[Live-devel] TR: 2 SSRC on the same RTP stream
De : Jean-Luc Bonnet Envoyé : 31août15 14:21 À : Objet : 2 SSRC on the same RTP stream Hi Ross I'm using Live555 Streaming Media to stream two H264 videos over RTP and I decode them with Two GStreamer pipes on another computer. · It works fine on one channel and sometime with the two channels. · But very often the second channel doesn't work. GStreamer can decode the stream. I analyze the stream with Wireshark and I see that in that case there are 2 different SSRC. One (0xBC890740 for example) where all H264 packets are correct and another (OxDDD4D704 for example) where H264 packets are wrong. There is an abrupt change for sequence number and time for one SSRC to the other. Do you have already see this behavior? Thank for your help. Regards Jean-Luc Bonnet ___ live-devel mailing list live-devel@lists.live555.com http://lists.live555.com/mailman/listinfo/live-devel
Re: [Live-devel] TR: 2 SSRC on the same RTP stream
Ross, 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 o When it works the SSRC is always the same on all RTP packets o When it doesn't work, there are 2 different SSRC! Correct H264 packets have one SSRC and wrong H264 packets have the second SSRC. I don't understand why there is this second SSRC. It is the same process that streams these 2 video using Live Media. Regards Jean-Luc Bonnet De : live-devel [mailto:live-devel-boun...@ns.live555.com] De la part de Ross Finlayson Envoyé : 31août15 15:08 À : LIVE555 Streaming Media - development & use Objet : Re: [Live-devel] TR: 2 SSRC on the same RTP stream Sorry, but we currently don't support that (receiving a stream with more than one SSRC multiplexed on the same port). For now at least, you'll need to have each H.264 stream use a separate port number (and receive each one using a separate "RTPSource"). 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=CxxSyg3ak2sUQ3c-j4YTFfCEwkRZemho1s4_XnFMooU&s=Yo05jnsNNIqbaK6BsmWHSpQRqk9ufTLfgJnHRQGqLeM&e=> ___ live-devel mailing list live-devel@lists.live555.com http://lists.live555.com/mailman/listinfo/live-devel
Re: [Live-devel] 2 SSRC on the same RTP stream
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:live-devel-boun...@ns.live555.com] 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=> ___ live-devel mailing list live-devel@lists.live555.com http://lists.live555.com/mailman/listinfo/live-devel
[Live-devel] Live Media Server - Retrieve SSRC
Hi Ross, I'm using Live Media Server to stream several H264 video under RTP. It is working fine. My RTP client need that session is announced with a SAP server. It's easily done with a Groupsock instance. But inside the SDP, it needs special media attributes such as SSRC but be sure to catch the right RTP packets. I have found RTPSink::SSRC() method to retrieve it, but unfortunately this method is protected. How can I retrieve SSRC easily? Best regards. Jean-Luc Bonnet ___ live-devel mailing list live-devel@lists.live555.com http://lists.live555.com/mailman/listinfo/live-devel
Re: [Live-devel] [EXTERNAL] Re: Live Media Server - Retrieve SSRC
Thanks Ross. Best regards Jean-Luc Bonnet -Message d'origine- De : live-devel [mailto:live-devel-boun...@ns.live555.com] De la part de Ross Finlayson Envoyé : 2juin16 07:27 À : LIVE555 Streaming Media - development & use Objet : [EXTERNAL] Re: [Live-devel] Live Media Server - Retrieve SSRC > I have found RTPSink::SSRC() method to retrieve it, but unfortunately this > method is protected. How can I retrieve SSRC easily? OK, in the next release of the “LIVE555 Streaming Media” software, I’ll make this function “public:” Ross Finlayson Live Networks, Inc. https://urldefense.proofpoint.com/v2/url?u=http-3A__www.live555.com_&d=DQIGaQ&c=0hKVUfnuoBozYN8UvxPA-w&r=3XFFEif9Py38PEs0FFH8jAYw83O__O1W1utDvwu8QzA&m=iU_kCjZTc7WM0OY6ziaPXhsjkRX_Vj-Wqyj6ul2WraQ&s=oMVTyvEyUqp2_TQyl5wSCuJIvJKVD3sNqPevvcT71Z0&e= ___ live-devel mailing list live-devel@lists.live555.com https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.live555.com_mailman_listinfo_live-2Ddevel&d=DQIGaQ&c=0hKVUfnuoBozYN8UvxPA-w&r=3XFFEif9Py38PEs0FFH8jAYw83O__O1W1utDvwu8QzA&m=iU_kCjZTc7WM0OY6ziaPXhsjkRX_Vj-Wqyj6ul2WraQ&s=Zco_Uxq9To_fIchs9NavTVexsvVgR2kHFAhWFX3aAdE&e= ___ live-devel mailing list live-devel@lists.live555.com http://lists.live555.com/mailman/listinfo/live-devel
