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