size=2 color=black face=Helvetica><span style='font-size:10.5pt;font-family:
Helvetica;color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal><span class=apple-style-span><font size=2 color=black
face="'Helvetica Neue'"><span style='font-size:10.0pt;font-family:"\0027Helvetica Neue\0027";
color:black'>email: <a href="mailto:david.ponzone@ipeva.fr">david.ponzone@ipeva.fr</a></span></font></span><font
size=2 color=black face=Helvetica><span style='font-size:10.5pt;font-family:
Helvetica;color:black'><o:p></o:p></span></font></p>
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face="'Helvetica Neue'"><span style='font-size:10.0pt;font-family:"\0027Helvetica Neue\0027";
color:black'>tel: 01 74 03 18 97</span></font></span><font
size=2 color=black face=Helvetica><span style='font-size:10.5pt;font-family:
Helvetica;color:black'><o:p></o:p></span></font></p>
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face="'Helvetica Neue'"><span style='font-size:10.0pt;font-family:"\0027Helvetica Neue\0027";
color:black'>gsm: 06 66 98 76 34</span></font></span><font size=2
color=black face=Helvetica><span style='font-size:10.5pt;font-family:Helvetica;
color:black'><o:p></o:p></span></font></p>
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style='font-size:10.5pt;font-family:Helvetica;color:black'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 color="#1c00ff" face="'Helvetica Neue'"><span
style='font-size:10.5pt;font-family:"\0027Helvetica Neue\0027";color:#1C00FF'>Service
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color="#1c00ff" face="'Helvetica Neue'"><span style='font-size:10.5pt;
font-family:"\0027Helvetica Neue\0027";color:#1C00FF'>eva</span></font><font
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style='font-size:7.5pt;font-family:Arial;color:#0022F3'><a
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size=1 color="#656895" face=Arial><span style='font-size:7.5pt;font-family:
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<p class=MsoNormal style='text-align:justify'><i><font size=1 color=silver
face=Arial><span style='font-size:7.5pt;font-family:Arial;color:silver;
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<br>
</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Le 24/06/2011 à 23:26, Wes a écrit :<o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<br>
<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>In my tests, if I record a call in .wav format, a 10 second file is <br>
about 177,000 bytes, while a 10 second .gsm file is 17,000 bytes.<br>
<br>
I then used sox to convert the .gsm file to a .wav file, and it stayed <br>
at around 17,000 bytes. So, is the default recording format for .wav <br>
using a higher sample rate? vs the default conversion format for the sox <br>
tool?<br>
<br>
checking the file type using "file" I see that the larger one is:<br>
RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 8000 Hz<br>
<br>
and the wav created by sox via the default conversion from .gsm is:<br>
RIFF (little-endian) data, WAVE audio, GSM 6.10, mono 8000 Hz<br>
<br>
So apparently the larger wav file is 16 bit... how are these recording <br>
parameters controlled? Can I set it to record directly into the smaller <br>
wav format? Or will I have to run sox on every file...<br>
<br>
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