Re: [Linphone-developers] No sound in video call

[Andreas Pretzsch]

Dear Simon,

I stumbled across similar problems some weeks ago.
Audio/Video-call between linphonec 1.7.1 and Eyebeam 1.5 (WinXP), direct 
IP calling in the LAN, so no NAT or whatever in between.
Platform was an embedded Linux with ALSA running on ARM.

Sometimes there was no outgoing audio (no audio rtp packets sent), 
incoming audio was perfect. Outgoing video was ok, no incoming video 
stream (intentionally none provided by peer).
Terminating the call and reestablish a new call to the same peer without 
any change several times lead to a functional connection from time to 
time.
I could see no pattern beside that without video it worked always irrc. 
Also the bandwidth limits had some influence iirc.
Switching from soundcard to file playback always worked.
Codec negotiation looked good at the first glance.

Just wanted to throw in a "something seems to be not perfect".
I had no time so far to dig deeper, but I definitivly will, as I need to 
get this stable. I'll be glad to help tracking this down, but most 
probably not before end of November.

BTW, great work, I'll come back to you regarding commercial support as 
soon as my customer got out of the evaluation phase.

Best regards,
  Andreas


Am Freitag 12 Oktober 2007 15:07 schrieb Simon Morlat:
> Hi Conrad,
>
> From the linphone.log file, I can see that everything goes quite well
> from the linphone point of view, except that it effectively does not
> receives any audio packets.
> The ffmpeg warnings on stderr are not a problem.
> Perhaps a firewall issue ? Actually I have no idea. Understanding
> would require to understand what is happening at the asterisk side.
>
>
> Simon
>
> Le Thursday 11 October 2007 23:33:41 Conrad Beckert, vous avez écrit :
> > Hi Simon,
> >
> > ... today my mother had time for a little test :-) Everything was
> > fine so far (almost disappointing for not having anything to report
> > here :-) ) until I decided to call her.
> >
> > Then same scenario as before:
> >
> > 1. what appears on the stderr:
> >
> > $linphone --verbose>log
> > [h263 @ 0xb7304508]rc buffer underflow
> > [h263 @ 0xb7304508]rc buffer underflow
> > [h263 @ 0xb7304508]rc buffer underflow
> > [h263 @ 0xb7304508]warning, clipping 1 dct coefficients to
> > -127..127 [h263 @ 0xb7304508]warning, clipping 1 dct coefficients
> > to -127..127 ... and so on ...
> > [h263 @ 0xb7304508]warning, clipping 1 dct coefficients to
> > -127..127 [h263 @ 0xb7304508]warning, clipping 1 dct coefficients
> > to -127..127 [h263 @ 0xb7304508]rc buffer underflow
> > [h263 @ 0xb7304508]rc buffer underflow
> > [h263 @ 0xb7304508]rc buffer underflow
> > [h263 @ 0xb7304508]warning, clipping 1 dct coefficients to
> > -127..127 [h263 @ 0xb7304508]warning, clipping 1 dct coefficients
> > to -127..127 ... and so on ...
> > [h263 @ 0xb7304508]warning, clipping 1 dct coefficients to
> > -127..127
> >
> > (linphone:11922): Gtk-CRITICAL **: gtk_widget_destroy: assertion
> > `GTK_IS_WIDGET (widget)' failed
> > [h263 @ 0xb7304508]warning: first frame is no keyframe
> > [h263 @ 0xb7304508]rc buffer underflow
> > [h263 @ 0xb7304508]warning, clipping 1 dct coefficients to
> > -127..127 [h263 @ 0xb7304508]warning, clipping 1 dct coefficients
> > to -127..127 ... and so on ...
> >
> >
> > 2. now the log:
> > ... see attachment  ...
> >
> > What I did:
> > - my number is 2002, her's is 3101
> > - we are both connected to an Asterisk server
> > - 3101 calls 2002 with no problems at all (*)
> > during my test as documented in the log:
> > - 2002 calls 3101 via the same infrastructure
> > - images both ways but no sound
> > - 2002 calls 3101 once again-> same procedure, same results
> > - 3101 calls back - no sound but images...
> > - tried to call voice only on the phone -> hung.
> >
> > What's wrong here? It looks like the Audio RTP packets get stuck
> > somewhere. But why do the video ones get through. And why does has
> > this issue occured earlier when we connected directly whithout
> > Asterisk. 2002 is on the open Internet. 3101 has a NAT router in
> > between which works fine for outgoing and incomming rtp once 2002
> > issues the call. Strange isn't it.
> >
> >
> > Another - probably unrelated point: From time to time 3101 gets a
> > really bad noise reminiscent of an old telephone modem. It comes up
> > from time to time. (unregularily - somtimes after 10 min, sometimes
> > 20 - once immediately - no reproducable scheme ) We have to
> > reconnect.
> >
> > My soundcard (at 2002) : 00:10.0 Multimedia audio controller: ESS
> > Technology ES1969 Solo-1 Audiodrive (rev 02)
> >
> >
> > Thanks for help
> > Conrad
> >
> > Am Donnerstag, den 04.10.2007, 22:41 +0200 schrieb Simon Morlat:
> > > Hi Conrad,
> > >
> > > In this case I could that the problem was actually with the alsa
> > > driver totally hung, and enable to record any sound.
> > > Send me a log  with --verbose so that I'll confirm .
> > >
> > > Simon
> > >
> > > Le Sunday 23 September 2007 00:28:22 Conrad Beckert, vous avez 
écrit :
> > > > Hi,
> > > >
> > > > has anybody have an idea what's wrong here or at least a hint
> > > > on how to fence this issue:
> > > >
> > > > I use linphone on Ubuntu 6.10 (Efty Eft). I have an Asterisk
> > > > server to connect to which I use for voice calling and various
> > > > Windows-Linphone endpoints. No problems at all.
> > > >
> > > > My machine on Ubuntu sometimes causes sound problems: As long
> > > > as I do voice calling, everything is ok. Videocalls sometimes
> > > > come without sound in both ways.
> > > >
> > > > It is obviously no routing issue as images get transfered with
> > > > no problems at all. Only sound is missing. Sometimes it helps
> > > > to try again - the 5th 6th or something attempt might be
> > > > successful.
> > > >
> > > > I upgraded from 1.7.xx to 1.99.2 from buildserver.net as I
> > > > suspected an issue with this particular version - no avail
> > > > (1.99 as Beta is less stable - the sound issue continues)
> > > >
> > > > I suspect some codec woes but have no idea how to find out,
> > > > what's wrong. Do you have an idea? Is there a way to trace - to
> > > > see what happens?
> > > >
> > > > Thanks for help
> > > > Conrad
> > > >
> > > > PS: This is a version (both 1.7.xx. and 1.99) of which the
> > > > local (mirror) images are just funny greem squares. I wonder
> > > > what's this (got a Philips PWC cam, I remember having
> > > > experienced this before and solved it by a different cam)


-- 

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