diff --git a/tools/vid2img_sthv2.py b/tools/vid2img_sthv2.py
index 461bca96..37f872d5 100755
--- a/tools/vid2img_sthv2.py
+++ b/tools/vid2img_sthv2.py
@@ -12,9 +12,9 @@
 
 
 def split(l, n):
-    """Yield successive n-sized chunks from l."""
-    for i in range(0, len(l), n):
-        yield l[i:i + n]
+    """Yield successive almost equal sized n chunks from l."""
+    for i in range(n):
+        yield l[i::n]
 
 
 def extract(video, tmpl='%06d.jpg'):