;; Film grain effect - analog film noise
;; Usage: python3 plan.py effects/film_grain.sexp -p intensity=0.25 | python3 execute.py - -d . -o output.mp4
;;
;; Parameters:
;;   intensity: grain amount (0.05 to 0.5, default: 0.25)

(recipe "film_grain"
  :version "1.0"
  :encoding (:codec "libx264" :crf 20 :preset "medium" :audio-codec "aac" :fps 30)

  (effect film_grain :path "sexp_effects/effects/film_grain.sexp")

  ;; Default parameter (overridden by -p intensity=N)
  (def intensity 0.25)

  (def video (source :path "monday.webm"))
  (def clip (-> video (segment :start 0 :duration 10)))
  (def result (-> clip (effect film_grain :intensity intensity)))
  result)