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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">Hi all,
</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">Thanks for your quickly reply.
</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">Actually , the two frame sequence number is the same , but H264 data is different, and I notice checksum of UDP is the same too, please look
details via attached two JPG document. </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">I draw my test network flow chart as below, port1 and port3 are
</span><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#C00000">port mirroring</span><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> . all packets are captured by WIRESHARK.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
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<td rowspan="2" align="left" valign="top"><img width="385" height="87" src="cid:image007.png@01CD5611.AAE94720" alt="Description: port 1 port 2
port3 cisco switch
,Description: live555,Description: wireshark"></td>
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<td align="left" valign="top"><img width="113" height="32" src="cid:image008.png@01CD5611.AAE94720" alt="Description: vlc/quicktime"></td>
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</span><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">My version detail is as below
</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">#define LIVEMEDIA_LIBRARY_VERSION_STRING "2010.08.22"</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">#define LIVEMEDIA_LIBRARY_VERSION_INT 1282435200</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"><img width="1342" height="156" id="Picture_x0020_10" src="cid:image011.png@01CD5611.AAE94720" alt="Description: Description: cid:image001.png@01CD44BD.83193F30"></span><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"></span></p>
<p class="MsoNormal" style="text-align:justify; text-justify:inter-ideograph"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">Thanks</span></p>
<p class="MsoNormal" style="text-align:justify; text-justify:inter-ideograph"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">Mark Wang</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal" style="text-align:justify; text-justify:inter-ideograph"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">Thanks</span></p>
<p class="MsoNormal" style="text-align:justify; text-justify:inter-ideograph"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">Mark Wang</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
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<p class="MsoNormal" style="text-align:justify; text-justify:inter-ideograph"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">Thanks</span></p>
<p class="MsoNormal" style="text-align:justify; text-justify:inter-ideograph"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">Mark Wang</span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif""> live-devel-bounces@ns.live555.com [mailto:live-devel-bounces@ns.live555.com]
<b>On Behalf Of </b>Ross Finlayson<br>
<b>Sent:</b> 2012</span><span style="font-size:10.0pt; font-family:宋体">年</span><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">6</span><span style="font-size:10.0pt; font-family:宋体">月</span><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">27</span><span style="font-size:10.0pt; font-family:宋体">日</span><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">
12:44<br>
<b>To:</b> LIVE555 Streaming Media - development & use<br>
<b>Subject:</b> Re: [Live-devel] live55 rtp sequence number is duplicate</span></p>
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<p class="MsoNormal"><span lang="EN-US"> </span></p>
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<p class="MsoNormal" style="text-align:justify; text-justify:inter-ideograph"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"">My OS is LINUX<span class="apple-converted-space"> </span><span style="color:#1F497D">2.6.37, I send
h264 and MJPEG data to VLC or QUICKTIME by live555, sometimes I can see live555 RTP sequence is duplicate, I capture some packets by tool WIRESHARK , these packets is as below</span></span></p>
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<p class="MsoNormal"><span lang="EN-US"> </span></p>
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<p class="MsoNormal"><span lang="EN-US">These are almost certainly duplicate packets - not distinct packets that happen to have the same RTP sequence number (because the LIVE555 RTP transmitting code always increments the sequence number each time it sends
a packet).</span></p>
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<p class="MsoNormal"><span lang="EN-US"> </span></p>
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<p class="MsoNormal"><span lang="EN-US">This packet duplication could be happing somewhere on your network (e.g., by a router), or perhaps in the sender or receiver's operating system. But it's definitely not happening in our code.</span></p>
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<p class="MsoNormal"><span lang="EN-US"> </span></p>
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<p class="MsoNormal"><span lang="EN-US">In any case, this shouldn't be a problem, because the RTP receiver will check the sequence numbers, and automatically discard any duplicate packets. Ditto if packets get reordered on the network (which can also happen).
That's the purpose of the RTP sequence number.</span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US"> </span></p>
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<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:13.5pt; font-family:"Helvetica","sans-serif"; color:black">Ross Finlayson</span></span><span lang="EN-US" style="font-size:13.5pt; font-family:"Helvetica","sans-serif"; color:black"><br>
<span class="apple-style-span">Live Networks, Inc.</span><br>
<span class="apple-style-span"><a href="http://www.live555.com/">http://www.live555.com/</a></span></span><span lang="EN-US">
</span></p>
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<p class="MsoNormal"><span lang="EN-US"> </span></p>
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