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<div>Hello Rand,<br><div><br><div>Yes I recompiled the libs as 96boards suggests.<br><div>The pipeline I use is:<br><div><br><div><b><span>gst-launch-1.0 -v -e v4l2src device=/dev/video3 ! videoconvert! video/x-raw,width=1920,height=1080 ! v4l2h264enc extra-controls="controls,h264_profile=4,video_bitrate=2000000;" ! h264parse ! mp4mux ! filesink location=video.mp4<br></span></b><b><span></span></b><div><br><div><div>and this pipeline creates a quiet good video..<br><div>In this case the output is:<br><div><br><div><b><span>Setting pipeline to PAUSED ...<br>Pipeline is live and does not need PREROLL ...<br>Setting pipeline to PLAYING ...<br>New clock: GstSystemClock<br>/GstPipeline:pipeline0/GstV4l2Src:v4l2src0.GstPad:src: caps = video/x-raw, width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, pixel-aspect-ratio=(fraction)1/1<br>/GstPipeline:pipeline0/GstVideoConvert:videoconvert0.GstPad:src: caps = video/x-raw, width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, pixel-aspect-ratio=(fraction)1/1<br>/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = video/x-raw, width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, pixel-aspect-ratio=(fraction)1/1<br>/GstPipeline:pipeline0/GstTee:t.GstTeePad:src_0: caps = video/x-raw, width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, pixel-aspect-ratio=(fraction)1/1<br>/GstPipeline:pipeline0/GstQueue:queue0.GstPad:src: caps = video/x-raw, width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, pixel-aspect-ratio=(fraction)1/1<br>/GstPipeline:pipeline0/v4l2h264enc:v4l2h264enc0.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, profile=(string)high, level=(string)1, width=(int)1920, height=(int)1080, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1<br>/GstPipeline:pipeline0/GstH264Parse:h264parse0.GstPad:sink: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, profile=(string)high, level=(string)1, width=(int)1920, height=(int)1080, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1<br>/GstPipeline:pipeline0/GstQueue:queue0.GstPad:sink: caps = video/x-raw, width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, pixel-aspect-ratio=(fraction)1/1<br>/GstPipeline:pipeline0/GstTee:t.GstTeePad:src_1: caps = video/x-raw, width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, pixel-aspect-ratio=(fraction)1/1<br>Redistribute latency...<br>/GstPipeline:pipeline0/GstQueue:queue1.GstPad:src: caps = video/x-raw, width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, pixel-aspect-ratio=(fraction)1/1<br>/GstPipeline:pipeline0/GstQueue:queue1.GstPad:sink: caps = video/x-raw, width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, pixel-aspect-ratio=(fraction)1/1<br>/GstPipeline:pipeline0/GstTee:t.GstPad:sink: caps = video/x-raw, width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, pixel-aspect-ratio=(fraction)1/1<br>/GstPipeline:pipeline0/GstTee:t.GstPad:sink: caps = video/x-raw, width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, pixel-aspect-ratio=(fraction)1/1<br>/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps = video/x-raw, width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, pixel-aspect-ratio=(fraction)1/1<br>/GstPipeline:pipeline0/GstVideoConvert:videoconvert0.GstPad:sink: caps = video/x-raw, width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, pixel-aspect-ratio=(fraction)1/1<br>/GstPipeline:pipeline0/v4l2h264enc:v4l2h264enc0.GstPad:sink: caps = video/x-raw, width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, pixel-aspect-ratio=(fraction)1/1<br>/GstPipeline:pipeline0/GstH264Parse:h264parse0.GstPad:src: caps = video/x-h264, stream-format=(string)avc, alignment=(string)au, profile=(string)high, level=(string)1, width=(int)1920, height=(int)1080, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, parsed=(boolean)true, codec_data=(buffer)0164000affe100176764000aacd201e0089a100fe502b3b9aca008da1426a001000568ce06e2c0<br>/GstPipeline:pipeline0/GstMP4Mux:mp4mux0.GstPad:video_0: caps = video/x-h264, stream-format=(string)avc, alignment=(string)au, profile=(string)high, level=(string)1, width=(int)1920, height=(int)1080, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:7:1, parsed=(boolean)true, codec_data=(buffer)0164000affe100176764000aacd201e0089a100fe502b3b9aca008da1426a001000568ce06e2c0<br>/GstPipeline:pipeline0/GstMP4Mux:mp4mux0.GstPad:src: caps = video/quicktime, variant=(string)iso<br>/GstPipeline:pipeline0/GstFileSink:filesink0.GstPad:sink: caps = video/quicktime, variant=(string)iso</span></b><br><br></div></div></div></div><div>Otherwise, If I use the following pipeline to extract raw frames while I am recording the video<br><div><div><b><br></b><div><b><span>sudo gst-launch-1.0 -e v4l2src device=/dev/video3 ! videoconvert! video/x-raw,width=1920,height=1080 ! tee name=t ! queue ! v4l2h264enc extra-controls="controls,h264_profile=4,video_bitrate=2000000;" ! h264parse ! mp4mux ! filesink location=video.mp4 t. ! queue ! multifilesink location=file%1d.raw<br></span></b><b><span></span></b><div><br><div><div>the resulting video is quiet crappy, not all frames are being recorded and the sequence remains locked on a single frame for a few seconds. It's obvious that the extracting frames task is not good while recording a video. If gstreamer should be using the h264 encoder, why it gives this problems in this case ?<br>I doubt about it because my C/C++ code doesn't generate a bad video as in this case.</div><div><div><div><br><div><b>>> <span><span style="font-size:11.0pt;">It is then using a parser and a muxer and a filesink to create an mp4 file. </span></span></b><br><br></div></div><div><div>This is an interesting point. In this case gstreamer should use a mp4 library using the h264 encoded data ? <br>This makes sense to me.</div><div><br>Simon<br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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Il mercoledì 25 aprile 2018, 23:49:53 CEST, Rand Graham <rand.graham@zenith.com> ha scritto:
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#yiv9593203778 </style><div><div class="yiv9593203778WordSection1"><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;">Hello,</span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;"> </span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;">Did you recompile according to the release notes? Are you using the pipeline shown in the release notes?</span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;"> </span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;">To know what is being done by gstreamer, you should copy paste the exact pipeline you are using.</span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;"> </span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;">The release notes show this pipeline</span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;"> </span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;">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</span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;"> </span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;">It looks like this pipeline is using v4l2h264enc to do the h.264 encoding.</span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;"> </span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;">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.</span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;"> </span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;">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)</span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;"> </span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;">Regards,</span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;">Rand</span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;"> </span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;"> </span></p><p class="yiv9593203778MsoNormal"><span style="font-size:11.0pt;"> </span></p><div class="yiv9593203778yqt3804419001" id="yiv9593203778yqt01183"><div><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in;"><p class="yiv9593203778MsoNormal"><b><span style="font-size:11.0pt;">From:</span></b><span style="font-size:11.0pt;"> gstreamer-devel [mailto:gstreamer-devel-bounces@lists.freedesktop.org] <b>On Behalf Of </b>simon.zz@yahoo.com<br clear="none"><b>Sent:</b> Wednesday, April 25, 2018 4:33 PM<br clear="none"><b>To:</b> Discussion of the Development of and With GStreamer <gstreamer-devel@lists.freedesktop.org><br clear="none"><b>Subject:</b> Re: RE: How do gstreamer interfaces with H264 hardware encoders and creates videos ?</span></p></div></div><p class="yiv9593203778MsoNormal"> </p><div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;">Hello Rand,</span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;">You are right. The board is a Dragonboard 410c by 96boards.</span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778MsoNormal"><a rel="nofollow" shape="rect" target="_blank" href="https://developer.qualcomm.com/hardware/snapdragon-410/tools"><span style="font-size:10.0pt;">https://developer.qualcomm.com/hardware/snapdragon-410/tools</span></a><span style="font-size:10.0pt;"></span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;">96boards in their release notes</span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778MsoNormal"><a rel="nofollow" shape="rect" target="_blank" href="http://releases.linaro.org/96boards/dragonboard410c/linaro/debian/latest/"><span style="font-size:10.0pt;">http://releases.linaro.org/96boards/dragonboard410c/linaro/debian/latest/</span></a><span style="font-size:10.0pt;"></span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;">write that the gstreamer pipeline uses the video encoder.</span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;">But as I said before, I noticed notable differences in video results, which make me doubt that gstreamer really uses the encoder..</span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;">The C/C++ code I am using is based on this one:</span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778MsoNormal"><a rel="nofollow" shape="rect" target="_blank" href="https://git.linaro.org/people/stanimir.varbanov/v4l2-decode.git/tree"><span style="font-size:10.0pt;">stanimir.varbanov/v4l2-decode.git - Unnamed repository</span></a><span style="font-size:10.0pt;"></span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;"> </span></p></div><div id="yiv9593203778ydp8a39d818enhancr_card_4929569402"><table class="yiv9593203778MsoNormalTable" cellspacing="0" cellpadding="0" border="0"><tbody><tr><td colspan="1" rowspan="1" style="width:300.0pt;padding:0in 0in 0in 0in;" width="400"><table class="yiv9593203778MsoNormalTable" style="width:100.0%;border:solid #E0E4E9 1.0pt;" cellspacing="0" cellpadding="0" width="100%" border="1"><tbody><tr><td colspan="1" rowspan="1" style="border:none;padding:0in 0in 0in 0in;"><table class="yiv9593203778MsoNormalTable" style="width:100.0%;background:white;border:none;border-top:solid #E0E4E9 1.0pt;" cellspacing="0" cellpadding="0" width="100%" border="1"><tbody><tr><td colspan="1" rowspan="1" style="border:none;padding:12.0pt 0in 12.0pt 9.0pt;" valign="top"></td><td colspan="1" rowspan="1" style="width:99.0%;border:none;padding:9.0pt .25in 12.0pt 9.0pt;border-radius:0 0 2px 0;" width="99%"><h2 style="margin-right:0in;margin-bottom:4.5pt;margin-left:0in;line-height:14.25pt;"><span style="font-size:10.5pt;">stanimir.varbanov/v4l2-decode.git - Unnamed repository</span></h2></td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;">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.</span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;">So what additional processing gstreamer applies to the video hardware encoding ?</span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;">Regards,</span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;">Simon</span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;"> </span></p></div><div id="yiv9593203778yahoo_quoted_4802334363"><div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;">Il mercoledì 25 aprile 2018, 22:49:38 CEST, Rand Graham <</span><a rel="nofollow" shape="rect" ymailto="mailto:rand.graham@zenith.com" target="_blank" href="mailto:rand.graham@zenith.com"><span style="font-size:10.0pt;">rand.graham@zenith.com</span></a><span style="font-size:10.0pt;">> ha scritto: </span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778MsoNormal"><span style="font-size:10.0pt;"> </span></p></div><div><div id="yiv9593203778"><div><div><p class="yiv9593203778msonormal"><span style="font-size:11.0pt;">Hello,</span><span style="font-size:10.0pt;"></span></p><p class="yiv9593203778msonormal"><span style="font-size:11.0pt;"> </span><span style="font-size:10.0pt;"></span></p><p class="yiv9593203778msonormal"><span style="font-size:11.0pt;">It might help if you mention which embedded board you are using.</span><span style="font-size:10.0pt;"></span></p><p class="yiv9593203778msonormal"><span style="font-size:11.0pt;"> </span><span style="font-size:10.0pt;"></span></p><p class="yiv9593203778msonormal"><span style="font-size:11.0pt;">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;"></span></p><p class="yiv9593203778msonormal"><span style="font-size:11.0pt;"> </span><span style="font-size:10.0pt;"></span></p><p class="yiv9593203778msonormal"><span style="font-size:11.0pt;">Regards,</span><span style="font-size:10.0pt;"></span></p><p class="yiv9593203778msonormal"><span style="font-size:11.0pt;">Rand</span><span style="font-size:10.0pt;"></span></p><p class="yiv9593203778msonormal"><span style="font-size:11.0pt;"> </span><span style="font-size:10.0pt;"></span></p><div id="yiv9593203778yqt02964"><div><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in;"><p class="yiv9593203778msonormal"><b><span style="font-size:11.0pt;">From:</span></b><span style="font-size:11.0pt;"> gstreamer-devel [</span><a rel="nofollow" shape="rect" ymailto="mailto:gstreamer-devel-bounces@lists.freedesktop.org" target="_blank" href="mailto:gstreamer-devel-bounces@lists.freedesktop.org"><span style="font-size:11.0pt;">mailto:gstreamer-devel-bounces@lists.freedesktop.org</span></a><span style="font-size:11.0pt;">] <b>On Behalf Of </b></span><a rel="nofollow" shape="rect" ymailto="mailto:simon.zz@yahoo.com" target="_blank" href="mailto:simon.zz@yahoo.com"><span style="font-size:11.0pt;">simon.zz@yahoo.com</span></a><span style="font-size:11.0pt;"><br clear="none"><b>Sent:</b> Wednesday, April 25, 2018 1:01 PM<br clear="none"><b>To:</b> </span><a rel="nofollow" shape="rect" ymailto="mailto:gstreamer-devel@lists.freedesktop.org" target="_blank" href="mailto:gstreamer-devel@lists.freedesktop.org"><span style="font-size:11.0pt;">gstreamer-devel@lists.freedesktop.org</span></a><span style="font-size:11.0pt;"><br clear="none"><b>Subject:</b> How do gstreamer interfaces with H264 hardware encoders and creates videos ?</span><span style="font-size:10.0pt;"></span></p></div></div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;"> </span></p><div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;">Hello,</span></p></div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;">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.</span></p></div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;">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.</span></p></div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;">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.</span></p></div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;">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.</span></p></div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;">So I suspect that gstreamer doesn't use the hardware encoder.</span></p></div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;">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><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;">Thanks.</span></p></div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;">Regards,</span></p></div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;">Simon</span></p></div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;"> </span></p></div><div><p class="yiv9593203778msonormal"><span style="font-size:10.0pt;"> </span></p></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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