<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_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></body></html>