<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body text="#000000" bgcolor="#FFFFFF"> <div class="moz-cite-prefix">On 8/7/2019 9:40 AM, Nicolas Dufresne-5 [via GStreamer-devel] wrote: </div> <blockquote type="cite" cite="mid:c2abb7b7ae99a401c43ec7744487422567a0aa6d.camel@ndufresne.ca"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> Le mardi 06 août 2019 à 14:31 +0800, Yan Wang a écrit : <div class="shrinkable-quote"> > > On 8/5/2019 9:29 PM, Nicolas Dufresne-5 [via GStreamer-devel] wrote: > > > > Le lun. 5 août 2019 02 h 55, Yan Wang <[hidden email]> a écrit : > > > > > > On 8/3/2019 9:25 PM, Nicolas Dufresne-5 [via GStreamer-devel] wrote: > > > > Le vendredi 02 août 2019 à 20:45 -0500, kmliu a écrit : > > > > > > > > > I need to decode H.264 video via VAAPI and then extract the decoded frames to > > > > > main memory. Since I intend to crop the frames anyway, I'd like to crop them > > > > > while they're still in graphics memory, to reduce memory bandwidth > > > > > consumption. So conceptually, I want to do this: > > > > > > > > > > gst-launch-1.0 rtspsrc location=rtsp_uri ! rtph264depay ! vaapih264dec ! > > > > > videocrop left=x right=x top=x bottom=x ! filesink location=video.yuv > > > > > > > > > > But I think this will end up copying the whole frames to main memory before > > > > > cropping it there. It would be nice if vaapipostproc supports cropping? > > > > > > > > Another (simplier) option is to use gltransformation, but apparently > > > > not all distro ship this plugin. > > > > > > May I add the crop option for vaapih264dec? > > > > > > It may be more direct. > > > > > > > > > > Sounds wrong to me, and I doubt you'll find an API to support that. If there is one element in VAAPI that may have an API for this it would be vaapipostproc. > > Yes. I know vaapipostproc can do this. > > IMHO, this could be done in decode context too if VAConfigAttribDecProcessing can support it. > > <a href="https://github.com/intel/libva/blob/master/va/va.h#L520" target="_top" rel="nofollow" link="external" moz-do-not-send="true">https://github.com/intel/libva/blob/master/va/va.h#L520</a> > > Currently It can do scaling (1/8 ~ 8x at most, CSC). Cropping can be the special case of scaling. > > If vaapih264dec provides the interface, it can reduce the overhead and power because it is fixed function. And no need vaapipostproc context. > > But it may make vaapih264dec more complex and cannot support multiply pipelines of decoding. So it is just one possible option. </div> If you know how it works, just give it a try. You can find similar code in -good/sys/gstv4l2videodec.c, but only for the CSC bit. Scaling is more complex though, because of the pixel aspect ratio handling. It's this a proper scaler or just multiple of 2 ? </blockquote> I will check -good/sys/gstv4l2videodec.c. This scaling/CSC has some limitation. It could be attached only one decoding pipeline. So it is different with normal videopostproc pipeline but videopostproc pipeline could select it too. The logic of the selection should be in media driver currently. Of course, it can also be selected in gstreamer-vaapi directly. Thanks for your comments. Yan Wang <blockquote type="cite" cite="mid:c2abb7b7ae99a401c43ec7744487422567a0aa6d.camel@ndufresne.ca"> <div class="shrinkable-quote"> > > Thanks. > > Yan Wang > > > > > > Thanks. > > > > > > Yan Wang > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > Sent from: <a href="http://gstreamer-devel.966125.n4.nabble.com/" target="_top" rel="nofollow" link="external" moz-do-not-send="true">http://gstreamer-devel.966125.n4.nabble.com/</a> > > > > > _______________________________________________ > > > > > gstreamer-devel mailing list > > > > > [hidden email] > > > > > <a href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_top" rel="nofollow" link="external" moz-do-not-send="true">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> > > > > > > > > _______________________________________________ > > > > gstreamer-devel mailing list > > > > [hidden email] > > > > <a href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_top" rel="nofollow" link="external" moz-do-not-send="true">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> > > > > > > > > If you reply to this email, your message will be added to the discussion below: > > > > <a href="http://gstreamer-devel.966125.n4.nabble.com/Is-there-a-way-to-crop-in-VAAPI-tp4691566p4691569.html" target="_top" rel="nofollow" link="external" moz-do-not-send="true">http://gstreamer-devel.966125.n4.nabble.com/Is-there-a-way-to-crop-in-VAAPI-tp4691566p4691569.html</a> > > > > To start a new topic under GStreamer-devel, email [hidden email] > > > > To unsubscribe from GStreamer-devel, click here. > > > > NAML > > > > > > _______________________________________________ > > > gstreamer-devel mailing list > > > [hidden email] > > > <a href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_top" rel="nofollow" link="external" moz-do-not-send="true">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> > > > > _______________________________________________ > > gstreamer-devel mailing list > > [hidden email] > > <a href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_top" rel="nofollow" link="external" moz-do-not-send="true">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> > > > > If you reply to this email, your message will be added to the discussion below: > > <a href="http://gstreamer-devel.966125.n4.nabble.com/Is-there-a-way-to-crop-in-VAAPI-tp4691566p4691583.html" target="_top" rel="nofollow" link="external" moz-do-not-send="true">http://gstreamer-devel.966125.n4.nabble.com/Is-there-a-way-to-crop-in-VAAPI-tp4691566p4691583.html</a> > > To start a new topic under GStreamer-devel, email <a href="/user/SendEmail.jtp?type=node&node=4691613&i=0" target="_top" rel="nofollow" link="external" moz-do-not-send="true">[hidden email]</a> > > To unsubscribe from GStreamer-devel, click here. > > NAML > > _______________________________________________ > gstreamer-devel mailing list > <a href="/user/SendEmail.jtp?type=node&node=4691613&i=1" target="_top" rel="nofollow" link="external" moz-do-not-send="true">[hidden email]</a> > <a href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_top" rel="nofollow" link="external" moz-do-not-send="true">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a></div> _______________________________________________ gstreamer-devel mailing list <a href="/user/SendEmail.jtp?type=node&node=4691613&i=2" target="_top" rel="nofollow" link="external" moz-do-not-send="true">[hidden email]</a> <a href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_top" rel="nofollow" link="external" moz-do-not-send="true">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> <hr size="1" noshade="noshade" color="#cccccc"> <div style="color:#444; font: 12px tahoma,geneva,helvetica,arial,sans-serif;"> <div style="font-weight:bold">If you reply to this email, your message will be added to the discussion below:</div> <a href="http://gstreamer-devel.966125.n4.nabble.com/Is-there-a-way-to-crop-in-VAAPI-tp4691566p4691613.html" moz-do-not-send="true">http://gstreamer-devel.966125.n4.nabble.com/Is-there-a-way-to-crop-in-VAAPI-tp4691566p4691613.html</a> </div> <div style="color:#666; font: 11px tahoma,geneva,helvetica,arial,sans-serif;margin-top:.4em;line-height:1.5em"> To start a new topic under GStreamer-devel, email <a class="moz-txt-link-abbreviated" href="mailto:ml+s966125n966125h86@n4.nabble.com">ml+s966125n966125h86@n4.nabble.com</a> To unsubscribe from GStreamer-devel, <a href="http://gstreamer-devel.966125.n4.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=966125&code=eWFuLndhbmdAbGludXguaW50ZWwuY29tfDk2NjEyNXwxMDk4MzUzMzA=" moz-do-not-send="true">click here</a>. <a href="http://gstreamer-devel.966125.n4.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml" rel="nofollow" style="font:9px serif" moz-do-not-send="true">NAML</a> </div> </blockquote> </body> </html>