How to solve problem with VideoCapture loading in linux ?

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Hi,

I've written the following code so as to load a mp4 video into VideoCapture, however, when I check the capture with isOpened() I get false . I'm 100% sure that the mp4 file is within the folder but my code is not able to open the capture.

#include <iostream> // for standard I/O
#include <opencv2/core/core.hpp>        // Basic OpenCV structures (cv::Mat, Scalar)
#include <opencv2/imgproc/imgproc.hpp>  // Gaussian Blur
#include <opencv2/highgui/highgui.hpp>  // OpenCV window I/O
#include <thread>
#include <future>

using namespace std;
using namespace cv;

int loadVideo( VideoCapture cap1, int seek_step,int thrd){
    int frameNum = 0;
    Mat frame;
     char c;
    cap1.set(CV_CAP_PROP_POS_FRAMES, seek_step );
    while (1){
        cap1 >> frame;
        if (frame.empty())
        {
            cout << " < < <  Channel stream ended!  > > > ";
            break;
        }

        cout << frameNum << endl;
        ++frameNum;
    }
    return frameNum;
}

int main(int argc, char *argv[])
{
    string sourceVideoPath;
    sourceVideoPath = "/home/azdoud/case1_320_200/case320_200fps20.mp4";
//    sourceVideoPath = "case320_240fps20.mp4";
//    sourceVideoPath = "C:\\opencvVid\\case1_320_240\\vid320_240fps25.mp4";
//    sourceVideoPath = argv[1];
    //start a new VideoCapture object in each of your 4 threads
    VideoCapture cap1(sourceVideoPath);

    cout << "Stream frame numbre : " << cap1.get(CV_CAP_PROP_FRAME_COUNT)<<endl;
    if (!cap1.isOpened())
    {
        cout  << "Could not open video " << sourceVideoPath << endl;
        return -1;
    }

    loadVideo(cap1,0,1);

    return 0;
}

I've put the video in the same folder but no good results.

[azdoud@video-processor CentOSsimple]$ cmake -DCMAKE_CXX_FLAGS="-std=c++11"
-- Configuring done
-- Generating done
-- Build files have been written to: /home/azdoud/CentOSsimple
[azdoud@video-processor CentOSsimple]$ make
Scanning dependencies of target main
[100%] Building CXX object CMakeFiles/main.dir/main.cpp.o
Linking CXX executable main
[100%] Built target main
[azdoud@video-processor CentOSsimple]$ ./main
Stream frame numbre : 0
Could not open video case320_240fps20.mp4

in I tested this code it works well, the image is in the same folder too

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <opencv/cv.h>
#include <opencv/highgui.h>
using namespace std;
using namespace cv;

int main()
{
    Mat src;

    /// Load image
    src = imread(  "/home/azdoud/im.jpg");
//    src = imread( "C:\\opencvVid\\images\\1.png" );
    cout << "Width : " << src.size().width << endl;
    cout << "Height: " << src.size().height << endl;
    return 0;
}

this the result

[azdoud@video-processor CentOSsimple]$ cmake -DCMAKE_CXX_FLAGS="-std=c++11"
-- Configuring done
-- Generating done
-- Build files have been written to: /home/azdoud/CentOSsimple
[azdoud@video-processor CentOSsimple]$ make
Scanning dependencies of target main
[100%] Building CXX object CMakeFiles/main.dir/main.cpp.o
Linking CXX executable main
[100%] Built target main
[azdoud@video-processor CentOSsimple]$ ./main
Width : 0
Height: 0

you may tell is a probelm of permission, I've checked that too by setting chmod to 666 on the folder and on mp4 file. How can you explain this, I can't understand why

any help thank you in advance.

here the getBuildInformation() output

 [azdoud@video-processor CentOSsimple]$ cmake -DCMAKE_CXX_FLAGS="-std=c++11"
 -- Configuring done
 -- Generating done
 -- Build files have been written to: /home/azdoud/CentOSsimple
 [azdoud@video-processor CentOSsimple]$ make
 Scanning dependencies of target main
 [100%] Building CXX object ...