<div dir="ltr">if you are using TCP as transport, this should already be the case AFAIK.<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 16 Dec 2021 at 11:15, Bruce Liang via gstreamer-devel <<a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal"><span lang="EN-US">Hi,</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> I'm using gst-rtsp-server to test multicast rtp stream with indicated address and port.</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> Threre are 2 streams in gst-rtsp-server and I'm using 2 rtcp clients to setup and play stream 0 and then stream 1 with same transport header.</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> The transport header is:</span></p>
<p class="MsoNormal"><span lang="EN-US"> RTP/AVP;multicast;destination=224.3.0.2;ttl=64;port=5702-5703</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> The SETUP request to setup stream 0 is success but the SETUP request to stream1 is failed and the following response is returned:</span></p>
<p class="MsoNormal"><span lang="EN-US"> RTSP/1.0 461 Unsupported transport</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> And I got the following debug log:</span></p>
<p class="MsoNormal"><span lang="EN-US"> 0:00:05.501051300 974 0x7fffefbb7d80 DEBUG rtspstream rtsp-stream.c:1548:alloc_ports_one_family:<GstRTSPStream@0x7f5f4804ade0> rtp bind() failed, will try again</span></p>
<p class="MsoNormal"><span lang="EN-US"> 0:00:05.501133200 974 0x7fffefbb7d80 ERROR rtspstream rtsp-stream.c:1682:alloc_ports_one_family:<GstRTSPStream@0x7f5f4804ade0> failed to allocate UDP ports with requested transport settings</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> In alloc_ports_one_family(..), the rtp and rtcp socket are binded to multicast address and port by g_socket_bind(..) with [allow_reuse] = FALSE.</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> I'm wondering why it have to bind socket to multicast address and port which is used for sending.</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards,</span></p>
<p class="MsoNormal"><span lang="EN-US">Bruce<span style="color:rgb(31,73,125)"></span></span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
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</blockquote></div><br clear="all"><br>-- <br><div dir="ltr" class="gmail_signature">g. Marc</div>