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List:       gentoo-user
Subject:    Re: [gentoo-user] [SOLVED] guvcview - no video device (/dev/video0) found
From:       thelma () sys-concept ! com
Date:       2023-05-15 19:33:32
Message-ID: f6763286-4a63-1664-38b8-23263a05196f () sys-concept ! com
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On 5/13/23 22:31, Andreas Fink wrote:
> On Sat, 13 May 2023 14:50:33 -0600
> thelma@sys-concept.com wrote:
> 
> > Getting an error message when trying to start usb-cam:
> > 
> > guvcview
> > ENCODER: no video codec detected for VP9 (VP9)
> > ENCODER: no video codec detected for Theora (ogg theora)
> > GUVCVIEW: version 2.0.8
> > GUVCVIEW: couldn't open /home/joseph/.config/guvcview2/video0 for read: No such \
> >                 file or directory
> > V4L2_CORE: ERROR opening V4L interface: No such file or directory
> > GUVCVIEW (2): Guvcview error
> > 	 no video device (/dev/video0) found
> > GUVCVIEW (Qt5): fatal error (0 devices detected)
> > GUVCVIEW (Qt5): creating error dialog
> > 
> > dmesg:
> > 
> > [935066.984348] usb 1-1.4: Product: Vega USB2.0 Camera
> > [935066.984350] usb 1-1.4: Manufacturer: Vimicro Corp.
> > [936075.049430] usb 1-1.4: USB disconnect, device number 47
> > [936080.312412] usb 1-1.4: new high-speed USB device number 48 using xhci_hcd
> > [936080.504291] usb 1-1.4: New USB device found, idVendor=0ac8, idProduct=0331, \
> > bcdDevice= 1.00 [936080.504296] usb 1-1.4: New USB device strings: Mfr=1, \
> > Product=2, SerialNumber=0 [936080.504297] usb 1-1.4: Product: Vega USB2.0 Camera
> > [936080.504299] usb 1-1.4: Manufacturer: Vimicro Corp.
> > 
> 
> Do you have read/write access to /dev/video0? Try with:
> ls -lh /dev/video*

No, it wasn't the case.
I had to add support for V4L in the kernel.

I'm surprised that there was no emerge note after emerging the package, that package \
needs V4L support in the kernel.  


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