Output from v4l2-ctl -l:
> User Controls
>
> brightness 0x00980900 (int) : min=0 max=255
step=1 default=128 value=128 flags=slider
> contrast 0x00980901 (int) : min=0 max=255
step=1 default=128 value=128 flags=slider
> gamma 0x00980910 (int) : min=1 max=6 step=1
default=3 value=3 flags=slider
> gain_automatic 0x00980912 (bool) : default=1 value=1
> power_line_frequency 0x00980918 (menu) : min=0 max=2
default=0 value=0
> sharpness 0x0098091b (int) : min=0 max=3 step=1
default=2 value=2 flags=slider
>
> JPEG Compression Controls
>
> compression_quality 0x009d0903 (int) : min=50 max=87
step=1 default=75 value=75
Output from v4l2-ctl -D:
> Driver Info (not using libv4l2):
> Driver name : gspca_zc3xx
> Card type : USB Camera (041e:4051)
> Bus info : usb-0000:00:1d.3-1
> Driver version: 4.15.18
> Capabilities : 0x85200001
> Video Capture
> Read/Write
> Streaming
> Extended Pix Format
> Device Capabilities
> Device Caps : 0x05200001
> Video Capture
> Read/Write
> Streaming
> Extended Pix Format
Maybe "(not using libv4l2):" is my problem? Do I need a webcam app that
specifically supports gspca?
Anyway, I added myself to the 'video' group and ran Cheese.
Since I was already in the terminal, I ran Cheese from the command line
instead of from the GUI, like I usually do, and I was rewarded with some
extra output (editing out some irrelevant lines):
> Xlib: extension "RANDR" missing on display ":0".
> (cheese:8484): cheese-CRITICAL **: 10:26:20.051:
cheese_camera_device_get_name: assertion 'CHEESE_IS_CAMERA_DEVICE (device)'
failed
Cheese still didn't find a video device, and I got the same results running
it as root.
On Thu, Aug 8, 2019 at 4:59 PM John Stoffel <john(a)stoffel.org> wrote:
> >>>>> "Richard" == Richard Klein <rich(a)richardklein.org> writes:
>
> Richard> Hmm...
> Richard> From lsusb:
> Richard> Bus 005 Device 003: ID 041e:4051 Creative Technology, Ltd Live!
> Cam Notebook Pro [VF0250]
>
> So it sees it ok as a USB device
>
> Richard> And from v4l2-ctl:
> Richard> USB Camera (041e:4051) (usb-0000:00:1d.3-1):
> Richard> /dev/video0
>
> And it finds it properly. Maybe you can do:
>
> v4l2-ctl -l /dev/video0
>
> and see what controls is offers. Or try the -D option. See the man
> page for things to try.
>
> Richard> But the webcam app I installed (Cheese) detects no device.
>
> Did you check the permissions of /dev/video? Does 'cheese' have the
> permissions to open the file? Try running as root, or adding your
> account to the 'video' group.
>
> John
>
