Hi Ross,
Thanks for your help. I'm running under Windows. I have spied
RTCP packets on the faulty stream and I have seen that Sender Report / Source
Definition packets with a different CNAME and SSRC are sent periodically. So
I have check my code and found that audio and video are sent on the same
multicast address that explains the issue. I fix it and all works fine.
Best regards
Jean-Luc Bonnet
De : live-devel [mailto:[email protected]] De la part de Ross
Finlayson
Envoyé : 31août15 16:31
À : LIVE555 Streaming Media - development & use
Objet : Re: [Live-devel] 2 SSRC on the same RTP stream
Thanks for the quick reply. In fact I stream each video on a
separate multicast addresses:
* The first on 239.20.31.1:5004 which works fine. the SSRC is always
the same on all RTP packets
* The second on 239.20.31.2:5004
Are you running Linux? Linux has a bug (though some people don't want to call
it a 'bug') whereby if more than one process joins the same multicast group -
but with a different port number - then all of these processes will receive
copies of all multicast packets for all of these port numbers. (Note that
other Unix variants (including BSD) - as well as Windows - don't have this
behavior; it's a problem just with Linux.)
Modern versions of Linux, however (starting, apparently, with Linux kernel
version 2.6.31), have a "setsockopt()" option - called IP_MULTICAST_ALL - that
allows you to disable this behavior. The "LIVE555 Streaming Media" code (since
version 2013.10.03) automatically calls "setsockopt()" to disable this behavior
- if "IP_MULTICAST_ALL" is defined.
So, make sure that you're using a sufficiently modern version of Linux - one in
which the IP_MULTICAST_ALL setsockopt() option is defined. That should solve
your problem.
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.live555.com_&d=BQMF-g&c=0hKVUfnuoBozYN8UvxPA-w&r=3XFFEif9Py38PEs0FFH8jAYw83O__O1W1utDvwu8QzA&m=ZwxVZSelNnAK8pjIVHHjXKB2rEbpfJ3KhAYYLtdKLq0&s=2F_5Po2ju22TQ56MXSJT2HLVJVu3RJLIzf9qulLpZWA&e=>
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