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<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m using GStreamer RTSP v1.14.4 to create an H.264 encoded stream from the Raspberry Pi camera module v2.1 using a Raspberry Pi v3B. I’m hardware accelerating the encoding using the OpenMax IL element omxh264enc.<o:p></o:p></p>
<p class="MsoNormal">The problem is that at resolution 800x600@30 fps, the last 40 rows of each frame have a pattern of corruption.<o:p></o:p></p>
<p class="MsoNormal">My pipeline is:<o:p></o:p></p>
<p class="MsoNormal">“v4l2src ! capsfilter caps=video/x-raw,width=800,height=600,framerate=(fraction)30/1 ! videoconvert ! omxh264enc target-bitrate=1000000 control-rate=variable ! capsfilter caps=video/x-h264,profile=high ! rtph264pay name=pay0 pt=96”<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The Pi is running Ubuntu MATE 16.04 LTS with up-to-date firmware:<o:p></o:p></p>
<p class="MsoNormal">$ /opt/vc/bin/vcgencmd version<o:p></o:p></p>
<p class="MsoNormal">Oct 15 2018 17:24:22<o:p></o:p></p>
<p class="MsoNormal">Copyright (c) 2012 Broadcom<o:p></o:p></p>
<p class="MsoNormal">version 90bb730cc70ffe95957061587b4d07e26842a4f8 (clean) (release)<o:p></o:p></p>
<p class="MsoNormal">$ uname -a<o:p></o:p></p>
<p class="MsoNormal">Linux pi-iot3 4.14.76-v7+ #1150 SMP Mon Oct 15 15:19:23 BST 2018 armv7l armv7l armv7l GNU/Linux<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve tried other firmware versions including the latest stable (apt-get) firmware/kernel:<o:p></o:p></p>
<p class="MsoNormal">$ /opt/vc/bin/vcgencmd version<o:p></o:p></p>
<p class="MsoNormal">Dec 9 2016 15:15:20<o:p></o:p></p>
<p class="MsoNormal">Copyright (c) 2012 Broadcom<o:p></o:p></p>
<p class="MsoNormal">version 2e557d8dac70add28597c3b449cb52c34588d818 (clean) (release)<o:p></o:p></p>
<p class="MsoNormal">$ uname -a<o:p></o:p></p>
<p class="MsoNormal">Linux pi-iot5 4.4.38-v7+ #938 SMP Thu Dec 15 15:22:21 GMT 2016 armv7l armv7l armv7l GNU/Linux<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">And:<o:p></o:p></p>
<p class="MsoNormal">$ /opt/vc/bin/vcgencmd version<o:p></o:p></p>
<p class="MsoNormal">Jun 7 2018 15:37:30<o:p></o:p></p>
<p class="MsoNormal">Copyright (c) 2012 Broadcom<o:p></o:p></p>
<p class="MsoNormal">version 4800f08a139d6ca1c5ecbee345ea6682e2160881 (clean) (release)<o:p></o:p></p>
<p class="MsoNormal">$ uname -a<o:p></o:p></p>
<p class="MsoNormal">Linux pi-iot3 4.14.50-v7+ #1121 SMP Mon Jun 18 16:29:47 BST 2018 armv7l armv7l armv7l GNU/Linux<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">But they don’t make any difference.<o:p></o:p></p>
<p class="MsoNormal">What does work is different resolutions as follows:<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo3">800x600 bad<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo3">1280x800 fine<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo3">640x600 fine<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo3">1280x200 fine<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo3">860x600 bad<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo3">960x600 almost perfect<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo3">940x400 fine<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Can anybody advise of a way to avoid this issue or at least a way to calculate what resolutions will be fine?<o:p></o:p></p>
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