OpenCV读取视频文件并显示

OpenCV Show Video.cpp

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

int main( int argc ,char ** argv){
    CvCapture * capture = cvCreateFileCapture ("tree.avi");

    if(capture==NULL)
    {
        printf("视频文件读取失败");
        return 1;
    };

    // 获取视频帧率
    double fps = cvGetCaptureProperty(capture, CV_CAP_PROP_FPS );

    // 计算每帧播放的时间
    int vfps = 1000 / fps;
    // printf("%5.1f\t%5d\n", fps, vfps);

    // 获取视频中有多少帧
    double frames = cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_COUNT);
    printf("共 %f 帧\n", frames);

    // 定义窗口
    cvNamedWindow("example", CV_WINDOW_AUTOSIZE);

    IplImage * frame;
    while(true)
    {
        // 抓取帧数据
        frame = cvQueryFrame( capture );
        // 读取该帧在视频中的相对位置
        float ratio = cvGetCaptureProperty(capture, CV_CAP_PROP_POS_AVI_RATIO);
        // printf("%f\n", ratio);
        
        if(!frame) break;

        // 显示视频
        cvShowImage("example",frame);

        char c = cvWaitKey(vfps);

        // 按esc键退出
        if(c == 27 )break;
    }

    // 释放资源
    cvReleaseCapture(&capture);
    cvDestroyWindow("example");
}