How can I extract metadata from video?

asked Sep 17 '13

Ana M. gravatar image

updated Sep 17 '13

I have a video with metadata. I have obtained all the images from the video:

#include <stdio.h>
#include <stdlib.h>
#include<opencv\cv.h>
#include<opencv\highgui.h>

int main( int argc, char** argv )
{  

    printf("* Filename: %s\n", "D:/Video_clip_2.mpg");   

    CvCapture *capture = cvCaptureFromAVI("D:/Video_clip_2.mpg");
    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);

    IplImage* frame = NULL;
    int frame_number = 0;
    char key = 0;   

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

        char filename[100];
        strcpy(filename, "D:/imagenes/frame_");

        char frame_id[30];
        itoa(frame_number, frame_id, 10);
        strcat(filename, frame_id);
        strcat(filename, ".jpg");

        printf("* Saving: %s\n", filename);

        if (!cvSaveImage(filename, frame))
        {
            printf("!!! cvSaveImage failed\n");
            break;
        }

        frame_number++;

        // quit when user press 'q'
        key = cvWaitKey(1000 / fps);
    }

    // free resources
    cvReleaseCapture(&capture);

    return 0;
}

Now I want extract the metadata (longitude, latitude, altitude, yaw angle, pitch angle, roll angle) from video for each image. How can I extract the metadata?

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Comments

opencv can't extract metadata, not even from images.

also i kinda doubt, that your mpeg even contains the information you mentioned.

berak gravatar imageberak (Sep 17 '13)edit

Thanks Berak, but my mpeg file contains the image of the video accompanied with the metadata of the camera (geotagging).

Ana M. gravatar imageAna M. (Sep 17 '13)edit

@Ana M. Were you able to solve this?

prakharmohan gravatar imageprakharmohan (Mar 14 '14)edit