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

[Vikram Ragukumar]

Hello,

I would also like to mention that the rtpproxy recorded .rtp files were 
generated using the following command

rtpproxy -l listen_ip_address -s udp:127.0.0.1:7722 -a -P -F -r 
record_directory_path -S spool_directory_path

where -P indicates that files would be recorded in the pcap format.

Thanks and Regards,
Vikram.

Vikram Ragukumar wrote:
> 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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>>
>>
>>
>> -- 
>> Carsten Bock
>> Schomburgstr. 80
>> 22767 Hamburg
>> Germany
>>
>> Mobile +49 179 2021244
>> Home +49 40 34927217
>> Fax +49 40 34927218
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>>
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>> God had wanted man to play soccer, he wouldn't have given us arms."
> 
> 
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