SDL YUV display, screen freezes but code still running

sdl_yuv.cpp

int _tmain(int argc, _TCHAR* argv[])
{
  FILE *in_fp;
	int frameNum = 10000;
	Uint32 screenWidth = 0, screenHeight = 0;
	Uint32 frameSize = 0;
	Uint8 *frame, *displayFrame;
	SDL_RWops *handle = nullptr;
	Uint32 readStart, readEnd, readTime, showStart, showEnd, showTime;

	Uint32 pixfmt = SDL_PIXELFORMAT_IYUV;
	SDL_DisplayMode *mode = new SDL_DisplayMode;
	SDL_Window  *window;
	SDL_Renderer *renderer;
	SDL_Texture *texture;
	SDL_Rect displayrect;
	//SDL_Event event;
	//SDL_RendererInfo *rendererInfo = new SDL_RendererInfo;

	if(SDL_Init(SDL_INIT_EVERYTHING)!=0)
	{
		cout << SDL_GetError() << endl;
		SDL_Quit();
		return 1;
	}
	SDL_GetDesktopDisplayMode(0, mode);
	screenWidth  = mode->w;
	screenHeight = mode->h;
	frameSize = screenHeight * screenWidth * 3 / 2;

	//SDL_CreateWindowAndRenderer(0, 0, SDL_WINDOW_FULLSCREEN_DESKTOP, &window, &renderer);
	//SDL_CreateWindowAndRenderer(1600,900, SDL_WINDOW_SHOWN, &window, &renderer);
	//if(window == NULL || renderer == NULL)
	//{
	//	cout << SDL_GetError() << endl;
	//	SDL_Quit();
	//	return 1;
	//}
	//SDL_GetRendererInfo(renderer, rendererInfo);

	window = SDL_CreateWindow("Test", 0, 0, screenWidth, screenHeight, SDL_WINDOW_FULLSCREEN_DESKTOP);
	if(window == NULL)
	{
		cout << SDL_GetError() << endl;
		SDL_Quit();
		return 1;
	}

	renderer = SDL_CreateRenderer(window, -1 , SDL_RENDERER_ACCELERATED | SDL_RENDERER_TARGETTEXTURE);
	if(renderer == NULL)
	{
		cout << SDL_GetError() << endl;
		SDL_Quit();
		return 1;
	}

	texture = SDL_CreateTexture(renderer, pixfmt, SDL_TEXTUREACCESS_STREAMING, screenWidth, screenHeight);
	if(texture == NULL)
	{
		cout << SDL_GetError() << endl;
		SDL_Quit();
		return 1;
	}

	fopen_s(&in_fp, "C:\\air\\air.yuv", "rb");
	displayFrame = (Uint8 *)malloc((screenWidth * screenHeight) * 3 / 2);
	frame   = (Uint8 *)malloc((screenWidth * screenHeight) * 3 / 2);

	for(int fn = 0; fn < frameNum; fn++)
	{
		readStart = SDL_GetTicks();
		if(fread(frame, frameSize, 1, in_fp) < 1)
		{
			fseek(in_fp, 0, SEEK_SET);
			fread(frame, frameSize, 1, in_fp);
		}
		handle = SDL_RWFromMem(frame, frameSize);
		if(handle == NULL)
		{
			cout << SDL_GetError() << endl;
			SDL_Quit();
			return 1;
		}
		SDL_RWread(handle, displayFrame, frameSize, 1);

		
	
		readEnd = SDL_GetTicks();
		readTime = readEnd - readStart;
		//cout << readTime << endl;

	/*	if(readTime < 20)
		{
			SDL_Delay(20 - readTime);
		} 
	*/
		
		
		displayrect.x = 0;
		displayrect.y = 0;
		displayrect.w = screenWidth;
		displayrect.h = screenHeight;

		if(SDL_UpdateTexture(texture, NULL, displayFrame, screenWidth*SDL_BYTESPERPIXEL(pixfmt)) !=0)
		{
			cout << SDL_GetError() << endl;
			SDL_Quit();
			return 1;
		}

		
		if(SDL_RenderClear(renderer) !=0)
		{
			cout << SDL_GetError() << endl;
			SDL_Quit();
			return 1;
		}
		if(SDL_RenderCopy(renderer, texture, NULL, &displayrect)!=0)
		{
			cout << SDL_GetError() << endl;
			SDL_Quit();
			return 1;
		}
		showStart = SDL_GetTicks();
		SDL_RenderPresent(renderer);
		showEnd = SDL_GetTicks();
		showTime = showEnd - showStart;
		if(showTime > 2)
		{
			cout << fn << ", " << showTime << endl;
		}
	}
	SDL_DestroyRenderer(renderer);
	SDL_RWclose(handle);
	fclose(in_fp);
	
	SDL_Quit();
	return 0;
}