<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style type="text/css" style="display:none"></style> </head> <body dir="ltr" style="font-size:12pt;color:#000000;background-color:#FFFFFF;font-family:Calibri,Arial,Helvetica,sans-serif;"> <p>One quick thing I can suggest is to try to specify the CAPS before the autovideoconvert element.<br> </p> <p>Otherwise there might be problems with the negotiation and starting of the pipeline<br> </p> <p>something like:<br> </p> <p><br> </p> <p>appsrc ! <strong>video/x-raw,format=YUY2,width=320,height=240,framerate=30/1</strong> ! v4l2video1h264enc ....<br> </p> <p><br> </p> <p>Or whatever format you're getting the videoframes in from the appsrc, try to specify as many details as possible<br> </p> <p><br> </p> <p>Cheers<br> </p> <p>Martin<br> </p> <p><br> </p> <div style="color: rgb(33, 33, 33);"> <hr tabindex="-1" style="display:inline-block; width:98%"> <div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> gstreamer-devel <gstreamer-devel-bounces@lists.freedesktop.org> on behalf of simo zz <simon.zz@yahoo.com><br> <b>Sent:</b> Friday, August 25, 2017 10:58 AM<br> <b>To:</b> gstreamer-devel@lists.freedesktop.org<br> <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="yui_3_16_0_ym19_1_1503645999210_17294"><font id="yui_3_16_0_ym19_1_1503645999210_17639" face="verdana, helvetica, sans-serif" size="2">Hi all,</font></div> <div id="yui_3_16_0_ym19_1_1503645999210_33994"><font id="yui_3_16_0_ym19_1_1503645999210_17639" face="verdana, helvetica, sans-serif" size="2"><br> </font></div> <div dir="ltr" id="yui_3_16_0_ym19_1_1503645999210_17512"><font id="yui_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 id="yui_3_16_0_ym19_1_1503645999210_18104" dir="ltr"><font id="yui_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="yui_3_16_0_ym19_1_1503645999210_33730">VideoWriter</b> object with a </font> <font id="yui_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> </font></div> <div id="yui_3_16_0_ym19_1_1503645999210_26378" dir="ltr"><br> </div> <div id="yui_3_16_0_ym19_1_1503645999210_26380" dir="ltr"><font id="yui_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 id="yui_3_16_0_ym19_1_1503645999210_33595" dir="ltr"><br> </div> <div id="yui_3_16_0_ym19_1_1503645999210_33597" dir="ltr"><font id="yui_3_16_0_ym19_1_1503645999210_18284" face="verdana, helvetica, sans-serif" size="2">"<b id="yui_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> </font></div> <div id="yui_3_16_0_ym19_1_1503645999210_26208" dir="ltr"><br> </div> <div id="yui_3_16_0_ym19_1_1503645999210_33888" dir="ltr"><font id="yui_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 id="yui_3_16_0_ym19_1_1503645999210_33998" dir="ltr"><font id="yui_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 id="yui_3_16_0_ym19_1_1503645999210_34061" dir="ltr"><font id="yui_3_16_0_ym19_1_1503645999210_18284" face="verdana, helvetica, sans-serif" size="2"><br> </font></div> <div id="yui_3_16_0_ym19_1_1503645999210_34000" dir="ltr"><font id="yui_3_16_0_ym19_1_1503645999210_18284" face="verdana, helvetica, sans-serif" size="2">Thank you in advance,</font></div> <div id="yui_3_16_0_ym19_1_1503645999210_34002" dir="ltr"><font id="yui_3_16_0_ym19_1_1503645999210_18284" face="verdana, helvetica, sans-serif" size="2">Regards,</font></div> <div id="yui_3_16_0_ym19_1_1503645999210_34004" dir="ltr"><font id="yui_3_16_0_ym19_1_1503645999210_18284" face="verdana, helvetica, sans-serif" size="2">Simon<br> </font></div> </div> </div> </div> </body> </html>