Print OpenCV version when running CMake

CMakeLists.txt

@@ -5,6 +5,8 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake-mod
 
 find_package(OpenCV HINTS /usr/local/opt/opencv /usr/local/Cellar/opencv REQUIRED)
 
+message(STATUS "OpenCV version: ${OpenCV_VERSION}")
+
 set( NAME_SRC
     opencv_fb.cpp    
 )

opencv_fb.cpp

@@ -74,7 +74,7 @@ void display (Mat frame, framebuffer_info fb_info, ofstream& ofs) {
                     }
                 } break;
             default:
-                cerr << "Unsupported depth of framebuffer." << endl;
+                cerr << "Unsupported depth of framebuffer: " << framebuffer_depth << endl;
         }
     }
 }
@@ -111,6 +111,9 @@ int main(int, char**) {
         Mat displayFrame;
         while (true) {
             cap >> frame;
+            if (frame.empty()) {
+                continue;
+            }
             frame = frameEffects(frame);
             resize(frame, displayFrame, Size(fb_info.xres_virtual, fb_info.yres_virtual), 2, 2, INTER_CUBIC);
             display(displayFrame, fb_info, ofs);