<html><head></head><body><div style="color:#000; background-color:#fff; font-family:標楷體, dfkai-sb;font-size:16px"><div id="yui_3_16_0_ym19_1_1503904573004_2887"><font id="yui_3_16_0_ym19_1_1503904573004_3357" face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif" size="2">Hello Martin,</font></div><div id="yui_3_16_0_ym19_1_1503904573004_3028"><br></div><div id="yui_3_16_0_ym19_1_1503904573004_3029"><font id="yui_3_16_0_ym19_1_1503904573004_3131" face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif" size="2">After struggling a while, I finally decide to use a different approach, which is using a gstreamer pipeline to record a video from the USB camera data, using a hardware encoder.</font></div><div id="yui_3_16_0_ym19_1_1503904573004_3279"><font id="yui_3_16_0_ym19_1_1503904573004_3131" face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif" size="2">I think it will be the best and simple approach.</font></div><div id="yui_3_16_0_ym19_1_1503904573004_3280"><br></div><div id="yui_3_16_0_ym19_1_1503904573004_3289"><font id="yui_3_16_0_ym19_1_1503904573004_3131" face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif" size="2">Thank you for your help.</font></div><div id="yui_3_16_0_ym19_1_1503904573004_3326"><font id="yui_3_16_0_ym19_1_1503904573004_3131" face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif" size="2">Regards,<br></font></div><div id="yui_3_16_0_ym19_1_1503904573004_3281"><font id="yui_3_16_0_ym19_1_1503904573004_3131" face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif" size="2">Simon<br></font></div><div id="yui_3_16_0_ym19_1_1503904573004_2888"><br></div><div id="yui_3_16_0_ym19_1_1503904573004_2895"><span></span></div> <div class="qtdSeparateBR"><br><br></div><div style="display: block;" class="yahoo_quoted"> <div style="font-family: 標楷體, dfkai-sb; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font face="Arial" size="2"> El Viernes 25 de agosto de 2017 13:34, Martin Vachovski <Martin.Vachovski@skytek.com> escribió:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv1051662339"><style type="text/css">#yiv1051662339 #yiv1051662339 -- p {margin-top:0px;margin-bottom:0px;}#yiv1051662339 -- p {margin-top:0px;margin-bottom:0px;}#yiv1051662339 </style><div dir="ltr">
<div>Hi Simon,<br clear="none">
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<div>>>> <span style="font-family:HelveticaNeue,;">Thank you for your suggestion, however, it still fails, and no error is reported.</span><br clear="none">
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<div>If you're running the pipeline from a C/C++ program, you can pass the --gst-debug-level option to the</div>
<div>gst_init()<br clear="none">
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<div>function<br clear="none">
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<div><span style="white-space:pre;"></span>int argc = 3;</div>
<div><span style="white-space:pre;"></span>char **argv = new char*[argc];</div>
<div><span style="white-space:pre;"></span>argv[0] = "appname";</div>
<div><span style="white-space:pre;"></span>argv[1] = "--gst-debug-level=X";</div>
<div><span style="white-space:pre;"></span>argv[2] = "--gst-debug-no-color";</div>
<div><br clear="none">
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<div><span style="white-space:pre;"></span>gst_init(&argc, &argv);<br clear="none">
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<div><br clear="none">
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<div><span style="font-family:Calibri, Arial, Helvetica, sans-serif;font-size:16px;background-color:rgb(255, 255, 255);">where X is a number from 0 to 9, 9 being the highest level- then you'll see a lot of errors on stderr (even overwhelming)</span><br clear="none">
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<div>Anyway, recently I managed to make the following pipeline work:<br clear="none">
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<div>"appsrc name=appsrc_element block=true format=3 ! video/x-raw,format=YUY2,width=320,height=240,framerate=30/1 ! "</div>
<div><span style="white-space:pre;"></span>"videoconvert ! x264enc tune=zerolatency bitrate=4096 ! video/x-h264,profile=\"high-4:4:4\" ! rtph264pay ! udpsink host=192.168.168.98 port=10000"<br clear="none">
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<div><br clear="none">
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<div>It does something similar to what you're trying to achieve- only transmits over the network instead of saving to a file.<br clear="none">
</div>
<div>As an advice try first replacing the whole H264 encoding part with a autovideosink- that way you'll</div>
<div>make sure that the video you import from the <strong>appsrc</strong> is working, something like:<br clear="none">
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<div style="font-family:Calibri, Arial, Helvetica, sans-serif;font-size:16px;background-color:rgb(255, 255, 255);">
"appsrc name=appsrc_element block=true format=3 ! video/x-raw,format=YUY2,width=320,height=240,framerate=30/1 ! "</div>
<div style="font-family:Calibri, Arial, Helvetica, sans-serif;font-size:16px;background-color:rgb(255, 255, 255);">
<span style="white-space:pre;"></span>"videoconvert ! <strong>autovideosink</strong>"<br clear="none">
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<br clear="none">
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<div>When this pipeline works, proceed with adding more elements<br clear="none">
</div>
<div><br clear="none">
</div>
Hope that helps<br clear="none">
</div>
<div>Martin<br clear="none">
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<div class="yiv1051662339yqt7310831247" id="yiv1051662339yqt37033"><div style="color:rgb(33, 33, 33);">
<hr tabindex="-1" style="display:inline-block;width:98%;">
<div dir="ltr" id="yiv1051662339divRplyFwdMsg"><font style="font-size:11pt;" color="#000000" face="Calibri, sans-serif"><b>From:</b> gstreamer-devel <gstreamer-devel-bounces@lists.freedesktop.org> on behalf of simo zz <simon.zz@yahoo.com><br clear="none">
<b>Sent:</b> Friday, August 25, 2017 12:10 PM<br clear="none">
<b>To:</b> Discussion of the development of and with GStreamer<br clear="none">
<b>Subject:</b> Re: Gstreamer pipeline through OpenCV for H264 encoded video file</font>
<div> </div>
</div>
<div>
<div style="color:#000;background-color:#fff;font-family:標楷體, dfkai-sb;font-size:16px;">
<div id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_46043"><font face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif" size="2">Hello Martin,</font></div>
<div id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_46046"><br clear="none">
</div>
<div id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_46179"><font id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_46417" face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif" size="2">Thank you for your suggestion, however, it still fails, and no error
is reported.</font></div>
<div><font id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_46417" face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif" size="2"><br clear="none">
</font></div>
<div id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_46398"><font face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif" size="2">Regards,</font></div>
<div id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_46440"><font face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif" size="2">Simon<br clear="none">
</font></div>
<div id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_45955"></div>
<div class="yiv1051662339qtdSeparateBR"><br clear="none">
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<div class="yiv1051662339yahoo_quoted" style="display:block;">
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<div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;">
<div dir="ltr"><font face="Arial" size="2">El Viernes 25 de agosto de 2017 12:13, Martin Vachovski <Martin.Vachovski@skytek.com> escribió:<br clear="none">
</font></div>
<br clear="none">
<br clear="none">
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#yiv1051662339 #yiv1051662339 --
-- p
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#yiv1051662339
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<div>Sorry... didn't mean to omit the autovideoconvert...<br clear="none">
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<div><br clear="none">
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<div>The pipeline I meant is to be read:<br clear="none">
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<div><br clear="none">
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<div><span style="font-family:Calibri, Arial, Helvetica, sans-serif;font-size:16px;background-color:rgb(255,255,255);">appsrc ! </span><strong style="font-family:Calibri, Arial, Helvetica, sans-serif;font-size:16px;background-color:rgb(255,255,255);">video/x-raw,format=YUY2,width=320,height=240,framerate=30/1</strong><span style="font-family:Calibri, Arial, Helvetica, sans-serif;font-size:16px;background-color:rgb(255,255,255);"> <span style="font-family:Calibri, Arial, Helvetica, sans-serif;font-size:16px;background-color:rgb(255,255,255);">!</span><span style="font-family:Calibri, Arial, Helvetica, sans-serif;font-size:16px;background-color:rgb(255,255,255);"> </span><strong style="font-family:Calibri, Arial, Helvetica, sans-serif;font-size:16px;background-color:rgb(255,255,255);">autovideoconvert </strong>! v4l2video1h264enc
....</span><br clear="none">
</div>
<div><span style="font-family:Calibri, Arial, Helvetica, sans-serif;font-size:16px;background-color:rgb(255,255,255);"><br clear="none">
</span></div>
<div><span style="font-family:Calibri, Arial, Helvetica, sans-serif;font-size:16px;background-color:rgb(255,255,255);">Cheers</span></div>
<div><span style="font-family:Calibri, Arial, Helvetica, sans-serif;font-size:16px;background-color:rgb(255,255,255);">Martin</span></div>
<div><br clear="none">
</div>
<div class="yiv1051662339yqt0756782030" id="yiv1051662339yqt80663">
<div dir="ltr" style="font-size:12pt;color:#000000;background-color:#FFFFFF;font-family:Calibri, Arial, Helvetica, sans-serif;">
<hr tabindex="-1" style="display:inline-block;width:98%;">
<div dir="ltr" id="yiv1051662339divRplyFwdMsg"><font style="font-size:11pt;" color="#000000" face="Calibri, sans-serif"><b>From:</b> gstreamer-devel <gstreamer-devel-bounces@lists.freedesktop.org> on behalf of Martin Vachovski <Martin.Vachovski@skytek.com><br clear="none">
<b>Sent:</b> Friday, August 25, 2017 11:09 AM<br clear="none">
<b>To:</b> gstreamer-devel@lists.freedesktop.org; simo zz<br clear="none">
<b>Subject:</b> Re: Gstreamer pipeline through OpenCV for H264 encoded video file</font>
<div> </div>
</div>
<div>
<div>One quick thing I can suggest is to try to specify the CAPS before the autovideoconvert element.<br clear="none">
</div>
<div>Otherwise there might be problems with the negotiation and starting of the pipeline<br clear="none">
</div>
<div>something like:<br clear="none">
</div>
<div><br clear="none">
</div>
<div>appsrc ! <strong>video/x-raw,format=YUY2,width=320,height=240,framerate=30/1</strong> ! v4l2video1h264enc ....<br clear="none">
</div>
<div><br clear="none">
</div>
<div>Or whatever format you're getting the videoframes in from the appsrc, try to specify as many details as possible<br clear="none">
</div>
<div><br clear="none">
</div>
<div>Cheers<br clear="none">
</div>
<div>Martin<br clear="none">
</div>
<div><br clear="none">
</div>
<div style="color:rgb(33,33,33);">
<hr tabindex="-1" style="display:inline-block;width:98%;">
<div dir="ltr" id="yiv1051662339divRplyFwdMsg"><font style="font-size:11pt;" color="#000000" face="Calibri, sans-serif"><b>From:</b> gstreamer-devel <gstreamer-devel-bounces@lists.freedesktop.org> on behalf of simo zz <simon.zz@yahoo.com><br clear="none">
<b>Sent:</b> Friday, August 25, 2017 10:58 AM<br clear="none">
<b>To:</b> gstreamer-devel@lists.freedesktop.org<br clear="none">
<b>Subject:</b> Gstreamer pipeline through OpenCV for H264 encoded video file</font>
<div> </div>
</div>
<div>
<div style="color:#000;background-color:#fff;font-family:標楷體, dfkai-sb;font-size:16px;">
<div id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_17294"><font id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_17639" face="verdana, helvetica, sans-serif" size="2">Hi all,</font></div>
<div id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_33994"><font id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_17639" face="verdana, helvetica, sans-serif" size="2"><br clear="none">
</font></div>
<div dir="ltr" id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_17512"><font id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_17642" face="verdana, helvetica, sans-serif" size="2">I am working on an IP application working with OpenCV and I need to generate
an H264 encoded videos.</font></div>
<div dir="ltr" id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_18104"><font id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_18283" face="verdana, helvetica, sans-serif" size="2">OpenCV uses GStramer to for this task, initializing the OpenCV
<b id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_33730">VideoWriter</b> object with a
</font><font id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_18284" face="verdana, helvetica, sans-serif" size="2">GStramer pipeline. In turns it should passthe frames GStramer which should write the video..<br clear="none">
</font></div>
<div dir="ltr" id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_26378"><br clear="none">
</div>
<div dir="ltr" id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_26380"><font id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_18284" face="verdana, helvetica, sans-serif" size="2">The actual pipeline I am using for this task:</font></div>
<div dir="ltr" id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_33595"><br clear="none">
</div>
<div dir="ltr" id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_33597"><font id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_18284" face="verdana, helvetica, sans-serif" size="2">"<b id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_33727">appsrc ! autovideoconvert
! v4l2video1h264enc extra-controls=\"encode,h264_level=10,h264_profile=4,frame_level_rate_control_enable=1,video_bitrate=2000000\" ! h264parse ! rtph264pay config-interval=1 pt=96 ! filesink location=file.pm4</b>"<br clear="none">
</font></div>
<div dir="ltr" id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_26208"><br clear="none">
</div>
<div dir="ltr" id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_33888"><font id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_18284" face="verdana, helvetica, sans-serif" size="2">But it's neither generating the video. I tried many pipelines without successful
results..</font></div>
<div dir="ltr" id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_33998"><font id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_18284" face="verdana, helvetica, sans-serif" size="2">What is the correct pipeline I must use ?</font></div>
<div dir="ltr" id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_34061"><font id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_18284" face="verdana, helvetica, sans-serif" size="2"><br clear="none">
</font></div>
<div dir="ltr" id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_34000"><font id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_18284" face="verdana, helvetica, sans-serif" size="2">Thank you in advance,</font></div>
<div dir="ltr" id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_34002"><font id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_18284" face="verdana, helvetica, sans-serif" size="2">Regards,</font></div>
<div dir="ltr" id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_34004"><font id="yiv1051662339yui_3_16_0_ym19_1_1503645999210_18284" face="verdana, helvetica, sans-serif" size="2">Simon<br clear="none">
</font></div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
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