;; Zoom effect - scale from center
;; Usage: python3 plan.py effects/zoom.sexp -p factor=1.2 | python3 execute.py - -d . -o output.mp4
;;
;; Parameters:
;;   factor: zoom multiplier (0.5 to 3.0, default: 1.2)
;;           <1 = zoom out, >1 = zoom in

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

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

  ;; Default parameter (overridden by -p factor=N)
  (def factor 1.2)

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