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Date: Sun, 20 Jan 2002 17:22:58 +0100
From: Guus Sliepen <guus@warande3094.warande.uu.nl>
To: lkml <linux-kernel@vger.kernel.org>
Cc: christophe =?iso-8859-1?Q?barb=E9?= <christophe.barbe@ufies.org>
Subject: Re: usb-ohci, ov511, video4linux
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On Sun, Jan 20, 2002 at 10:41:19AM -0500, christophe barb=E9 wrote:

> The Xawtv outputs are interesting :
>=20
> # 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 syst=E8me interrompu
> v4l: timeout (got SIGALRM), hardware/driver problems?
> ioctl: VIDIOCSYNC(1): Appel syst=E8me 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.

--=20
Met vriendelijke groet / with kind regards,
  Guus Sliepen <guus@sliepen.warande.net>

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