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

From: Andreas Pretzsch
Subject: Re: [Linphone-developers] No sound in video call
Date: Fri, 12 Oct 2007 20:34:36 +0200
User-agent: KMail/1.9.5

Am Freitag 12 Oktober 2007 19:54 schrieben Sie:
> > 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.
> Indeed - trying again and again sometimes results in a successful
> connection. But it is not predictable.

Great to hear you see the same behaviour. Well, at least in some sense. 

> > I could see no pattern beside that without video it worked always
> > irrc. Also the bandwidth limits had some influence iirc.
> Interesting point - I  always suspected (and you make me more
> certain) the issue has to do with the GSM codec.

Hmmm, I vaguely remember seeing this with different codecs, not only GSM 
but also speex. But I'm not 100% sure right now.

> > Switching from soundcard to file playback always worked.
> What did you do here? Did you tried the command line version of
> linphone (forgot its name - linphonec??) - to what avail?

Yes, as I use it on an embedded platform, so I have no use for a GUI.
BTW, if anybody needs a video variant without the need of some X display 
(SDL dummy output did not work, but one can use X over network), I 
hacked together some code. Will commit it as soon as it is cleaned up.

Regarding sound files instead of a real soundcard, you need the cli 

linphonec> help soundcard
'soundcard list' : list all sound devices.
'soundcard use <index>' : select a sound device.
'soundcard use files' : use .wav files instead of soundcard
linphonec> help play
This feature is available only in file mode (see 'help soundcard')
'play <wav file>'    : play a wav file.
linphonec> help record
This feature is available only in file mode (see 'help soundcard')
'record <wav file>'    : record into wav file.

> > 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.
> Anyway - if there is something I can do to help - please let me know.

Hmmm, I think narrowing down the scenario where the problem occurs would 
be helpful to everybody who is concerned.

> Have a nice weekend
> Conrad



carpe noctem engineering
Ingenieurbuero fuer Hard- & Software-Entwicklung Andreas Pretzsch
Dipl.-Ing. (FH) Andreas Pretzsch                 Tel. 0731/98588-800
Marlene-Dietrich-Strasse 5                       Fax: 0731/98588-801
89231 Neu-Ulm                                    email: address@hidden

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