From 9d3b82bf518798635ddc9f1de8446ff37a5e2281 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Sat, 11 Jan 2014 16:16:39 +0100
Subject: prevent empty video frame upon race

---
 FTNoIR_Tracker_PT/pt_video_widget.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'FTNoIR_Tracker_PT')

diff --git a/FTNoIR_Tracker_PT/pt_video_widget.cpp b/FTNoIR_Tracker_PT/pt_video_widget.cpp
index 38c49567..75fa18a0 100644
--- a/FTNoIR_Tracker_PT/pt_video_widget.cpp
+++ b/FTNoIR_Tracker_PT/pt_video_widget.cpp
@@ -21,7 +21,7 @@ void PTVideoWidget::update_image(const cv::Mat& frame)
     const int rate = 40;
     if (freshp)
         return;
-    if (!update_throttler.isValid() || update_throttler.elapsed() > rate)
+    if (frame.empty() || !update_throttler.isValid() || update_throttler.elapsed() > rate)
     {
         _frame = frame.clone();
         update_throttler.restart();
-- 
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