Face Tracker PTZ Limitations

Currently the PTZ control feature is under development state. There are some limitations when you use this

• When changing zoom, a user need to adjust gain (Kp) of pan and tilt.

  • Workaround: Users are suggested to set the slider Max control (zoom) to 0, and manually adjust gain Kp. The gain for pan and tilt should be around 40dB to 60dB but heavily depend on the zoom.
  • In future, the gain would be automatically adjusted by the zoom. Currently, there is a problem to get current state of zoom through VISCA protocol.
  • Only VISCA-over-IP experimentally automatically reuduces gain internally. However, since the zoom vs. binary code mapping depends on camera models, it's not accurate for some cameras.

• Difference of device types

  • Not all features are implemented for all device types.

    	through PTZ Controls	VISCA-over-TCP	VISCA-over-IP
    Pan and tilt control	Yes	Yes	Yes
    Zoom control	Yes (>= 0.4.1)	Yes	Yes
    Gain reduction by zoom	Not yet	Yes	No
    Requirements	obs-ptz	n/a	n/a
    Development status	Experimental		Deprecated

  • ONVIF If someone requires this protocol, please leave a comment.