Re: [GnomeMeeting-list] GnomeMeeting / NetMeeting Voice Codec Problems

[Dierk Brunner <dierk_brunner freesurf ch>]

Am Sonntag, 29. Februar 2004 20.27 schrieb Damien Sandras:
> > First we found out, that NetMeeting does not use the user defined codec
> > setting anymore when GnomeMeeting is on the other side of the connection.
> > A normal voice codec negotiation with all installed codecs is done
> > instead.
>
> The user-defined codec setting of Netmeeting doesn't mean other codecs
> are disabled, it simply means that you put the selected codec as
> prefered, ie the first one in the list.

Thanks Damien! Now I understand a bit better what NetMeeting does!

> > The codec negotiation between both sides seems not to be affected by the
> > codec ordering in GnomeMeeting. By disabeling the codecs in GnomeMeeting
> > step by step, we could find out that the codec selection priority is:
> >
> > - G.711-uLaw-64k
> > - G.711-ALaw-64k
> > - MS-GSM
>
> Not true, it depends on the codecs order on Netmeeting's side.

Yes, we did not change the codec order on Windows XP.

> > When all these codecs are disabled in GnomeMeeting, no voice connection
> > is established anymore! It looks like that GnomeMeeting and NetMeeting do
> > not recognize that the GSM-06.10 and Speex voice codex are available on
> > both sides! No matching voice codec (beside G.711* and MS-GSM) is found
> > although these codecs are installed on both sides!
>
> Do you mean that you hear nothing, or that you see that no sound
> channels are opened in the history?

Both! We do not hear anything and no voice channels are opened.
There is no message showing the name of a voice codec in the "chronic view".

> > Currently I do not have any idea how I can get GnomeMeeting and
> > NetMeeting to communicate with each other using an acceptable voice
> > codec! I am also surprised that even GSM-06.10 did not work!
>
> I'm surprised too!
> It must be another problem, you should try to describe your problem with
> more details and alternatively send a level 3 debug output.

I could only get MS-GSM working between NetMeeting and GnomeMeeting.
We could not get both systems to use GSM-06.10.

In general the quality with MS-GSM is very low, especially compared to Speex
8kBit/s (that we both tried out under NetMeeting). With MS-GSM we always
get a strange, annoying "bubble sound" in the background. - I love diving, but
not when I want discuss serious topics over a VoIP connection.

I already had a look at GnomeMeeting's debugging output, but it simply
shows that the problematic codecs (GSM-06.10 and Speex) do not seem to
fit somehow. Are these codecs not "compatible"? If yes, how can I make them
interoperating?

    Dierk