[Kamailio-Users] Converting rtpproxy recorded .rtp file to .wav file

[Vikram Ragukumar]

Carsten,

Thank you for your reply.

Carsten Bock wrote:
> Hi,
> 
> 1)
> Did you try to post your problem on the RTP-Proxy-Users' List?
> http://lists.rtpproxy.org/mailman/listinfo/users
> Probably, you might get more help there....

Yes i have posted on rtpproxy users list.

> 2)
> Did you try to extract the Audio with Wireshark? If Wireshark can play 
> the Audio (and i assume it is correctly implemented), then the recorded 
> stream as such is correct. Then you can check, if the bug lies in 
> rtpbreak (or as a next step: sox). Just to limit the possible sources of 
> the problem...

I have not tried Wireshark to extract the audio. I have been using 
rtpbreak to generate the .raw file. Subsequent to which i use sox to 
convert the .raw to a .wav file. By importing the the .raw file into 
Hypersignal software, we found that the .raw file doesnt entirely seem 
to be composed of speech samples, so there could be a problem at the 
rtpbreak step.

This is the command i used to convert rtpproxy's capture file to .raw format

rtpbreak -W -r capturefile.rtp

Am i missing something here ?

Thanks and Regards,
Vikram.

> Carsten
> 
> 2010/1/14 Vikram Ragukumar <vragukumar at signalogic.com 
> <mailto:vragukumar at signalogic.com>>
> 
>     Hello,
> 
>     An update,
> 
>     I tried using sox to convert the two .raw files into 2 mono channel
>     wave files. The command line i used is below :
>     sox -r 8k -b -c 1 -u rtp.0.0.raw rtp0.wav
>     sox -r 8k -b -c 1 -u rtp.1.0.raw rtp1.wav
> 
>     When i listen to the .wav files, i hear speech but it is buried in a
>     lot of noise. During blank periods (periods of no speech) there is a
>     constant volume high pitched noise. Also during periods of speech,
>     there seems to be bursts of noise in the background.
> 
>     The other engineer i work with and i, think that it is possibly
>     because non-speech data is being interpreted as speech.
> 
>     What switch options should i change while invoking sox from the
>     command line to get rid of the noise?
> 
>     Thanks and Regards,
>     Vikram.
> 
> 
> 
>     Vikram Ragukumar wrote:
> 
>         Hello,
> 
>         I used Kamailio+rtpproxy to record a session and rtpproxy
>         outputs the following files
> 
>         long_file_name.a.rtp, long_file_name.a.rtcp,
>         long_file_name.o.rtp, long_file_name.o.rtcp
> 
>         http://www.rtpproxy.org/wiki/RTPproxy/FAQ
>          From the Rtpproxy FAQ above, i tried to extract the audio using
>         rtpbreak and sox.
> 
>         rtpbreak -W -r long_file_name.a.rtp
>         rtpbreak -W -r long_file_name.o.rtp
> 
>         The above commands generate rtp.0.0.raw, rtp.1.0.raw.
> 
>         Then when i run sox using
>         sox --combine merge -r 8k -A rtp.0.0.raw -r 8k -A rtp.1.0.raw -t
>         wavpcm -s out.wav i get the following errors :
> 
>         sox: invalid option -- -
>         sox: -c must be given a number
> 
>         Is there a switch/anything else that i am missing ?
> 
>         Thanks in advance,
>         Regards,
>         Vikram.
> 
> 
>            
> 
> 
> 
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> 
> 
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