Re: [Ekiga-list] BUG: Cropped video with Logitec camera

[Damien Douxchamps <ddouxcha is naist jp>]

Hello Julien,

On Tue, 2007-07-31 at 13:31 +0200, Julien Puydt wrote:
> Damien Douxchamps a écrit :
> > Hi all,
> > 
> > First post, so I have to start by thanking the developers for Ekiga!
> > 
> > Then my little bug...
> > 
> > I'm trying to use Ekiga with a Logitec camera but I can only see a
> > centered crop of the full image. effectv works and display 320x240.
> > Xawtv works too, but returns an error before displaying the video:
> > 
> > ioctl: VIDIOCMCAPTURE(frame=0;height=144;width=176;format=7): Invalid argument
> > 
> > So my guess is that my camera does not support 144x176. The FAQ says
> > that in that case Ekiga falls back to a higher resolution and scales
> > down, but what I observe is a crop.
> > 
> > More information about my system:
> 
> This should be in the FAQ : Ekiga falls back to a higher resolution and 
> scales down... but only if the driver returns an error code!
> 
> If the driver doesn't support the resolution, but still returns it's ok, 
> then crops... then ekiga has no way to know something wrong happens!

That's clearer than the current FAQ, thanks ;)

> So the bug is in the driver, which by not being honest, prevents ekiga 
> from properly handling the situation.

Could it also be the camera that accepts 144x176 by cropping internally
without the driver knowing about it? In that case it would be nice to be
able to force Ekiga to use a scaled down 320x240.

-- 
  _    Damien 高原 Douxchamps
 ('-   Assistant Professor
 //\   Image Processing Laboratory, NAIST
 V_/_  http://damien.douxchamps.net/