how to convert sequence of images in to video? [closed]

asked 2019-01-03 09:37:02 -0500

arti gravatar image

updated 2019-01-03 09:40:25 -0500

berak gravatar image

Hello all, i want to convert sequence of images into video. i written the code it is not giving any error but the created .avi file is only 5.51 kb and nothing is playing with it. my code is

#include "opencv2/opencv.hpp"
#include <sstream>
#include <iostream>
#include "stdafx.h"




using namespace cv;
using namespace std;

Mat frame, img;
int i = 0;

int main(int, char**)
{


    Size frame_size(256, 256);


    //Size frame_size(frame_width, frame_height);
    int frames_per_second = 30;

    //Create and initialize the VideoWriter object 

    VideoWriter oVideoWriter("BIKINGSub.avi", VideoWriter::fourcc('M', 'J', 'P', 'G'),
        frames_per_second, frame_size, true);

    int z = 1;
    char filename[80];


    while (1)
    {


        sprintf_s(filename, "SubtractionResultsStatic/BIKING/biking_%d.png", z);
        Mat frame = imread(filename, 1);


        //If the VideoWriter object is not initialized successfully, exit the program




        //resize(frame, frame, Size(320, 180));



        oVideoWriter.write(frame); //writer the frame into the file

        imshow("MyVideo", frame); //show the frame in "MyVideo" window

        if (waitKey(10) == 27) //wait for 'esc' key press for 30ms. If 'esc' key is pressed, break loop
        {
            cout << "esc key is pressed by user" << endl;
            break;
        }

        z++;
    }



    printf("\ndone\n");
    return 0;
}

please suggest what i'm doing wrong?

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Closed for the following reason the question is answered, right answer was accepted by LBerger
close date 2019-01-03 23:18:03.629386

Comments

Mat frame = imread(filename, 1); what does it mean 1 ? use IMREAD_COLOR it will give you an image with three planes (not four as in png file)

check if rame is empty or not

 if (frame.empty())
       cout << "check file path"
       break;

a good idea is to close avi file too

    oVideoWriter.release()
LBerger gravatar imageLBerger ( 2019-01-03 09:43:02 -0500 )edit
1

are the images you read 256x256 ? (that's what you gave to the VideoWriter)

berak gravatar imageberak ( 2019-01-03 09:43:28 -0500 )edit

Use an ostringstream instead of the C sprintf.

For example:

#include <sstream>
#include <iostream>
using namespace std;

int main(void)
{
    ostringstream filename;

    int x = 123456;

    filename << "Some text " << x;

    cout << filename.str().c_str() << endl;

    return 0;
}
sjhalayka gravatar imagesjhalayka ( 2019-01-03 13:33:37 -0500 )edit

Thanks a lot sir...problem resolved.

arti gravatar imagearti ( 2019-01-03 23:16:59 -0500 )edit