[dvblast-devel] Multiple Stream Issue

[Richard Hemzal]

Hi,

 

have noted similar issues, but not sure if same. I just guess you mean that doing diagnostic problem after sending stream over
Gigabit network using UDP. Right?

I recommend to  make dump using wireshark. Then check what are time distances between packets of one stream. When see that those are
short sequences where packets are about about 10useconds far and than pause for mseconds (in one channel stream), then I can say you
have met bursting issue. This will cause loose of packets for VLC. But problem is not caused by VLC or dvblast, but issue is in
switch which drops some packets. It has workaround using QoS/shaper on streamer. There is couple of sources over internet about it.
Have verified it already, it is real issue. 

If this is TCP , forget this above. ;-)

Comments welcomed.

 

 

From: dvblast-devel-bounces at videolan.org [mailto:dvblast-devel-bounces at videolan.org] On Behalf Of Armin Zeid
Sent: Monday, March 05, 2012 10:22 PM
To: Mailing list for DVBlast developers
Subject: [dvblast-devel] Multiple Stream Issue

 

Hello,

I'm experiencing pixelation and jitter when streaming multiple (4 in my case) channels from one transponder in the same config file
when running one instance of dvblast. 

This doesn't seem to be a network throughput issue since there are no problems when I stream the same number of channels from 4
separate instances of dvblast running using four different dvbs interfaces.

This leads me to think that this is either an application or OS level problem.

I'm running dvblast 2.1 on ubuntu 10.10 and have done tcp/ip tuning on the Ubuntu machine. My dvblast command is:
sudo dvblast  -a 1 -f [freq] -s [pol] -v 18 -S 2 -i 1 -c channel.config

So if i put multiple channels in the config file, I get jittering. If I put 1 channel in each config file and run separate instances
of dvblast, there are no problems.

Has anyone experienced similar problem or have any suggestions?

Thanks

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