[PD] Gem - CPU usage 98%

[Andrew Cavers]

Klaas,

I suspect that it will be the motion detection part of your patch that
will be eating the CPU most. If the video input is only being used to
detect motion and the live video is not being displayed then setting
the camera to it's lowest resolution will be more than adequate and
will drastically reduce the load on the CPU. Also decrease the number
of frames per second being analysed for movement. The speed of the GPU
will certainly not help you in this instance.

My "mution" project used motion detection with PD/PDP/PiDiP from
160x120 resolution webcam input at 15fps which gave very reliable
results and produced a load of only 20-30% on a 600mhz machine
(running Linux).

Of course, the codec of the file you are playing will also hit the CPU
(again, not the GPU) but I am not the best person to advise about
that.

Good luck,

Andrew.

On 6/8/06, klaas de Baas <kdebaas at hotmail.com> wrote:
> Hello,
>
> I am working on a patch, in which I use a webcam as a motiondetector, to
> drive another video (AVI, DV). (Every detected motion forwards a frame of
> the movie playing in pix_movie). I want this patch to be playing fullscreen
> in an exhibition for two months, non-stop. The problem is that I am worried
> about the CPU load - it hovers above 90% in Task Manager. (OS=WinXP) My
> concern is that the computer will not hold out on that load for that long.
>
> I had hoped to solve this by buying a new graphics card, which I thought
> would have taken over the processing load. I have been experimenting with
> the Asus n6200 256 MB (a Nvidia Geforce 6200 card) and the Hercules ati
> Radeon 9000 128 MB. I'm aware that my Mobo does not support 8X AGP bus
> speed, but since I am mainly looking for 2d acceleration I hoped it would be
> ok.
>
> CPU utilization is still high. My questions:
> - was I wrong in supposing that the GPU would take over processing tasks of
> the CPU?
> - what would be a realistic cpu load for 24 hours a day, 2 months?
> - Does anyone on the list have experience with running fullscreen
> gem-patches with specs such as pentium III, 800Mhz, 384 Mb, and do they have
> any pointers on how to optimize (such as using a different size video,
> codec, etc..?)
>
> I am also working on another computer (faster pIV, 512MB etc, etc...). I
> noticed that playing a video in mediaplayer requires less than half the cpu
> load of playing it in pix-movie or pix-film.
> - Can anyone explain why this is?
>
> Looking forward to hear from you.
>
> Klaas
>
>
> windows XP, pIII 800Mhz, 384 MB, Abit VL 6 Mobo, Hercules ATI Radeon 9000
> 128Mb
>
>
>
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-- 
--
Andrew Cavers
andy at mution.com
www.mution.com