refactored threading

mylib/config.py

@@ -4,9 +4,13 @@
 # Enter mail below to receive real-time email alerts
 # e.g., 'email@gmail.com'
 MAIL = ''
+# Enter the ip camera url (e.g., url = 'http://191.138.0.100:8040/video')
+url = ''
 
 # ON/OFF for mail feature. Enter True to turn on the email alert feature.
 ALERT = False
+# Threading ON/OFF
+Thread = False
 
 # Simple log to log the counting data
 Log = False

mylib/thread.py

@@ -0,0 +1,28 @@
+import cv2, threading, queue
+
+class ThreadingClass:
+  # initiate threading class
+  def __init__(self, name):
+    self.cap = cv2.VideoCapture(name)
+	# define an empty queue and thread
+    self.q = queue.Queue()
+    t = threading.Thread(target=self._reader)
+    t.daemon = True
+    t.start()
+
+  # read the frames as soon as they are available
+  # this approach removes OpenCV's internal buffer and reduces the frame lag
+  def _reader(self):
+    while True:
+      ret, frame = self.cap.read() # read the frames and ---
+      if not ret:
+        break
+      if not self.q.empty():
+        try:
+          self.q.get_nowait()
+        except queue.Empty:
+          pass
+      self.q.put(frame) # --- store them in a queue (instead of the buffer)
+
+  def read(self):
+    return self.q.get() # fetch frames from the queue one by one