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

[Simon Morlat]

Hi Andreas,

Your problem makes me think to a mysterious behaviour I have observed on one 
machine, where the alsa drivers suddenly stopped to catpure audio after a few 
packets sent ( 3 or 4).
Similarly, the problem never produces when video is disabled, but I can't see 
the relationship between video and audio, since both uses different threads 
and file descriptors.
I could never investigate more this problem since that computer was not mine.
Running linphonec -d 6 (to enable logs) would let me confirm that this is the 
same problem.

Simon

Le Friday 12 October 2007 16:14:38 Andreas Pretzsch, vous avez écrit :
> 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)