Re: [GnomeMeeting-list] Video loss when connecting via 2 Linksys routers

["Kenneth R. van Wyk" <ken vanwyk org>]

On Tuesday 29 April 2003 06:26, Damien Sandras wrote:
> OK, I've investigated a bit.

Thank you!  It's been a very confusing problem for us, and we'd *really* like 
to find a solution or workaround.

> To summarize, at some point, GnomeMeeting fails to read the data coming
> on the socket because the "Resource is temporarily unavailable". In that
> case, it doesn't try to recover, it simply stops the video reception
> (while Netmeeting could simply wait for the resource to be available
> again and try recovering).

That makes sense.  Is it feasible to have GnomeMeeting also attempt to 
wait/recover?

> For me, it has something to do with the Linksys router. What are you
> using: native H.323 support in the router, or port forwarding and IP
> translation?

Both sides are using port forwarding and IP translation (via NAT).  But, as I 
indicated, the sessions initiate successfully and consistently.  It's only 
after a few minutes that the video gets dropped.  While that may well be 
something due to the router, it's not as simple as opening up a particular 
port.  (We both allow UDP/1024-65535, along with TCP/1720 and such during 
video connections.  And, MS-Netmeeting functions just fine with the same 
ports open -- but I'd MUCH rather use GnomeMeeting on my primary Debian 
desktop system for the connections.)

Thanks again for all of your assistance on this.  I hope that we can find the 
problem and fix it so that others can appreciate the added stability in 
GnomeMeeting.  It is a fabulous tool, by the way.  Kudos for doing a superb 
job!

Cheers,

Ken van Wyk

>
> Le lun 28/04/2003 à 23:11, Kenneth R. van Wyk a écrit :
> > Damien,
> >
> > On Monday 28 April 2003 15:56, Damien Sandras wrote:
> > > I suggest you to run GM with --debug=3 and see what happens really.
> > > No the problem is not normal...
> >
> > Thanks.  I've done that and have appended my debug output (excerpt)
> > below.  I also have another data point.  I just tested the same
> > connection, but this time I ran ohphone at my end, with gnomemeeting
> > still at the other end.  The gnomemeeting end dropped video once again,
> > within moments.  The ohphone end continued on for about 15 minutes and
> > then it too went blank.
> >
> > In the gnomemeeting log below, the telltale (to me) line is the RTP_UDP
> > Data Read error (11): Resource temporarily unavailable line.
> >
> > Any ideas what the problem could be?  Could we have stumbled onto a
> > somewhat obscure bug?
> >
> > Thanks for your help.
> >
> > Cheers,
> >
> > Ken van Wyk
> >
> >   2:11.807            LogChanTx:83277e0 H261    Read frame from the video
> > source.
> >   2:11.810            LogChanTx:83277e0 H261    Success. Read frame from
> > the video source in 2 ms.
> >   2:11.839           RTP Jitter:837bb58 RTP     Receive statistics:
> > packets=8111 octets=324440 lost=1533 tooLate
> > =2948 order=1 avgTime=6 maxTime=13 minTime=0 jitter=1 maxJitter=6
> >   2:11.932            LogChanTx:83b2768 H323RTP Transmitter sent
> > timestamp 549440
> >   2:12.036            LogChanTx:83277e0 H261    Read frame from the video
> > source.
> >   2:12.040            LogChanTx:83277e0 H261    Success. Read frame from
> > the video source in 3 ms.
> >   2:12.068            LogChanRx:83b4100 RTP_UDP Data read error (11):
> > Resource temporarily unavailable
> >   2:12.069            LogChanRx:83b4100 H323RTP Receive H.261 thread
> > ended 2:12.166                 gnomemeeting RTP     Found existing
> > session 1 2:12.167                 gnomemeeting RTP     Found existing
> > session 2 2:12.276            LogChanTx:83277e0 H261    Read frame from
> > the video source.
> >   2:12.280            LogChanTx:83277e0 H261    Success. Read frame from
> > the video source in 3 ms.
> >   2:12.296           RTP Jitter:837bb58 RTP     Dropped 2 packet(s) at
> > 50474, ssrc=4282363546
> >
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