[cpia] Re: how to maintain framerate?

[Peter Pregler]

On Tue, Sep 18, 2001 at 07:58:52AM +0100, lau tau tin wrote:
> 
> i try to modify the setting of sensor FPS to 30fps :
> 
> cam->params.sensorFps.divisor=0;
> cam->params.sensorFps.baserate=1;

Use the /proc interface to do so. There is a gui-tool named
cpia-control to modify all camera parameters at run-time.

> but the framerate only get 25frames/second (nothing moving) and drop
> immediately to 9-10 frames/second with a lot motion.
> 
> anyone know how to maintance the framerate and which part of driver
> cpia must to be modify?? help!

The camera, i.e. the USB-bus, cannot sustain 30fps at CIF with much
motion. For instance right now I have with a very dark scene about
900kB/sec and about 5fps, and not CPU load. The 900kB/sec is IHMO
pretty good. The achivable frame-rate depends on the compression
settings and related to this also on the exposure (much noise due to
too dark scene -> frame rate goes down). Play around a bit with the
cpia-control tool to see how the change of the paramters affects the
frame-rate.

Geetings, Peter

-- 
Feeling amorous, she looked under the sheets and cried, "Oh, no,
it's Microsoft!"
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Email: Peter_Pregler@email.com