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help file for using uvcdynctrl to disable webcam exposure/wb compensation #2

jywarren opened this issue Sep 4, 2011 · 4 comments


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jywarren commented Sep 4, 2011

uvc webcam control:

Read and write auto exposure:
- uvcdynctrl -s "Exposure, Auto" 1
- uvcdynctrl -g "Exposure, Auto"

Read and write auto white balance:
- uvcdynctrl -g "White Balance Temperature, Auto"
- uvcdynctrl -s "White Balance Temperature, Auto” 0

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Owner Author

Perhaps bundle Mac version with this:

dunno if it's open source but it's easy to use.

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The webcam I have from Jeff, which should be similar, but not identical to the one being shipped only has two controls:

[libwebcam] Invalid V4L2 control type encountered: ctrl_id = 0x00980001, name = 'User Controls', type = 6
[libwebcam] Invalid or unsupported V4L2 control encountered: ctrl_id = 0x00980001, name = 'User Controls'
[libwebcam] Unknown V4L2 user control ID encountered: 0x00980914 (V4L2_CID_USER_BASE + 20)
[libwebcam] Unknown V4L2 user control ID encountered: 0x00980915 (V4L2_CID_USER_BASE + 21)
Listing available controls for device video0:
  Horizontal Flip
  Vertical Flip

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Here is the dump from the test webcam:

~(branch:fed*) » uvcdynctrl -l         
Listing available devices:
video1   Venus USB2.0 Camera
Media controller device /dev/media1 doesn't exist
ERROR: Unable to list device entities: Invalid device or device cannot be opened. (Code: 5)

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Owner Author

wontfix; desktop version now deprecated

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