I met compiling error while compiling: no known conversion from ‘cv::DenseOpticalFlow*’ to ‘int’

[lixiangpengcs]

I use opencv version is 2.4.13.6 and I don't know why I met this problem. what version opencv do you use while compiling.
/usr/local/include/opencv2/core/operations.hpp:2647:31: note: no known conversion from ‘cv::DenseOpticalFlow*’ to ‘int’

[gulvarol]

I used OpenCV 3, sorry for the lack of documentation. For OpenCV 2.4, you can have a look at this example: https://github.com/opencv/opencv/blob/2.4/samples/gpu/optical_flow.cpp