Nvidia Optical Flow FRUC Accuracy issue

Hello,
I am using NvOFFRUCSample sample in the Nvidia Optical_Flow_SDK5.0.7 to generate interpolated frames in both the turning and the ampere architectures.

For some input frames, it fails to generate the interpolated frame properly. I observe the corruption around the ball and some players in the interpolated images.

I am sharing an example here:

  • two rendered input frames (resolution: 1080p)
  • output interpolated frame
    As you can see, the ball seems to be cut in half and there are corruptions around the legs of some players in the interpolated frame.

Can you please let me know what could cause this issue and how it could be improved?
Is it an accuracy issue?

Optical Flow Grid Size is set to 4 in the sample application by default.
Is there a way to change it? Would it help improve the accuracy?

Thank you

Baris Unal