Re: [Linux-uvc-devel] again "Logitech QuickCam Pro for Notebooks 046d:0991"

[Alexey Fisher <bug-track@fisher-privat.net>]

Hi Laurent,

Am Mittwoch, den 28.10.2009, 13:52 +0100 schrieb Laurent Pinchart:
> Hi Alexey,
> 
> On Wednesday 28 October 2009 10:58:24 Alexey Fisher wrote:
> > Am Mittwoch, den 28.10.2009, 00:27 +0100 schrieb Laurent Pinchart:
> > > On Monday 26 October 2009 15:06:41 Hans de Goede wrote:
> > > > On 10/26/2009 12:52 PM, Alexey Fisher wrote:
> > > > > Am Sonntag, den 25.10.2009, 14:21 +0100 schrieb Hans de Goede:
> > >
> > > [snip]
> > >
> > > > > > fwiw I'm a v4l kernel developer, but I'm not involved in the UVC
> > > > > > driver, I'm however a contributor to cheese, I thought that my
> > > > > > input that cheese would give up even if the driver has a long
> > > > > > enough timeout would be helpful.
> > > > > >
> > > > > > To try and see if this (the cheese timeout is the issue), you will
> > > > > > need to re-compile cheese from source, after unpacking cheese, edit
> > > > > > src/cheese-webcam.c and goto line 716 (in 2.28.0)
> > > > > >
> > > > > > And change the "10 * GST_SECOND" there in something bigger. I also
> > > > > > see that I'm mistaken and the timeout in cheese is not 3 but 10
> > > > > > seconds, it might have changed recently, or my memory has been
> > > > > > playing tricks on me.
> > > > > >
> > > > > > I still believe this might be the cause, the trace you have posted
> > > > > > seems consistent with cheese's behaviour. Also noticed that there
> > > > > > never is a successfull DQBUF the first time cheese opens the
> > > > > > device. If cheese (or rather gstreamer) does not manage to DQBUF
> > > > > > the first time, then cheese will not work with the device. There is
> > > > > > a limitation in gstreamer (or maybe in the way cheese uses it)
> > > > > > where gstreamer needs to be streaming before cheese can tell the
> > > > > > properties of the cam. If the stream does not start within the
> > > > > > first 10 seconds, then cheese will fail to get the properties.
> > > > > >
> > > > > > If you go to cheese's edit ->  preferences menu, and your cam has
> > > > > > no resolutions listed there (the resolution drop down is grayed
> > > > > > out). This is what is happening.
> > > > > >
> > > > > > As for empathy, I'm not familiar with that. But if we can get
> > > > > > cheese to work first I'm sure that that would be a good step in the
> > > > > > right direction.
> > > > >
> > > > > Hallo Hans,
> > > > > thank you for your constructive response,
> > > > > I increased timeout to 15 seconds i now i can't reproduce camera
> > > > > freeze, i'll play with it more to be sure. There is still one issue
> > > > > with it - on cold start the image is zoomed in.
> > > > > I need to close cheese and open it again to get normal zoom. The
> > > > > resolution seems to be the same.
> > >
> > > Zoomed in ? Really ? As far as I know the QuickCam Pro for Notebooks has
> > > no optical or digital zoom. Could you please send me lsusb's output for
> > > your device ?
> > 
> > Yes. I can use digital zoom under M$Win with Logitech software.
> 
> That's probably implemented in software in the Windows driver.
> 
> [snip]
> The zoom control, if present, should have appeared here.
> 
> As your camera doesn't expose any zoom control I really don't know where the 
> zoom comes from.
> 

i don't really care about zoom problem. This not making this webcam
freeze so probably nobody will find this issue. You can sleep well :) 

if you have some ideas about camera freeze, please let me know.

regards,

Alexey.