From owner-freebsd-multimedia@FreeBSD.ORG  Tue Mar  6 17:54:43 2012
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Date: Tue, 6 Mar 2012 20:29:54 +0300
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From: Andrey Fesenko <f0andrey@gmail.com>
To: Xavier xfm <xavierfreebsdmultimedia@gmail.com>
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Cc: freebsd-multimedia@freebsd.org
Subject: Re: PWCVIEW(1) say errors
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On Tue, Mar 6, 2012 at 7:48 PM, Xavier xfm
<xavierfreebsdmultimedia@gmail.com> wrote:
> Hi,
>
> Why PWCVIEW(1) don't work ?:
>
>> su
> Password:
> casa# pwcview -d /dev/video8
> Webcam set to: 320x240 (sif) at 5 fps
> libv4l2: error queuing buf 0: Invalid argument
> libv4l2: error queuing buf 1: Invalid argument
> libv4l2: error queuing buf 2: Invalid argument
> libv4l2: error queuing buf 3: Invalid argument
> libv4l2: error reading: Device busy
> Error reading from webcam: Device busy
> casa#
>
> Any idea ?
>
> Thanks.

which of the pwcview you use multimedia/pwcview or multimedia/pwcbsd?
and see log webcamd