<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><blockquote type="cite">I am using the RTSP client of Live555 in my application. The purpose is to support CableCARD tuners. I got it working for some devices (such as Ceton InfiniTV) but encountered a problem with SiliconDust's HDHomeRun PRIME. What I found out (and also confirmed by SiliconDust support) is that the device sends a value of 96 for payload type in the SDP description, like the following,<br><br>v=0<br>t=0 0<br>a=type:broadcast<br>a=recvonly<br>m=video 0 RTP/AVP 96<br>a=rtpmap:96 MP2T/27000000<br><br>but when the actual video is streamed, the type is of value 33.<br></blockquote><div><br></div>This is clearly an error in the server (the "SiliconDust's HDHomeRun PRIME"). It is advertising that its RTP packets are using RTP payload format code 96 - which is wrong - and using a RTP timestamp frequency of 27000000 - which is probably also wrong. (MPEG Transport Stream packets are usually streamed in RTP with a standard RTP timestamp frequency of 90000.)</div><div><br></div><div>The server needs to be fixed, because it is advertising a stream that it is not providing. </div><div><br></div><div>Instead of these SDP lines:</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>m=video 0 RTP/AVP 96</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>a=rtpmap:96 MP2T/27000000</div><div>The server should be fixed so that it sends just:</div><div><div><span class="Apple-tab-span" style="white-space: pre; "> </span>m=video 0 RTP/AVP 33</div><div>because "33" is a static RTP payload format code, defined specifically to mean: streaming MPEG Transport Stream data at frequency 90000.</div><div>Or, if the server really is using a nonstandard RTP timestamp frequency of 27000000 (which is unlikely, but conceivable), then it should send:</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>m=video 0 RTP/AVP 33/27000000</div><div><br></div><div>Please contact "SiliconDust" to tell them to fix their server, and suggest that - in the future - they use our free RTSP client applications "testRTSPClient" and "openRTSP" to test their RTSP implementation.</div></div><br><br><div apple-content-edited="true">
<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; font-size: medium; "><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; font-size: medium; ">Ross Finlayson<br>Live Networks, Inc.<br><a href="http://www.live555.com/">http://www.live555.com/</a></span></span>
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