From 81fd0eefac022d9f11473bc6aad00b60e7fd4167 Mon Sep 17 00:00:00 2001
From: Peter Johnson <johnson.peter@gmail.com>
Date: Fri, 2 Dec 2016 23:43:35 -0800
Subject: [PATCH] usbcvstream example: Print error from GrabFrame.

---
 examples/usbcvstream/usbcvstream.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/examples/usbcvstream/usbcvstream.cpp b/examples/usbcvstream/usbcvstream.cpp
index 6f9608a659..feea0b0a83 100644
--- a/examples/usbcvstream/usbcvstream.cpp
+++ b/examples/usbcvstream/usbcvstream.cpp
@@ -19,8 +19,11 @@ int main() {
   cv::Mat flip;
   for (;;) {
     uint64_t time = cvsink.GrabFrame(test);
+    if (time == 0) {
+      std::cout << "error: " << cvsink.GetError() << std::endl;
+      continue;
+    }
     std::cout << "got frame at time " << time << " size " << test.size() << std::endl;
-    if (time == 0) continue;
     cv::flip(test, flip, 0);
     cvsource.PutFrame(flip);
   }