diff --git a/app.py b/app.py
index fee329f..19c3749 100644
--- a/app.py
+++ b/app.py
@@ -83,9 +83,9 @@ def worker(id,source,region=None,stream=False):
                 print("sleep",2*delay - (time.time()*1000 - bgn))
                 time.sleep((2*delay - (time.time()*1000 - bgn))/1000)
             bgn = (time.time()*1000)
-            # ret, frame = cap.read()
-            # del(ret)
-            # del(frame)
+            ret, frame = cap.read()
+            del(ret)
+            del(frame)
             ret, frame = cap.read()
             use += " read:"+str((time.time()*1000) - bgn)
             if not ret: