opencv讀視頻失敗的原因

示例代碼

#include <opencv2/core/core.hpp>      
#include <opencv2/highgui/highgui.hpp>      
#include <opencv2/imgproc/imgproc.hpp>     
#include <opencv2/imgcodecs.hpp>  
#include <opencv2/videoio.hpp>   
#include <iostream>    
using namespace std;
using namespace cv;

int main()
{
#if 0
    //-------------【1】讀取視頻文件-------------
    VideoCapture capture;
    capture.open("xxxpath/input.h264");
    //方式二：VideoCapture capture("xxxpath/input.h264");
 
    //-------------【2】判斷視頻讀取是否正確-------------
    if (!capture.isOpened())
    {
        cout << "打開視頻文件失敗，請重新輸入正確路徑！" << endl;
        system("pause");
        return -1;
    }
 
    //-------------【3】獲取視頻相關信息-------------
    //獲取視頻相關信息——幀數
    long nTotalFrame = capture.get(CV_CAP_PROP_FRAME_COUNT);
    cout << "幀數 = " << nTotalFrame << endl;
    //獲取視頻相關信息——幀像素寬/高
    int frameHeight = capture.get(CV_CAP_PROP_FRAME_HEIGHT);
    int frameWidth = capture.get(CV_CAP_PROP_FRAME_WIDTH);
    cout << "幀像素高 = " << frameHeight << endl;
    cout << "幀像素寬 = " << frameWidth << endl;
    //獲取視頻相關信息——幀率
    double FrameRate = capture.get(CV_CAP_PROP_FPS);
    cout << "幀率 = " << FrameRate << endl;
 
    //--------------【4】循環顯示每一幀---------------
    long nCount = 1;    //計數，當前幀號

    bool flag = true;
    while (flag)
    {
        //輸出當前幀號
        cout << "當前幀號: " << nCount << endl;
        Mat frameImg;//定義一個Mat變量，用於存儲每一幀的圖像
        capture >> frameImg;
        //判斷當前讀取文件
        if (frameImg.empty())
        {
            break;
        }
        imshow("讀取視頻", frameImg);    //顯示當前幀    
        //按下鍵盤上Q或q鍵退出
        if (char(waitKey(40)) == 'q' || char(waitKey(40)) == 'Q') //每幀畫面存在40ms，即1秒25幀
        {
            break;
        }
        nCount++;

        flag = false;
    }
    //視頻釋放
    capture.release();
#endif

    std::string path = "xxxpath";
    cv::VideoCapture * m_Cap = new cv::VideoCapture(path);
    if (m_Cap) {
        std::cout << "video: " << path << " is opened !" << std::endl;
    }
    else {
        std::cout << "video: " << path << " opened failed !" << std::endl;
    }

    if( !m_Cap->isOpened() )
    {
        std::cout << "***Could not initialize capturing...***\n";
    }


    cv::Mat frame;

    bool flag = true;
    while (m_Cap->read(frame) && flag) {
		
          //flag = false;
    }
    m_Cap->release();


    return 0;
}

以上程序在ubuntu電腦上能夠跑通，正常讀取視頻，但是在開發板上不能讀取，isOpened()函數返回false

查看原因是由於電腦上的libopencv_videoio庫編譯時攜帶了ffmpeg，而板子上沒有，具體查看下圖
電腦上的

板子上的

利用ffmpeg和opencv進行視頻的解碼播放
參考
https://www.jianshu.com/p/6ef3c18d61b0

問題參考
https://bbs.huaweicloud.com/forum/thread-99217-1-1.html