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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Hello,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Did you recompile according to the release notes? Are you using the pipeline shown in the release notes?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>To know what is being done by gstreamer, you should copy paste the exact pipeline you are using.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>The release notes show this pipeline<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>gst-launch-1.0 -e v4l2src device=/dev/video3 ! video/x-raw,format=NV12,width=1280,height=960 ! v4l2h264enc extra-controls="controls,h264_profile=4,video_bitrate=2000000;" ! h264parse ! mp4mux ! filesink location=video.mp4<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>It looks like this pipeline is using v4l2h264enc to do the h.264 encoding.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>It is then using a parser and a muxer and a filesink to create an mp4 file. What this does is use an mp4 container that contains an h264 video track.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>It looks like the h264 encoder takes some parameters. You may be able to get better video quality by adjusting the parameters of the h264 encoder. For example, there is typically a “high” setting that can be used for h264 quality. You might also try increasing the bitrate to see if that improves quality. (The height and width dimensions seem odd to me. I would expect something like 1280x720 or 1920x1080)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Rand<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> gstreamer-devel [mailto:gstreamer-devel-bounces@lists.freedesktop.org] <b>On Behalf Of </b>simon.zz@yahoo.com<br><b>Sent:</b> Wednesday, April 25, 2018 4:33 PM<br><b>To:</b> Discussion of the Development of and With GStreamer <gstreamer-devel@lists.freedesktop.org><br><b>Subject:</b> Re: RE: How do gstreamer interfaces with H264 hardware encoders and creates videos ?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'>Hello Rand,<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'>You are right. The board is a Dragonboard 410c by 96boards.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><a href="https://developer.qualcomm.com/hardware/snapdragon-410/tools" target="_blank"><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'>https://developer.qualcomm.com/hardware/snapdragon-410/tools</span></a><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'>96boards in their release notes<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><a href="http://releases.linaro.org/96boards/dragonboard410c/linaro/debian/latest/" target="_blank"><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'>http://releases.linaro.org/96boards/dragonboard410c/linaro/debian/latest/</span></a><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'>write that the gstreamer pipeline uses the video encoder.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'>But as I said before, I noticed notable differences in video results, which make me doubt that gstreamer really uses the encoder..<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'>The C/C++ code I am using is based on this one:<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><a href="https://git.linaro.org/people/stanimir.varbanov/v4l2-decode.git/tree" target="_blank"><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'>stanimir.varbanov/v4l2-decode.git - Unnamed repository</span></a><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'><o:p> </o:p></span></p></div><div id="ydp8a39d818enhancr_card_4929569402"><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0><tr><td width=400 style='width:300.0pt;padding:0in 0in 0in 0in'><table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0 width="100%" style='width:100.0%;border:solid #E0E4E9 1.0pt'><tr><td style='border:none;padding:0in 0in 0in 0in'><table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0 width="100%" style='width:100.0%;background:white;border:none;border-top:solid #E0E4E9 1.0pt'><tr><td valign=top style='border:none;padding:12.0pt 0in 12.0pt 9.0pt'></td><td width="99%" style='width:99.0%;border:none;padding:9.0pt .25in 12.0pt 9.0pt;border-radius:0 0 2px 0'><h2 style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:4.5pt;margin-left:0in;line-height:14.25pt'><span style='font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#26282A'>stanimir.varbanov/v4l2-decode.git - Unnamed repository<o:p></o:p></span></h2></td></tr></table></td></tr></table></td></tr></table></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'>I basically changed the Varbanov's code to catch the camera frames and feed the encoder, my code works in the sense I can record an h264 video (not mp4 as gstreamer does), but I noticed the results I commented in my previous mail.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'>So what additional processing gstreamer applies to the video hardware encoding ?<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'>Regards,<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'>Simon<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'><o:p> </o:p></span></p></div><div id="yahoo_quoted_4802334363"><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>Il mercoledì 25 aprile 2018, 22:49:38 CEST, Rand Graham <</span><a href="mailto:rand.graham@zenith.com"><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif'>rand.graham@zenith.com</span></a><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>> ha scritto: <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'><o:p> </o:p></span></p></div><div><div id=yiv7041149014><div><div><p class=yiv7041149014msonormal><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>Hello,</span><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'><o:p></o:p></span></p><p class=yiv7041149014msonormal><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif;color:#26282A'> </span><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'><o:p></o:p></span></p><p class=yiv7041149014msonormal><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>It might help if you mention which embedded board you are using.</span><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'><o:p></o:p></span></p><p class=yiv7041149014msonormal><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif;color:#26282A'> </span><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'><o:p></o:p></span></p><p class=yiv7041149014msonormal><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>In order to use custom hardware from a vendor such as nVidia, you would compile gstreamer plugins provided by the vendor and then specify them in your pipeline.</span><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'><o:p></o:p></span></p><p class=yiv7041149014msonormal><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif;color:#26282A'> </span><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'><o:p></o:p></span></p><p class=yiv7041149014msonormal><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>Regards,</span><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'><o:p></o:p></span></p><p class=yiv7041149014msonormal><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>Rand</span><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'><o:p></o:p></span></p><p class=yiv7041149014msonormal><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif;color:#26282A'> </span><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'><o:p></o:p></span></p><div id=yiv7041149014yqt02964><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=yiv7041149014msonormal><b><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>From:</span></b><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif;color:#26282A'> gstreamer-devel [</span><a href="mailto:gstreamer-devel-bounces@lists.freedesktop.org"><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif'>mailto:gstreamer-devel-bounces@lists.freedesktop.org</span></a><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>] <b>On Behalf Of </b></span><a href="mailto:simon.zz@yahoo.com"><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif'>simon.zz@yahoo.com</span></a><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif;color:#26282A'><br><b>Sent:</b> Wednesday, April 25, 2018 1:01 PM<br><b>To:</b> </span><a href="mailto:gstreamer-devel@lists.freedesktop.org"><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif'>gstreamer-devel@lists.freedesktop.org</span></a><span style='font-size:11.0pt;font-family:"Helvetica",sans-serif;color:#26282A'><br><b>Subject:</b> How do gstreamer interfaces with H264 hardware encoders and creates videos ?</span><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'><o:p></o:p></span></p></div></div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'> <o:p></o:p></span></p><div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>Hello,<o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'> <o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>I am using an embedded board which has an hardware H264 encoder and I am testing video generation both with gst-launch and with a C++ code wrote by my self.<o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'> <o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>Comparing my code results to the gst-launch results, it is clear and obvious that gstreamer applies additional processing compared to what I get from the hardware encoder buffer.<o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>The first obvious processing is that it generates an mp4 video, while I can only generate an h264 video, but I am not using additional mp4 demux in my code.<o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'> <o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>For example, the gst-launch resulting video image's quality it's quiet better, the video has the correct framerate rather than the video I obtain which results slightly "accelerated", and in addtition, the time-stap (minutes - seconds) is present while in the video I obtain from my C++ code it's not.<o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'> <o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>So I suspect that gstreamer doesn't use the hardware encoder.<o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>How can I be sure that gstreamer uses the hardware encoder instead of a h264 software library and how can I know in real time what are the V4L2 settings that gstreamer applies to the encoder ?<o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'> <o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>Thanks.<o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>Regards,<o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'>Simon<o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'> <o:p></o:p></span></p></div><div><p class=yiv7041149014msonormal><span style='font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282A'> <o:p></o:p></span></p></div></div></div></div></div></div></div></div></div></div></div></body></html>