[pjsip] Strange RTP receive issue in PJ-MEDIA

Jeremy King jerry.ipe.thomas at gmail.com
Fri Apr 11 14:01:20 EDT 2008

Thanks Benny

  - J

On 4/11/08, Benny Prijono <bennylp at pjsip.org> wrote:
> On Thu, Apr 10, 2008 at 10:41 PM, Jeremy King
> <jerry.ipe.thomas at gmail.com> wrote:
> > Thanks for the RTP header tip! What was being printed wasn't making any
> > sense!
> >
> > After my temporary timestamp generation patch, I can hear audio
> playback,
> > which is great, but quality is bad. I tried the same call with X-Lite as
> > well as SJPhone and audio was good. Is there something I need to or can
> > change/tweak to improve PJ audio quality?
> There is a problem if you use sequence number instead of timestamp to
> feed the frame to jitter buffer, namely that you won't be able to
> handle multiple frames inside one RTP packet. With G.711 codec, this
> will happen all the time as the definition of G.711 frame is 10ms,
> while normally an RTP packet contains 20ms worth of frame. So half of
> the audio is lost!
> As you said remote is sending RTP with timestamp equal to zero (all
> the time). This is just wrong, and you must fix that instead of fixing
> PJSIP. Frankly I don't care if any other softphones handle this, I'm
> not bothered. :)
> > I have attached the audio capture files for PJ, SJPhone and X-Lite
> > annoucement playback for the same announcement. The attachment,
> > 20080411014500_TS1.tar.bz2, is ~1.63 MB. I hope it doesn't get blocked.
> >
> It does. It's too big for this list.
> Cheers
> Benny
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  - Jerry
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