error write avi file

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Hello there, i got started recently in opencv and i'm having the following error when i try run a code that convert the video to a grayscale:

OpenCV Error: Unsupported format or combination of formats (Gstreamer Opencv backend doesn't support this codec acutally.) in CvVideoWriter_GStreamer::open, file /home/daniel/Downloads/OpenCV-2.4.2/modules/highgui/src/cap_gstreamer.cpp, line 479 terminate called after throwing an instance of 'cv::Exception' what(): /home/daniel/Downloads/OpenCV-2.4.2/modules/highgui/src/cap_gstreamer.cpp:479: error: (-210) Gstreamer Opencv backend doesn't support this codec acutally. in function CvVideoWriter_GStreamer::open

the code is:

// argv[1]: input video file
// argv[2]: name of new output file
//
#include "cv.h"
#include "highgui.h"
int main( int argc, char* argv[] )
{
    CvCapture* capture = 0;
    capture = cvCreateFileCapture( argv[1] );
    if(!capture)
    {
        return -1;
    }
    IplImage *bgr_frame=cvQueryFrame(capture);//Init the video read
    double fps = cvGetCaptureProperty (
    capture,
    CV_CAP_PROP_FPS
    );

    CvSize size = cvSize(
    (int)cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_WIDTH),
    (int)cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_HEIGHT)
    );
    CvVideoWriter *writer = cvCreateVideoWriter("window",
    CV_FOURCC('M','J','P','G'),
    fps,
    size
    );
    IplImage* logpolar_frame = cvCreateImage(
    size,
    IPL_DEPTH_8U,
    3
    );
    while( (bgr_frame=cvQueryFrame(capture)) != NULL ) {
    cvLogPolar( bgr_frame, logpolar_frame,
    cvPoint2D32f(bgr_frame->width/2,
    bgr_frame->height/2),
    40,
    CV_INTER_LINEAR+CV_WARP_FILL_OUTLIERS );
    cvWriteFrame( writer, logpolar_frame );
    }
    cvReleaseVideoWriter( &writer );
    cvReleaseImage( &logpolar_frame );
    cvReleaseCapture( &capture );
    return(0);
}