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samples/cpp/videowriter_basic.cpp

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+/**
+  @file videowriter_basic.cpp
+  @brief A very basic sample for using VideoWriter and VideoCapture
+  @author PkLab.net
+  @date Aug 24, 2016
+*/
+
+#include <opencv2/core.hpp>
+#include <opencv2/videoio.hpp>
+#include <opencv2/highgui.hpp>
+#include <iostream>
+#include <stdio.h>
+
+using namespace cv;
+using namespace std;
+
+int main(int, char**)
+{
+    Mat src;
+    // use default camera as video source
+    VideoCapture cap(0);
+    // check if we succeeded
+    if (!cap.isOpened()) {
+        cerr << "ERROR! Unable to open camera\n";
+        return -1;
+    }
+    // get one frame from camera to know frame size and type
+    cap >> src;
+    // check if we succeeded
+    if (src.empty()) {
+        cerr << "ERROR! blank frame grabbed\n";
+        return -1;
+    }
+    bool isColor = (src.type() == CV_8UC3);
+
+    //--- INITIALIZE VIDEOWRITER
+    VideoWriter writer;
+    int codec = VideoWriter::fourcc('M', 'J', 'P', 'G');  // select desired codec (must be available at runtime)
+    double fps = 25.0;                          // framerate of the created video stream
+    string filename = "./live.avi";             // name of the output video file
+    writer.open(filename, codec, fps, src.size(), isColor);
+    // check if we succeeded
+    if (!writer.isOpened()) {
+        cerr << "Could not open the output video file for write\n";
+        return -1;
+    }
+
+    //--- GRAB AND WRITE LOOP
+    cout << "Writing videofile: " << filename << endl
+         << "Press any key to terminate" << endl;
+    for (;;)
+    {
+        // check if we succeeded
+        if (!cap.read(src)) {
+            cerr << "ERROR! blank frame grabbed\n";
+            break;
+        }
+        // encode the frame into the videofile stream
+        writer.write(src);
+        // show live and wait for a key with timeout long enough to show images
+        imshow("Live", src);
+        if (waitKey(5) >= 0)
+            break;
+    }
+    // the videofile will be closed and released automatically in VideoWriter destructor
+    return 0;
+}