Update app.py

app.py

@@ -131,14 +131,13 @@ def infer(url_in,interpolation,fps_output):
     ret, frame1 = depth_map.read()
     prvs = cv2.cvtColor(frame1, cv2.COLOR_RGB2GRAY)
     res = np.zeros_like(prvs)
-    while(1):
+    while(depth_map.isOpened()):
       ret, frame2 = depth_map.read()
-      if not ret:
-        print('No frames grabbed!')
+      if ret == False:
         break
       next = cv2.cvtColor(frame2, cv2.COLOR_RGB2GRAY)
       flow = cv2.calcOpticalFlowFarneback(prvs, next, None, 0.5, 3, 15, 3, 5, 1.2, 0)
-      alpha = 0.5
+      alpha = 1.0/len(frames_list)
       beta = (1.0 - alpha)
       res = cv2.addWeighted(flow, alpha, res, beta, 0.0)
       prvs = next