Seeing this might be a file specific compatibility issue. Can you try converting your input using Handbrake and then try importing the converted version back into Video AI for processing?
Drag and drop your video to import it
I recommend going to the “dimensions” tab and under “resolution limit” > none
I also recommend going to the “video” tab and under “framerate (FPS)” > Same as source
Then click “start”
This will ensure that it retains the original resolution and frame rate with the converted file.