A quiet full-width band that visualizes a video codec's own P-frame change-detection decision: a grid of macroblocks sits mostly static, and every 220ms tick a small, capped subset is flagged changed with a brief outline flash and a slightly shifted tone while every other block is explicitly left untouched, exactly the sparse per-block change map a real codec decodes.
npx shadcn@latest add https://design.helpmarq.com/r/delta-frame-macroblock.jsondelta-frame-macroblock