Stopping the flicker when you restyle a video frame by frame

Run a diffusion restyle on every frame of a clip, one frame at a time, and the still images look great. Then you play them back and the whole thing boils. Textures crawl, colors pulse, a brick wall shifts its grout lines every frame. The model did nothing wrong on any single frame. It just made a slightly different choice each time, and at 24 frames a second your eye reads those differences as flicker. This is a walkthrough of the code that kills that flicker. The trick is to stop restyling…