;; Swirl effect - spiral distortion from center
;; Usage: python3 plan.py effects/swirl.sexp -p strength=3 | python3 execute.py - -d . -o output.mp4
;;
;; Parameters:
;;   strength: swirl intensity (-10 to 10, default: 3)
;;             positive = clockwise, negative = counter-clockwise

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

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

  ;; Default parameter (overridden by -p strength=N)
  (def strength 3)

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