minor mask edit fix

diff --git a/motioneye/utils.py b/motioneye/utils.py
index 34e5bd71f3997217ce9a0967639a72bcbabb1d6d..95cea8aa40b656d7e4125d2fe2ed85ef29838eda 100644 (file)
--- a/motioneye/utils.py
+++ b/motioneye/utils.py
@@ -833,7 +833,7 @@ def build_editable_mask_file(camera_id, mask_lines, capture_width=None, capture_
         line_index_func = lambda y: y
         
     else:
-        line_index_func = lambda y: (len(mask_lines) - 1) * y / (ny - 1)
+        line_index_func = lambda y: (len(mask_lines) - 1) * y / ny
 
     rh = height / ny # rectangle height