<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0cm;
margin-right:0cm;
margin-bottom:0cm;
margin-left:36.0pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
/* List Definitions */
@list l0
{mso-list-id:1492018471;
mso-list-type:hybrid;
mso-list-template-ids:-589518768 134807569 134807577 134807579 134807567 134807577 134807579 134807567 134807577 134807579;}
@list l0:level1
{mso-level-text:"%1\)";
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level2
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level3
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
@list l0:level4
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level5
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level6
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
@list l0:level7
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level8
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level9
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
ol
{margin-bottom:0cm;}
ul
{margin-bottom:0cm;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="en-RU" link="#0563C1" vlink="#954F72" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US">Hi all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="mso-fareast-language:EN-GB">I am using GStreamer to create a video file from a pcap dump file that contains RTP traffic of SIP calls (2 or 2+ legs).</span><span lang="EN" style="mso-fareast-language:EN-GB">
</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">For example,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">“call123-media.pcap” with 2 legs contains only SIP call media (OPUS + VP8 RTP packets).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Pcap captured on one server.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Every leg has 1 audio + 2 video (videoIN + videoOUT) streams.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="mso-fareast-language:EN-GB">Streams start and end at the same time (after trimming the pcap file</span><span lang="EN-US">).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="mso-fareast-language:EN-GB">I am using the following pipeline for converting</span><span lang="EN-US">:</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span lang="EN-US">gst-launch-1.0 videomixer name=m background=1 \<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> sink_0::xpos=0 sink_0::ypos=0 sink_0::width=640 sink_0::height=480 \<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> sink_1::xpos=640 sink_1::ypos=0 sink_1::width=640 sink_1::height=480 ! queue ! x264enc tune=zerolatency pass=17 bitrate=768 ! queue \<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> ! mp4mux name=avMux faststart=true ! queue ! filesink location=call123-media.mp4 \<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> rtpbin name=rtpbin \<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> filesrc location=call123-media.pcap ! queue ! tee name=pcapTee \<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> pcapTee. ! queue ! pcapparse src-port=16242 ! application/x-rtp,media=audio,clock-rate=48000,encoding-name=OPUS ! rtpbin. \<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> pcapTee. ! queue ! pcapparse src-port=17234 ! application/x-rtp,media=audio,clock-rate=48000,encoding-name=OPUS ! rtpbin. \<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> pcapTee. ! queue ! pcapparse src-port=16268 ! application/x-rtp,media=video,clock-rate=90000,encoding-name=VP8 ! rtpbin. \<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> pcapTee. ! queue ! pcapparse src-port=17254 ! application/x-rtp,media=video,clock-rate=90000,encoding-name=VP8 ! rtpbin. \<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> \<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> rtpbin. ! rtpjitterbuffer ! rtpopusdepay ! opusdec ! audioconvert ! avenc_aac ! avMux.audio_0 \<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> rtpbin. ! rtpjitterbuffer ! rtpopusdepay ! opusdec ! audioconvert ! avenc_aac ! avMux.audio_1 \<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> rtpbin. ! rtpjitterbuffer ! rtpvp8depay ! vp8dec ! videoscale ! video/x-raw,width=640,height=480 ! m. \<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> rtpbin. ! rtpjitterbuffer ! rtpvp8depay ! vp8dec ! videoscale ! video/x-raw,width=640,height=480 ! m.<o:p></o:p></span></i></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="mso-fareast-language:EN-GB">As a result, I get two video streams, where the first is not started simultaneously with the second.</span><span lang="EN" style="mso-fareast-language:EN-GB">
</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="mso-fareast-language:EN-GB">I am getting following results:</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN" style="mso-fareast-language:EN-GB">the first stream starts 5 seconds after the start of the second (5 seconds of black screen)</span><span lang="EN-US" style="mso-fareast-language:EN-GB"><o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN" style="mso-fareast-language:EN-GB">the second stream ends 5 seconds after the end of the first</span><span lang="EN" style="mso-fareast-language:EN-GB">
</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-US">video streams are not synchronous</span><span lang="EN-US" style="mso-fareast-language:EN-GB"><o:p></o:p></span></li></ol>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">What wrong with my pipeline?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">How can I fix that?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="mso-fareast-language:EN-GB">I tried adding queues but it didn't help.</span><span lang="EN" style="mso-fareast-language:EN-GB">
</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal"><span lang="EN-US" style="color:black;mso-fareast-language:EN-GB">-- <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:EN-GB">Thanks in advance</span><span lang="EN-US" style="font-size:12.0pt;color:black;mso-fareast-language:EN-GB">,<o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-GB">Alexander</span></b><span style="font-size:12.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>