OpenCV error in slowmoVideo

Usage of slowmoVideo shows an OpenCV error:

Have OpenCL:  true  useOpenCL: true
true 1 1
terminate called after throwing an instance of 'cv::Exception'
  what():  OpenCV(4.6.0) ./modules/video/src/optflowgf.cpp:1120: error: (-215:Assertion failed) _flow0.size() == prev0.size() && _flow0.channels() == 2 && _flow0.depth() == CV_32F in function 'calc'

Can anyone help?

bug already reported:

reported by me

I don’t know where to ask anymore. The github maintainer isn’t interested anymore as it sounds to me at his words.
The software itself (using the debian build) runs fine till render. The (command line initiated) render process starts till the OpenCV error - which pointed me to OpenCV and this board.

well, you can debug the program. with a debugger.

tell me how to fish please

I’m going to go with FFMpeg’s “minterpolate” feature from now on.
The thread can be closed.
Thank you and all the best.