prevWarped Optical flow Grey

[ChoclateRain]

I am running into issues when using prevWarped with optical flow, when the camera pans grey areas show up, do i add keyframes to -flow_relative_indices to fix this? should i leave the indices on 1? right now i have it on -flow_relative_indices 1,12,32 because i didnt fully understand what they ment (Just reread the readme) if i read correctly each input number (representing each frame you want) would be the image that prevWarped would switch to at that frame and after.

Does anybody have any tips they picked up on their experience with using prevWarped and/or optical flow?