Play video with SDL and OpenCV

//http://www.youtube.com/user/thecplusplusguy
//play a video with SDL and OpenCV
#include <opencv2/opencv.hpp>
#include <SDL/SDL.h>
using namespace cv;


SDL_Surface* convertToSDLSurface(const Mat& img)
{
    //"convert" it to older format, because I found conversation for that, and it's too late for me to rewrite it to the newer Mat
    IplImage opencvimg2=(IplImage)img;
    IplImage* opencvimg=&opencvimg2;

    //do the actual conversation to the good ol' SDL_Surface
    SDL_Surface *surface = SDL_CreateRGBSurfaceFrom((void*)opencvimg->imageData,opencvimg->width,opencvimg->height,opencvimg->depth*opencvimg->nChannels,opencvimg->widthStep,0xff0000, 0x00ff00, 0x0000ff, 0);

    return surface;
}

int main()
{
    //basic SDL stuff
    SDL_Init(SDL_INIT_EVERYTHING);
    SDL_Surface* screen=SDL_SetVideoMode(640,480,32,SDL_SWSURFACE);

    //open up that avi file (lot of formats are supported)
    VideoCapture vc("immortal.avi");

    //create an image, which is the current frame
  Mat image;


    //basic SDL stuff
    Uint32 start;
    SDL_Event event;
    bool running=true;
    while(running)
    {
        start=SDL_GetTicks();
        while(SDL_PollEvent(&event))
        {
            switch(event.type)
            {
                case SDL_QUIT:
                    running=false;
                    break;
                case SDL_KEYDOWN:
                    switch(event.key.keysym.sym)
                    {
                        case SDLK_ESCAPE:
                            running=false;
                            break;
                    }
            }
        }

        //read current frame to image
        vc >> image;
        //convert it to SDL_Surface
        SDL_Surface* frame=convertToSDLSurface(image);
        //render the whole thing out to 0,0 coordinate
        SDL_BlitSurface(frame,NULL,screen,NULL);
        //avoid memory leaks
        SDL_FreeSurface(frame);

        //show it
        SDL_Flip(screen);

    //regulate FPS, if you want to make the movie as quick as it was made, you can get the original FPS of the video with:
    //int FPS=vc.get(CV_CAP_PROP_FPS);
    //  if(1000.0/30>SDL_GetTicks()-start)
//          SDL_Delay(1000.0/30-(SDL_GetTicks()-start));
    }


    SDL_Quit();
}