Re: usb-ohci, ov511, video4linux

["christophe barbé" <christophe.barbe.ml@online.fr>]

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On Sun, Jan 20, 2002 at 05:22:58PM +0100, Guus Sliepen wrote:
> On Sun, Jan 20, 2002 at 10:41:19AM -0500, christophe barbé wrote:
> 
> > The Xawtv outputs are interesting :
> > 
> > # xawtv
> > This is xawtv-3.68, running on Linux/i586 (2.4.17)
> > /dev/video0 [v4l]: no overlay support
> 
> That's normal.
> 
> > v4l-conf had some trouble, trying to continue anyway
> 
> That too, because of the earlier warning about overlay.
> 
> > v4l: timeout (got SIGALRM), hardware/driver problems?
> > ioctl: VIDIOCSYNC(0): Appel système interrompu
> > v4l: timeout (got SIGALRM), hardware/driver problems?
> > ioctl: VIDIOCSYNC(1): Appel système interrompu
> 
> xawtv has a very short timeout when it tries to grab frames. It really
> was made for TV cards, not webcams. You can either change xawtv's
> libng/grab-v4l.c and edit the line containing #define SYNC_TIMEOUT, or
> use a program like gqcam that is written especially for slow USB
> webcams.
> 
> The problems with the other USB devices might be caused by the fact that
> USB webcams will use all the available bandwidth.

I have the same problem with gqcam, camstream and gnomemeeting.
With xawtv and the debug option, the problem disapears. Perhaps the
timeout is increased in this case. I will check the code.

The problem with the usb mouse is there with or without webcam.

Christophe

> 
> -- 
> Met vriendelijke groet / with kind regards,
>   Guus Sliepen <guus@sliepen.warande.net>



-- 
Christophe Barbé <christophe.barbe@ufies.org>
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cats take a message and get back to you later. --Mary Bly

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