[gst-devel] High CPU usage in ffmpegcolorspace

[Julien Isorce]

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.

2008/6/16 Wim Taymans <wim.taymans at gmail.com>:

> 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)
> >
>
> 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 ! fakesink sync=1
>
> 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
>
> > Thx.
> >
> > 2008/6/16 Tim Müller <t.i.m at zen.co.uk>:
> >         > > 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] http://bugzilla.gnome.org/show_bug.cgi?id=500152
> >
> >
> >
> >
> >
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