Ok thx for the tests.I have the exact same behaviour with the dshowvideosrc, so the "slowness" comes from  ( 100% sure :P) the ffmpegcolorspace. Itseems to be good only for size <= 320*240 (5% CPU at 150 FPS), so for now I will just do the conversion myself for my very precise needs. J. <div class="gmail_quote">2008/6/16 Wim Taymans <<a href="mailto:wim.taymans@gmail.com">wim.taymans@gmail.com</a>>: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div class="Ih2E3d">On Mon, 2008-06-16 at 18:16 +0200, Julien Isorce wrote: > Could someone try to replace the videotestsrc by v4l2src ? with the > exact same pipeline. > > (on win32, with the dshwovideosrc there is the same behaviour) > </div>gst-launch-0.10 v4l2src ! "video/x-raw-yuv, format=(fourcc)YUY2, width=640, height=480, framerate=(fraction)30/1" ! ffmpegcolorspace ! <div class="Ih2E3d">video/x-raw-rgb, bpp=32, depth=24 ! fakesink sync=1 </div>Gives me around 17-18% CPU usage with top. I had to reduce the frame size but increase the framerate to match the capabilities of my camera. Removing ffmpegcolorspace from that pipeline brings down the CPU usage to around 1% again. gst-launch-0.10 v4l2src ! "video/x-raw-yuv, format=(fourcc)YUY2, width=640, height=480, framerate=(fraction)30/1" ! xvimagesink Is around 2-3%. gst-launch-0.10 v4l2src ! "video/x-raw-yuv, format=(fourcc)YUY2, width=640, height=480, framerate=(fraction)30/1" ! ffmpegcolorspace ! video/x-raw-rgb, bpp=32, depth=24 ! ximagesink Is around 16% with top. Wim <div><div></div><div class="Wj3C7c"> > Thx. > > 2008/6/16 Tim Müller <<a href="mailto:t.i.m@zen.co.uk">t.i.m@zen.co.uk</a>>: >         > > Is it normal that this pipeline : >         > > gst-launch-0.10 videotestsrc ! "video/x-raw-yuv, >         format=(fourcc)YUY2, >         > > width=720, height=576, framerate=(fraction)25/1" ! >         ffmpegcolorspace ! >         > > video/x-raw-rgb, bpp=32, depth=24 ! fakesink sync=1 >         > > uses 50% of the CPU on a Pentium4 2.80GHz, 2 Go RAM ? >         > > >         > > Please someone can confirm that and say us your CPU ? >         > >         > 24% according to top on an Intel(R) Core(TM)2 Duo CPU T7100 >         @ 1.80GHz. >         > Which would equate to filling up half a Core. Yes, >         ffmpegcolorspace is >         > slow, patches welcome. > > >         FWIW, videotestsrc seems to be responsible for about half the >         cpu cycles >         burnt in this case (also see [1]). > >          Cheers >          -Tim > >         [1] <a href="http://bugzilla.gnome.org/show_bug.cgi?id=500152" target="_blank">http://bugzilla.gnome.org/show_bug.cgi?id=500152</a> > > > > >         ------------------------------------------------------------------------- >         Check out the new SourceForge.net Marketplace. >         It's the best place to buy or sell services for >         just about anything Open Source. >         <a href="http://sourceforge.net/services/buy/index.php" target="_blank">http://sourceforge.net/services/buy/index.php</a> >         _______________________________________________ >         gstreamer-devel mailing list >         <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> >         <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> > > > ------------------------------------------------------------------------- > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > <a href="http://sourceforge.net/services/buy/index.php" target="_blank">http://sourceforge.net/services/buy/index.php</a> > _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </div></div></blockquote></div>