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

[Vikram Ragukumar]

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.
> 
> 
>     
>