;; CRT effect - old TV/monitor look with scanlines and vignette
;; Usage: python3 plan.py effects/crt.sexp -p line_spacing=3 -p vignette_amount=0.3 | python3 execute.py - -d . -o output.mp4
;;
;; Parameters:
;;   line_spacing: pixels between scanlines (1 to 8, default: 3)
;;   vignette_amount: edge darkening strength (0 to 1, default: 0.3)

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

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

  ;; Default parameters (overridden by -p line_spacing=N -p vignette_amount=N)
  (def line_spacing 3)
  (def vignette_amount 0.3)

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