Re: Re: V4L2 Support

Hi Matthias,

> >  Is in your config "Use v4l2" set to yes ?
> 
> "Use v4l2" is set to yes on compilation, so this seems not to be the
> problem.

So, it's ok.

> I'm using a "Logitech Quickcam 5000 Pro" with the linux-uvc driver
> from http://linux-uvc.berlios.de/ which supports v4l2 only.

I have for different cams:
  1. Logitech QuickCam 5000 Pro
  2. Logitech QuickCam for Notebooks Pro (new version)
  3. Logitech QuickCam Fusion
  4. Logitech QuickCam for Notebooks Pro (old version)
Cams 1, 2 and 3 are working with linux-uvc, and cam 4 with pwc
(http://www.saillard.org/linux/pwc/).

All are working with OpenCV. I have just tested camshiftdemo C sample
and the cam-histo.py Python sample. All cams are working with them.
Sometime, with linux-uvc, I have errors like:
  VIDIOC_QUERYCTRL: Input/output error
or
  HIGHGUI ERROR: V4L2: Unable to set palette.
when starting the application, but re-starting the demo corrects the
problem.

> There's a test program named "uvcview" available on
> http://mxhaard.free.fr/spca50x/Investigation/uvc and with this program
> the cam works fine.

Yes. I have used it also when I have patched OpenCV for supporting
linux-uvc.

> When compiling swig, python and quicktime are set to no, the others to
> yes. But I don't think that's the problem...

No. I have swig and Python, but not quicktime.
(I'm using almost only Python with OpenCV, but this is another thing ;-)
)

> Error output is little (telling that /dev/video0 could not be
> initiated or something as I remember, don't rely on me), I can send it
> today afternoon (about 5:00pm GMT) when I'm at home again.

Thanks in advance. Please try to start many times the application to see
if this is a possible work-around.

Hope this help.

        Olivier
-- 
Olivier Bornet, IDIAP, CP 592, CH-1920 Martigny
http://www.idiap.ch/~bornet/
http://www.idiap.ch/~bornet/pgp/
PGP-key: 0xC53D9218


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