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How do you account for the spherical distortion of Optical Flow estimation in equirectangular images?

How would one use any of OpenCV's Optical Flow algorithms on a 360 degree panorama video stored in an equirectangular projection?

Doing this regularly would not account for the distortion, I think. Additionally how would one make sure there are no seams in the resulting optical flow field along the edges of this equirectangular projected image?

Take this video for example: