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Date: Sun, 21 Dec 2014 19:58:32 -0800
From: Daniel Frey <djqfrey@gmail.com>
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Subject: Re: [gentoo-user] webcam on Gentoo Logitech C270
References: <20141221165128.GA4092@syscon7> <20141221170040.GB4092@syscon7> <20141221183211.7aabb7d4@hal9000.localdomain> <20141221175643.GB14158@solfire> <20141221182218.GA4071@syscon7> <20141221184910.GA3912@syscon7> <CAJ1xhMVy-dRLYQ4fd360ZvZqpxG=-V3_7oSukb17Fzu0CFq3-A@mail.gmail.com> <20141222024901.GB4154@syscon7>
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On 12/21/2014 06:49 PM, Joseph wrote:
> When I try to run: guvcview
> 
> video device: /dev/video0 ERROR opening V4L2 interface for /dev/video0
> unable to detect video devices on your system (0)
> ERROR opening V4L interface: Permission denied

It can't open the device. You probably aren't in the right group for access.

I suspect it'd be the video group, just do:

ls -lhd /dev/video0

...and see what the permissions are, it's probably going to be root:video.

For my mythtv card, I know for sure it's root:video.

If that's all it is, use gpasswd and add yourself to the group then log
out and in again.

Dan