;; Edge detect effect - Canny edge detection
;; Usage: python3 plan.py effects/edge_detect.sexp -p low=50 -p high=150 | python3 execute.py - -d . -o output.mp4
;;
;; Parameters:
;;   low: lower threshold (10 to 100, default: 50)
;;   high: upper threshold (100 to 300, default: 150)
;;         edges between low-high are kept if connected to strong edges

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

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

  ;; Default parameters (overridden by -p low=N -p high=N)
  (def low 50)
  (def high 150)

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