VideoCapture获取视频中的图像帧

Posted 2020-11-26 cumtchw

int main(void)
{
    VideoCapture capture("F:\1.avi");//在嵌入式设备中这一句执行错误，挪到电脑上用VS没有错误，
    if (!capture.isOpened())
    {
        printf("fail to open 1.avi
");
    }

    long totalFrameNumber = capture.get(CV_CAP_PROP_FRAME_COUNT);
    printf("total frame number is:%f
", totalFrameNumber);

    long frameToStart = 1;
    capture.set(CV_CAP_PROP_POS_FRAMES, frameToStart);

    long frameToStop = 1000;

    double rate = capture.get(CV_CAP_PROP_FPS);
    printf("rate is :%d
", rate);

    bool stop = false;
    Mat frame;
    int delay = 1000 / rate;
    long currentFrame = frameToStart;
    char path[20] = {};
    int imageNum = 0;

    while (!stop)
    {
        if (!capture.read(frame))
        {
            printf("get frame fail!
");
            return -1;
        }

        sprintf(path, "F:\%d.jpg", imageNum);
        imageNum++;
        //保存获取到的帧数据
        imwrite(path, frame);

        if (currentFrame > frameToStop)
        {
            stop = true;
        }
        currentFrame++;
    }

    capture.release();
    return 0;
}