From f9241f8861141a45ace26fbf7c34886ce1029186 Mon Sep 17 00:00:00 2001
From: Glenn Jocher <glenn.jocher@ultralytics.com>
Date: Sat, 28 Sep 2019 23:09:06 +0200
Subject: [PATCH] updates

---
 utils/datasets.py | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/utils/datasets.py b/utils/datasets.py
index 6c9bfe62..55e7f6be 100755
--- a/utils/datasets.py
+++ b/utils/datasets.py
@@ -216,9 +216,15 @@ class LoadStreams:  # multiple IP or RTSP cameras
 
     def update(self, index, cap):
         # Read next stream frame in a daemon thread
+        n = 0
         while cap.isOpened():
-            _, self.imgs[index] = cap.read()
-        time.sleep(0.01)  # 33.3 FPS to keep buffer empty
+            n += 1
+            # _, self.imgs[index] = cap.read()
+            cap.grab()
+            if n == 4:  # read every 4th frame
+                _, self.imgs[index] = cap.retrieve()
+                n = 0
+            time.sleep(0.01)  # wait time
 
     def __iter__(self):
         self.count = -1