<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=us-ascii">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@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;}
@font-face
{font-family:Verdana;
panose-1:2 11 6 4 3 5 4 4 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;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;
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:147284370;
mso-list-template-ids:-120053250;}
@list l0:level1
{mso-level-number-format:bullet;
mso-level-text:\F0B7;
mso-level-tab-stop:36.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Symbol;}
@list l0:level2
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:72.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:"Courier New";
mso-bidi-font-family:"Times New Roman";}
@list l0:level3
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:108.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l0:level4
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:144.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l0:level5
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:180.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l0:level6
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:216.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l0:level7
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:252.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l0:level8
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:288.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l0:level9
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:324.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
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-AU" link="#0563C1" vlink="#954F72" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-fareast-language:EN-AU">We are having issues sending a 4K, H264 stream through WebRTC on Windows (3840x2160, 30hz, 8Mbs). Playback of the video stream stutters
or may get stuck. Our application captures the desktop, encodes it to H264 and streams it to Chrome or another of our applications, both of which exhibit the problem. This issue only happens on Windows, CentOS7 and Ubuntu20.04 work (using the same hardware).
Lower resolutions (1080P) work across all 3 operations systems. Chrome's webrtc-internals shows the packetsLost or freezeCount increase when the stutter occurs.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-fareast-language:EN-AU">Points of note:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="mso-fareast-language:EN-AU">Our GStreamer version is 1.19.1.<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="mso-fareast-language:EN-AU">This was reproduced with two PCs on a local network. The problem won't occur if the sender and receiver are on the same computer.<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="mso-fareast-language:EN-AU">We did some Wireshark captures on the sending PC and it showed some packets aren't making it to the NIC. It appears occasionally a NAL is being truncated.<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="mso-fareast-language:EN-AU">In attempt reduced the scope of the problem, I reproduced the issue in one of the gst-examples (webrtc\sendonly\webrtc-unidirectional-h264.c) by modifying the pipeline to stream from a file (I only tested this on Windows).
The file is 30hz, 4K H264 video with a birate of 8 Mbs. The pipeline looks like this
<o:p></o:p></span></li><ul type="circle">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo1">
<i><span style="mso-fareast-language:EN-AU">filesrc location=C:\tmp\test.mkv ! queue ! matroskademux ! queue ! h264parse ! video/x-h264,alignment=au,stream-format=byte-stream ! rtph264pay config-interval=1 aggregate-mode ! application/x-rtp,media=video,encoding-name=H264,encoding-payload=96
! webrtcbin</span></i><span style="mso-fareast-language:EN-AU"><o:p></o:p></span></li></ul>
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="mso-fareast-language:EN-AU">Reducing the bitrate alleviates the problem.<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="mso-fareast-language:EN-AU">For reference this is our application's pipeline on Windows
<o:p></o:p></span></li><ul type="circle">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo1">
<i><span style="mso-fareast-language:EN-AU">dxgiscreencapsrc cursor=true ! video/x-raw,format=BGRA,framerate=30/1 ! videoconvert ! queue ! video/x-raw,format=I420 ! nvh264enc preset=low-latency-hp bitrate=8192 rc-mode=cbr gop-size=90 zerolatency=true ! video/x-h264,framerate=30/1,alignment=au,stream-format=byte-stream
! rtph264pay ! application/x-rtp,media=video,encoding-name=H264,payload=96 ! webrtcbin</span></i><span style="mso-fareast-language:EN-AU"><o:p></o:p></span></li></ul>
</ul>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-fareast-language:EN-AU">As I was able to reproduce the issue in the modified example it points to webrtcbin as the problem.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-fareast-language:EN-AU">Any help/suggestions to resolve the problem would be greatly appreciated.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-fareast-language:EN-AU">Thanks<o:p></o:p></span></p>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="100%" style="width:100.0%">
<tbody>
<tr>
<td style="padding:1.5pt 1.5pt 1.5pt 1.5pt">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1A355E;mso-fareast-language:EN-AU">David Ely</span></b><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1A355E;mso-fareast-language:EN-AU">
<br>
</span><span style="font-size:8.5pt;font-family:"Verdana",sans-serif;color:#1A355E;mso-fareast-language:EN-AU">Software Architect</span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1A355E;mso-fareast-language:EN-AU">
</span><span style="mso-fareast-language:EN-AU"><o:p></o:p></span></p>
</td>
</tr>
<tr>
<td style="padding:4.5pt 1.5pt 3.0pt 1.5pt">
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU"><img width="200" height="29" style="width:2.0833in;height:.302in" id="_x0000_i1025" src="https://gallery.mailchimp.com/73a7af9caf823e17148efa426/images/399deeaf-a8bb-4b99-a868-deb57d655bb6.png" alt="ImmersaView"></span><span style="mso-fareast-language:EN-AU"><o:p></o:p></span></p>
</td>
</tr>
<tr>
<td style="padding:1.5pt 1.5pt 1.5pt 1.5pt">
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="100%" style="width:100.0%">
<tbody>
<tr>
<td width="5" style="width:3.75pt;padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="font-size:8.5pt;font-family:"Verdana",sans-serif;color:#1F9BDE;mso-fareast-language:EN-AU">T</span></b><span style="mso-fareast-language:EN-AU"><o:p></o:p></span></p>
</td>
<td style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Verdana",sans-serif;color:#1A355E;mso-fareast-language:EN-AU"> +61 7 3123 7133</span><span style="mso-fareast-language:EN-AU"><o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width="5" style="width:3.75pt;padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="font-size:8.5pt;font-family:"Verdana",sans-serif;color:#1F9BDE;mso-fareast-language:EN-AU">E</span></b><span style="mso-fareast-language:EN-AU"><o:p></o:p></span></p>
</td>
<td style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Verdana",sans-serif;color:#1A355E;mso-fareast-language:EN-AU"> <a href="mailto:david.ely@immersaview.com"><span style="color:#1F9BDE">david.ely@immersaview.com</span></a></span><span style="mso-fareast-language:EN-AU"><o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width="5" style="width:3.75pt;padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="font-size:8.5pt;font-family:"Verdana",sans-serif;color:#1F9BDE;mso-fareast-language:EN-AU">W</span></b><span style="mso-fareast-language:EN-AU"><o:p></o:p></span></p>
</td>
<td style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Verdana",sans-serif;color:#1A355E;mso-fareast-language:EN-AU"> <a href="http://www.immersaview.com/" target="_blank"><span style="color:#1F9BDE">www.immersaview.com</span></a></span><span style="mso-fareast-language:EN-AU"><o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width="5" style="width:3.75pt;padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="font-size:8.5pt;font-family:"Verdana",sans-serif;color:#1F9BDE;mso-fareast-language:EN-AU">A</span></b><span style="mso-fareast-language:EN-AU"><o:p></o:p></span></p>
</td>
<td style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Verdana",sans-serif;color:#1A355E;mso-fareast-language:EN-AU"> 13/67 Depot St, Banyo, QLD 4014</span><span style="mso-fareast-language:EN-AU"><o:p></o:p></span></p>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
<tr>
<td style="padding:1.5pt 1.5pt 1.5pt 1.5pt">
<p class="MsoNormal"><span style="font-size:7.0pt;font-family:"Verdana",sans-serif;color:#1A355E;mso-fareast-language:EN-AU">This electronic mail transmission is confidential and is intended only for the review of the party to whom it is addressed.
</span><span style="mso-fareast-language:EN-AU"><o:p></o:p></span></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>