Hi Guennadi,
Guennadi Liakhovetski <g.liakhovetski@xxxxxx> wrote:
As for the actual question, I have no idea how they implement still
images: the UVC standard defines two methods for higher-resolution still
image capture: either using the "still image trigger control" or a
dedicated bulk pipeline (and a hardware button if there is one on your
camera?) FWIW, in either case I'm not sure whether the driver supports any
of those methods. I think bulk pipe support has been added to it at some
point, but what concerns switching... Not sure really, sorry.
The cam has a button but it is labled with a phone receiver so I guess it
is not there for taking still images. The MS-Software on Windows has two
buttons - one for taking a photo and one for recording a video. If you switch
the resolution to 1080p or "8MP", the video button gets disabled and all
someone can do is capturing a photo. More informations about the cam:
root@reis /root> v4l2-ctl --info
Driver Info (not using libv4l2):
Driver name : uvcvideo
Card type : Microsoft LifeCam Studio(TM)
Bus info : usb-/dev/usb-/dev/usb
Driver version: 2.6.38
Capabilities : 0x84000001
Video Capture
Streaming
root@reis /root> v4l2-ctl -L
brightness (int) : min=30 max=255 step=1
default=133 value=85
contrast (int) : min=0 max=10 step=1
default=5 value=5
saturation (int) : min=0 max=200 step=1
default=103 value=100
white_balance_temperature_auto (bool) : default=1 value=1
power_line_frequency (menu) : min=0 max=2 default=2 value=2
0: Disabled
1: 50 Hz
2: 60 Hz
white_balance_temperature (int) : min=2500 max=10000 step=1
default=4500 value=2500 flags=inactive
sharpness (int) : min=0 max=50 step=1
default=25 value=25
backlight_compensation (int) : min=0 max=10 step=1
default=0 value=0
exposure_auto (menu) : min=0 max=3 default=3 value=3
1: Manual Mode
3: Aperture Priority Mode
exposure_absolute (int) : min=1 max=10000 step=1
default=156 value=156 flags=inactive
pan_absolute (int) : min=-529200 max=529200
step=3600 default=0 value=0
tilt_absolute (int) : min=-432000 max=432000
step=3600 default=0 value=0
focus_absolute (int) : min=0 max=40 step=1
default=0 value=28
focus_auto (bool) : default=1 value=0
zoom_absolute (int) : min=0 max=317 step=1
default=0 value=0
root@reis /root>
The "nice" part is, that it has a real hardware focus which is fantastic
for my needs. The autofocus mode does not work with v4l2 somehow (image
gets not focused), but for my needs, a manual focus is OK. Thats why I
have autofocus disabled. I never tested capturing a video - maybe
autofocus works there when taking more than one frame because it needs
some time to focus ;)
But if you just try to be opportunistic and try cheese - it has a separate
setting for still images, so, maybe I'm way behind the time and everything
is working already?
The problem is:- The system is a headless system - so no monitor and no Xorg
installation (some X11 dependencies are installed tho) and I guess cheese has
no commandline interface?
Regards,
Oliver
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