при записи avi файл оказывается поврежденным и не проигрывается

#include <opencv2/imgproc.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/videoio.hpp>
#include <Windows.h>
#include <iostream>

using namespace std;
using namespace cv;

class hwnd2Mat
{
public:
    hwnd2Mat(HWND hwindow, float scale = 1);
    virtual ~hwnd2Mat();
    virtual void read();
    Mat image;

private:
    HWND hwnd;
    HDC hwindowDC, hwindowCompatibleDC;
    int height, width, srcheight, srcwidth;
    HBITMAP hbwindow;
    BITMAPINFOHEADER  bi;
};

hwnd2Mat::hwnd2Mat(HWND hwindow, float scale)
{
    hwnd = hwindow;
    hwindowDC = GetDC(hwnd);
    hwindowCompatibleDC = CreateCompatibleDC(hwindowDC);
    SetStretchBltMode(hwindowCompatibleDC, COLORONCOLOR);

    RECT windowsize;    // get the height and width of the screen
    GetClientRect(hwnd, &windowsize);

    srcheight = windowsize.bottom;
    srcwidth = windowsize.right;
    height = (int)(windowsize.bottom * scale);
    width = (int)(windowsize.right * scale);

    image.create(height, width, CV_8UC4);

    // create a bitmap
    hbwindow = CreateCompatibleBitmap(hwindowDC, width, height);
    bi.biSize = sizeof(BITMAPINFOHEADER);    //http://msdn.microsoft.com/en-us/library/windows/window/dd183402%28v=vs.85%29.aspx
    bi.biWidth = width;
    bi.biHeight = -height;  //this is the line that makes it draw upside down or not
    bi.biPlanes = 1;
    bi.biBitCount = 32;
    bi.biCompression = BI_RGB;
    bi.biSizeImage = 0;
    bi.biXPelsPerMeter = 0;
    bi.biYPelsPerMeter = 0;
    bi.biClrUsed = 0;
    bi.biClrImportant = 0;

    // use the previously created device context with the bitmap
    SelectObject(hwindowCompatibleDC, hbwindow);
    read();
};

void hwnd2Mat::read()
{
    // copy from the window device context to the bitmap device context
    StretchBlt(hwindowCompatibleDC, 0, 0, width, height, hwindowDC, 0, 0, srcwidth, srcheight, SRCCOPY); //change SRCCOPY to NOTSRCCOPY for wacky colors !
    GetDIBits(hwindowCompatibleDC, hbwindow, 0, height, image.data, (BITMAPINFO*)&bi, DIB_RGB_COLORS);  //copy from hwindowCompatibleDC to hbwindow
};

hwnd2Mat::~hwnd2Mat()
{
    // avoid memory leak
    DeleteObject(hbwindow);
    DeleteDC(hwindowCompatibleDC);
    ReleaseDC(hwnd, hwindowDC);
};

int main()
{
    Mat ui(40, 400, CV_8UC3, Scalar(0, 130, 0));
    putText(ui, "Press Esc to stop capturing", Point(30, 30), FONT_HERSHEY_COMPLEX, 0.7,
        Scalar(0, 0, 255), 1);
    Mat bgrImg;
    hwnd2Mat capDesktop(GetDesktopWindow());
  
    VideoWriter writer;
    int codec = VideoWriter::fourcc('M', 'J', 'P', 'G');
    double fps = 10.0;
    string filename = "example_1000.avi";
    if (!writer.open(filename, codec, fps, capDesktop.image.size(), true)) {
        cerr << "Could not open the output video file for write. Error code: " << writer.getBackendName() << endl;
        return -1;
    }


    while (true)
    {
        capDesktop.read();
        cvtColor(capDesktop.image, bgrImg, COLOR_BGRA2BGR);
        writer << bgrImg;
        imshow("desktop capture", ui);
        int key = waitKey(5);

        if (key == 27)
            break;
    }
}