Discussion:
[gentoo-user] guvcview - no video device (/dev/video0) found
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t***@sys-concept.com
2023-05-13 21:00:01 UTC
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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.
--
Thelma
Andreas Fink
2023-05-14 04:40:01 UTC
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On Sat, 13 May 2023 14:50:33 -0600
Post by t***@sys-concept.com
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
[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*
t***@sys-concept.com
2023-05-15 19:40:01 UTC
Permalink
Post by Andreas Fink
On Sat, 13 May 2023 14:50:33 -0600
Post by t***@sys-concept.com
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
[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.
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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