opencv Loading and Saving Various Media Formats Loading Videos
Example
Show how to use cv::VideoCapture. Here is the example of loading video from file:
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/core/core.hpp"
#include <iostream>
using namespace cv;
VideoCapture videoSource;
Mat frame;
#define VIDEO_PATH "video.avi"
int main()
{
//Open video
if (!videoSource.open(VIDEO_PATH))
{
std::cout<<"Video not found at "<<VIDEO_PATH<<std::endl;
return 1; // Exit if fail
}
videoSource.set(CV_CAP_PROP_CONVERT_RGB, 1);
int cameraWidth = videoSource.get(CV_CAP_PROP_FRAME_WIDTH);
int cameraHeight = videoSource.get(CV_CAP_PROP_FRAME_HEIGHT);
float cameraAspectRatio = cameraWidth / cameraHeight;
std::cout <<"Camera resolution: " << cameraWidth<<", "<<cameraHeight<<" aspect ratio: "<<cameraAspectRatio<< std::endl;
while(true)
{
videoSource >> frame;
if(frame.empty())
break;
//Resize frame
cv::resize(frame, frame, cv::Size(320, 320 / cameraAspectRatio));
imshow("frame", frame);
waitKey(20);
}
waitKey(0);
return 0;
}
