Update app.py

app.py

@@ -158,11 +158,12 @@ def infer(url_in,interpolation,fps_output,resize_n,winsize,o_flow):
       else:
         rgb = nxt
           
-      alpha = 1.0/len(frames_list)
+      alpha = 1.0/len(result_frames)
       beta = (1.0 - alpha)
       res = cv2.addWeighted(rgb, alpha, res, beta, 0.0, res)
       prvs = nxt
 
+    print("averaged frames: " + str(len(result_frames)))
     cv2.imwrite('opticalfb.png', res)
     depth_map.release()
     cv2.destroyAllWindows()