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[Florent Bertero <question219552@xxxxxxxxxxxxxxxxxxxxx>]

Question #219552 on rohc changed:
https://answers.launchpad.net/rohc/+question/219552

    Status: Answered => Open

Florent Bertero is still having a problem:

Hello Didier,


Thanks for your answer and sorry for my late reply.


I now get the idea.


One last question though, what software would you advice me to use to implement the library?
Of course, any tutorial would be greatly appreciated  :)


Thanks again,
Rgds
Florent Bertero

> To: flo.bertero@xxxxxxxxxx
> From: question219552@xxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [Question #219552]: rohc 1.5.1 does not compress VoIP
> Date: Sun, 20 Jan 2013 18:01:18 +0000
> 
> Your question #219552 on rohc changed:
> https://answers.launchpad.net/rohc/+question/219552
> 
>     Status: Open => Answered
> 
> Didier Barvaux proposed the following answer:
> > I use iftop and my router as 2 different tools to mesure
> > outgoing bandwith in 2 different cases.
> >     - When the tunnel is up and my call goes through the tunnel.
> >     - When the tunnel is down and my call goes directly to my voip
> >        switch.
> > In those 2 situations, I get the same results.
> 
> If you monitor your SIP/RTP streams with iftop, they'll appear as
> uncompressed because iftop monitors the streams before they got
> compressed. You can monitor the UDP/5000 stream generated by the tunnel
> instead, however the IP/UDP encapsulation added by the tunnel will not
> give you accurate numbers about the ROHC compression.
> 
> 
> > How can I tell my library to use RTP profiles?
> 
> The ROHC library provides 2 ways to tell it that one UDP stream is one RTP stream:
>  - a list of UDP ports configured with rohc_comp_add_rtp_port() [1]
>  - a callback function called for every UDP packet and defined with rohc_comp_set_rtp_detection_cb() [2]
> 
> These functions are not available on the 1.5.x versions. They will be
> shipped with the to-be-released 1.6.0 version. Use the main dev branch
> in the meantime.
> 
> [1] http://bazaar.launchpad.net/~didier-barvaux/rohc/main/view/head:/src/comp/rohc_comp.c#L1368
> [2] http://bazaar.launchpad.net/~didier-barvaux/rohc/main/view/head:/src/comp/rohc_comp.c#L1157
> 
> 
> > Apart from the tunnel, what other way to compress rtp do I have?
> 
> The ROHC library is a library, so it is intended to be used in other
> programs. The library itself does not provide a standalone program
> (except the tunnel tool for testing purposes).
> 
> Regards,
> Didier
> 
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