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

[Damien Sandras <dsandras seconix com>]

OK, I've investigated a bit.

Here is what I understand of the problem :
- at some point the local GnomeMeeting stops receiving video RTP data
for an unknown reason
- the behavior there is to stop the H.261 reception (no recovering is
implemented). Netmeeting probably tries to recover, that is why you stop
receiving.

Now you have to determine why it stops receiving video RTP data with the
message "Data read error (11): Resource temporarily unavailable".

That message is a standard error when reading from a socket.

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).

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?

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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-- 
 _	Damien Sandras
(o-	GnomeMeeting: http://www.gnomemeeting.org/
//\	FOSDEM 2003:  http://www.fosdem.org
v_/_	H.323 phone:  callto://ils.seconix.com/dsandras seconix com