如何使用OpenCV从磁盘播放视频文件? [英] How to play a video file from my disk using OpenCV.?

问题描述

请帮助我完成上述任务.我是openCV的新手.我的系统中安装了OpenCV 2.2，并使用VC ++ 2010 Express作为IDE.我的笔记本电脑中没有内置摄像头... 只是我学会了如何加载图像.我非常渴望从磁盘上加载视频文件(最好是mp4，flv格式)，并希望使用openCV播放它.

Please help me in achieving above task.I'm newbie to openCV. I have OpenCV 2.2 installed in my system and using VC++ 2010 Express as IDE. I don't have inbuilt webcam in my laptop... just i learnt how to load image. I'm very eager to load a video file from my disk(preferably mp4 , flv format) and wish to play it using openCV.

推荐答案

使用OpenCV的 C 接口(在Windows机器上对我来说效果更好)，加载视频文件的功能是cvCaptureFromAVI().之后，您需要使用传统的循环来通过cvQueryFrame()检索帧，然后通过cvShowImage()将其显示在使用cvNamedWindow()创建的窗口中.

Using the C interface of OpenCV (which have worked better for me on Windows boxes), the function to load the video file is cvCaptureFromAVI(). After that, you need to use the traditional loop to retrieve frames throughcvQueryFrame() and then cvShowImage() to display them on a window created with cvNamedWindow().

CvCapture *capture = cvCaptureFromAVI("video.avi");
if(!capture)
{   
    printf("!!! cvCaptureFromAVI failed (file not found?)\n");
    return -1; 
}   

int fps = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);
printf("* FPS: %d\n", fps);

cvNamedWindow("display_video", CV_WINDOW_AUTOSIZE);

IplImage* frame = NULL;
char key = 0;

while (key != 'q')
{   
    frame = cvQueryFrame(capture);
    if (!frame)
    {   
        printf("!!! cvQueryFrame failed: no frame\n");
        break;
    }

    cvShowImage("display_video", frame);

    key = cvWaitKey(1000 / fps);
}

cvReleaseCapture(&capture);
cvDestroyWindow("display_video");

此博客文章带来了一些有关您要完成的任务的额外信息.

This blog post brings a little extra info on the task you are trying to accomplish.

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