Merge branch 'develop' into opencv

src/Frame.cpp

@@ -30,6 +30,9 @@
 
 #include "../include/Frame.h"
 
+#include <thread>    // for std::this_thread::sleep_for
+#include <chrono>    // for std::chrono::milliseconds
+
 using namespace std;
 using namespace openshot;
 
@@ -1079,7 +1082,7 @@ void Frame::Play()
 	while (transport1.isPlaying())
 	{
 		cout << "playing" << endl;
-		usleep(1000000);
+		std::this_thread::sleep_for(std::chrono::seconds(1));
 	}
 
 	cout << "DONE!!!" << endl;