<div dir="auto"><div><br><br><div class="gmail_quote"><div dir="ltr">Le mer. 25 avr. 2018 17:42, Rand Graham <<a href="mailto:rand.graham@zenith.com">rand.graham@zenith.com</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="#0563C1" vlink="#954F72"><div class="m_-3957281453993884486WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Hello,<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">It might help if you mention which embedded board you are using.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">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.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Regards,<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Rand<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></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:<a href="mailto:gstreamer-devel-bounces@lists.freedesktop.org" target="_blank" rel="noreferrer">gstreamer-devel-bounces@lists.freedesktop.org</a>] <b>On Behalf Of </b><a href="mailto:simon.zz@yahoo.com" target="_blank" rel="noreferrer">simon.zz@yahoo.com</a><br><b>Sent:</b> Wednesday, April 25, 2018 1:01 PM<br><b>To:</b> <a href="mailto:gstreamer-devel@lists.freedesktop.org" target="_blank" rel="noreferrer">gstreamer-devel@lists.freedesktop.org</a><br><b>Subject:</b> How do gstreamer interfaces with H264 hardware encoders and creates videos ?<u></u><u></u></span></p></div></div><p class="MsoNormal"><u></u> <u></u></p><div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">Hello,<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif"><u></u> <u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">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.<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif"><u></u> <u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">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.<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">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.<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif"><u></u> <u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">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.<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif"><u></u> <u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">So I suspect that gstreamer doesn't use the hardware encoder.<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">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 ?</span></p></div></div></div></div></blockquote></div></div><div dir="auto"><br></div><div dir="auto">As you mention v4l2 settings, I suppose you have a hardware with v4l2 M2M codecs or are you referring to your camera setting ?</div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="#0563C1" vlink="#954F72"><div class="m_-3957281453993884486WordSection1"><div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif"><u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif"><u></u> <u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">Thanks.<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">Regards,<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">Simon<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif"><u></u> <u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif"> <u></u><u></u></span></p></div></div></div></div>_______________________________________________<br>
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