hi luis
thank you very much for that hint. i would never have found that out on
my own ;-)
i am not sure, if it is possible at all, but i wonder if there's a way
to switch off all that automated stuff like whitebalance, shutter speed
and automatic gain and set it to fixed values. whitebalance was easy
from the beginning, but i still found no options for the other two
parameters. i am using this cam for an artistic project, where the cam
has a fixed position and frames from different times are compared. this
comparison only gives meaningful results, when no automation is involved
in the picture. by googling around, i found that this cam (spc900nc) is
often used by astronomers and i assumed that for them using the camera
in a scientific context, similar criteria are important (but i don't
know, if they also use gnu/linux, of course)
i just want to add, that i have acces to a windows box, where the
original proprietary driver of this cam is installed. just in case that
would be helpful for the further developing of the pwc-driver, i would
be glad to help. i am not a c-coder, though, my help would be limited to
provide some information about how the cam works on windows. if i am
talking bullshit here (cause i actually don't know, how such driver for
hardware with no open specs is developed), forget the last sentence.
best
roman
On Tue, 2006-11-21 at 21:23 +0100, Luis Delgado de Mendoza Garcia wrote:
> in fact is possible to apply some hidden options in the pwc driver.
>
> Because some errors in xawtv, this driver has some hidden features.
>
> If you open pwc-v4l.c in the source code of the driver, you will see a
> line like this:
>
> #if XAWTV_HAS_BEEN_FIXED
>
> so, if you put afther de #include "pwc-ioctl.h" a line like this:
>
> #define XAWTV_HAS_BEEN_FIXED 1
>
> you will get the full bunch of options in the pwc driver.
>
> Hope it helps. bye
>
>
> On 11/21/06, Roman Haefeli <> wrote:
> hi steve
>
> i am quite a noob on this topic, though, but i also looked for
> a
> Quickcam 4000 pro, because i tested it once, but same story
> here: they
> seem to be not available anymore
>
> i spent a whole afternoon on searching a cam, that is:
> a) supported by a driver on linux
> b) is available in my country (switzerland) at the moment
>
> the only one i could find was a philips spc 900nc, for which
> recently
> support was added in the pwc-driver.
>
> the cam works, but the pwc driver doesn't support many of the
> options
> that are available on windows
>
> what is possible under linux with a spc900nc:
>
> 640x480 @ 15fps
> 320x240 @ 30fps
> 160x120 @ 30fps
>
> philips advertizes it as a cam with a max. framerate of 90fps,
> but even
> under windows i couldn't set the cam to more than 30, altough
> the option
> is listed.
>
> under windows you can switch off automatic whitebalanca and
> automatic
> shutter, which is not possible with the pwc driver.
>
> btw: is there any cam supported by the pwc driver, where you
> can switch
> off auto-whitebal and auto-shutter?
>
> roman
>
>
>
> On Tue, 2006-11-21 at 10:25 -0500, Steve Jensen wrote:
> > So after getting PWC (thanks!) working, etc. and a nice
> setup for
> > streaming our zoo and basketball games, the camera I was
> using for
> > testing/development is no longer available :( (Logitech
> Quickcam 4000 pro).
> >
> > So... we're looking for another camera that is currently
> available.
> >
> > Anyone have working experience with the Logitech Orbit? It
> is supported
> > by pwc, so I'm not too worried there, but I'd like to hear a
> success
> > story or two, maybe see a few frames that it captures (from
> a Linux
> > box), etc.
> >
> > Thanks!
> >
> > Steve
> >
> >
>
>
>
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