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....
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...

Carsten

2010/1/14 Vikram Ragukumar <vragukumar@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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