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ONVIF PTZ not working with some IP cameras

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Not all the cameras support the PTZ “relative mode” or “absolute mode” by invoking ONVIFPTZSetPosition.

If ONVIFPTZSetPosition returns an error, use instead the “continous move” mode with ONVIFPTZStartMove.

If a timeout is specified to ONVIFPTZStartMove, it behaves similarly to the relative mode, stopping the PTZ after the timeout. E.g. with a timeout of 100ms:
VideoGrabber.ONVIFPTZStartMove (“Pan”, true, 1.0, 100)

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