uplooking camera exposure settings change at OpenPnP startup

[Harm Hongerkamp]

when OpenPnP is turned on it increments the exposure setting of the bottom camera with 5, camera is a logitech C270.
  OS: Pop!_OS 20.04 LTS x86_64

i made sure all of the auto-settings are turned of:
v4l2-ctl --all
Driver Info:
    Driver name      : uvcvideo
    Card type        : UVC Camera (046d:0825)
    Bus info         : usb-0000:00:14.0-1
    Driver version   : 5.8.18
    Capabilities     : 0x84a00001
        Video Capture
        Metadata Capture
        Streaming
        Extended Pix Format
        Device Capabilities
    Device Caps      : 0x04200001
        Video Capture
        Streaming
        Extended Pix Format
Priority: 2
Video input : 0 (Camera 1: ok)
Format Video Capture:
    Width/Height      : 640/480
    Pixel Format      : 'YUYV' (YUYV 4:2:2)
    Field             : None
    Bytes per Line    : 1280
    Size Image        : 614400
    Colorspace        : sRGB
    Transfer Function : Default (maps to sRGB)
    YCbCr/HSV Encoding: Default (maps to ITU-R 601)
    Quantization      : Default (maps to Limited Range)
    Flags             :
Crop Capability Video Capture:
    Bounds      : Left 0, Top 0, Width 640, Height 480
    Default     : Left 0, Top 0, Width 640, Height 480
    Pixel Aspect: 1/1
Selection Video Capture: crop_default, Left 0, Top 0, Width 640, Height 480, Flags:
Selection Video Capture: crop_bounds, Left 0, Top 0, Width 640, Height 480, Flags:
Streaming Parameters Video Capture:
    Capabilities     : timeperframe
    Frames per second: 30.000 (30/1)
    Read buffers     : 0
                     brightness 0x00980900 (int)    : min=0 max=255 step=1 default=128 value=128
                       contrast 0x00980901 (int)    : min=0 max=255 step=1 default=32 value=32
                     saturation 0x00980902 (int)    : min=0 max=255 step=1 default=32 value=32
 white_balance_temperature_auto 0x0098090c (bool)   : default=1 value=0
                           gain 0x00980913 (int)    : min=0 max=255 step=1 default=64 value=192
           power_line_frequency 0x00980918 (menu)   : min=0 max=2 default=2 value=2
                0: Disabled
                1: 50 Hz
                2: 60 Hz
      white_balance_temperature 0x0098091a (int)    : min=0 max=10000 step=10 default=4000 value=1840
                      sharpness 0x0098091b (int)    : min=0 max=255 step=1 default=24 value=24
         backlight_compensation 0x0098091c (int)    : min=0 max=1 step=1 default=0 value=0
                  exposure_auto 0x009a0901 (menu)   : min=0 max=3 default=3 value=1
                1: Manual Mode
                3: Aperture Priority Mode
              exposure_absolute 0x009a0902 (int)    : min=1 max=10000 step=1 default=166 value=1005
         exposure_auto_priority 0x009a0903 (bool)   : default=0 value=0

further more: when i start OpenPnp from the terminal the terminal displays lots of errors like these whenever i try to access the camera from OpenPnP:
[DBG ] FOURCC = YUYV
[ERR ] setProperty (ID=12) failed on VIDIOC_S_CTRL (errno 110)
[ERR ] setProperty (ID=6) failed on VIDIOC_S_CTRL (errno 110)
[ERR ] setProperty (ID=7) failed on VIDIOC_S_CTRL (errno 110)
[ERR ] setAutoProperty (ID=1) failed on VIDIOC_S_CTRL (errno 34)
[ERR ] getPropertyLimits (ID=2) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getAutoProperty (ID=2) failed on VIDIOC_G_CTRL (errno 22)
[ERR ] getPropertyLimits (ID=2) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getPropertyLimits (ID=2) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getPropertyLimits (ID=2) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getProperty (ID=2) failed on VIDIOC_G_CTRL (errno 22)
[ERR ] getAutoProperty (ID=2) failed on VIDIOC_G_CTRL (errno 22)
[ERR ] getAutoProperty (ID=5) failed on VIDIOC_G_CTRL (errno 22)
[ERR ] getAutoProperty (ID=5) failed on VIDIOC_G_CTRL (errno 22)
[ERR ] getPropertyLimits (ID=9) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getPropertyLimits (ID=9) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getPropertyLimits (ID=9) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getPropertyLimits (ID=9) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getProperty (ID=9) failed on VIDIOC_G_CTRL (errno 22)
[ERR ] getPropertyLimits (ID=10) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getPropertyLimits (ID=10) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getPropertyLimits (ID=10) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getPropertyLimits (ID=10) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getProperty (ID=10) failed on VIDIOC_G_CTRL (errno 22)
[ERR ] getPropertyLimits (ID=3) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getPropertyLimits (ID=3) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getPropertyLimits (ID=3) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getPropertyLimits (ID=3) failed on VIDIOC_QUERYCTRL (errno 22)
[ERR ] getProperty (ID=3) failed on VIDIOC_G_CTRL (errno 22)

whenever I manually set the exposure in OpenPnP, the new value seems to be ignored.

Is there a fault in my software or in my driver that makes it impossible for openpnp to set the expossure?i tried to create a diagnosics report but that failed...

I hope I provided enough information, if not I will send whatever is needed.

[Duncan Ellison]

Most likely is that your camera, being a webcam, just ignores any settings you try to send to it.  

This is a known issue with cameras outside the known good ones.

It's VERY unlikely to be an issue with OpenPnP itself.

Duncan

[Harm Hongerkamp]

thank you for your reaction.

I was afraid of that, we however choose this particular webcam because it was known to have good matching with openpnp: https://www.liteplacer.com/phpBB/viewtopic.php?f=4&t=144

can a solution be to just let it on auto-exposure and place the camera in a "black-box" so I have 100% control over the lightning?

Op do 25 feb. 2021 om 16:03 schreef Duncan Ellison <duncan_...@colnewater.com>:

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[Jason von Nieda]

Is it possible that something else is using the camera, or that there is a permissions problem? Based on the output from v4l2-ctl --all I would expect that OpenPnP could control these settings, and I do seem to remember that this particular model is well supported.

I think others are using this camera with OpenPnP - maybe someone can jump in?

Jason

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[Harm Hongerkamp]

what worries me the most are the VIDIOC_G_* errors, I can't find any results when is google them...

[Harm Hongerkamp]

permissions are:

camera: crw-rw----+ 1 root video 81, 0 Feb 25 09:26 /dev/video0, i dont see a problem there.

Op do 25 feb. 2021 om 16:28 schreef Harm Hongerkamp <ha...@evabits.com>: