<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div><blockquote type="cite" class=""><div class="WordSection1" style="page: WordSection1; font-family: Helvetica; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> </span><span class="" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);"> </span><span lang="EN-US" class="" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);">Thanks for the quick reply. In fact I stream each video on a separate multicast addresses:</span></div><div style="margin: 0cm 0cm 0.0001pt 38.25pt; font-size: 12pt; font-family: 'Times New Roman', serif; text-indent: -18pt;" class=""><span lang="EN-US" style="font-size: 11pt; font-family: Symbol; color: rgb(31, 73, 125);" class=""><span class="">·<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" class=""> <span class="Apple-converted-space"> </span></span></span></span><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">The first on 239.20.31.1:5004 which works fine. the SSRC is always the same on all RTP packets<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt 38.25pt; font-size: 12pt; font-family: 'Times New Roman', serif; text-indent: -18pt;" class=""><span lang="EN-US" style="font-size: 11pt; font-family: Symbol; color: rgb(31, 73, 125);" class=""><span class="">·<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" class=""> <span class="Apple-converted-space"> </span></span></span></span><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">The second on 239.20.31.2:5004</span></div></div></blockquote><div><br class=""></div>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.)</div><div><br class=""></div><div>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.</div><div><br class=""></div><div>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.</div><br class=""><div apple-content-edited="true" class="">
<span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px;"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; ">Ross Finlayson<br class="">Live Networks, Inc.<br class=""><a href="http://www.live555.com/" class="">http://www.live555.com/</a></span></span>
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