#!/bin/bash

IN="input.mp4"
OUT="input-DIFF.mp4"

ffmpeg \
  -y \
  -i "$IN" \
  -vf "tblend=all_mode=difference,format=gray,eq=contrast=4.0" \
  -an \
  -c:v libx264 \
  -preset veryfast \
  -crf 18 \
  -pix_fmt yuv420p \
  "$OUT"

echo "Saved: $OUT"