void WriteYuv()

{

    cv::VideoCapture vc;

    bool flag = vc.open("S1000008.avi");

    if (!flag)

    {

        printf("avi file open error \n");

        system("pause");

        exit(-);

    }  

    int frmCount = vc.get(CV_CAP_PROP_FRAME_COUNT);

    frmCount -= ;

    printf("frmCount: %d \n", frmCount);  

    int w = vc.get(CV_CAP_PROP_FRAME_WIDTH);

    int h = vc.get(CV_CAP_PROP_FRAME_HEIGHT);

    int bufLen = w*h*/;

    unsigned char* pYuvBuf = new unsigned char[bufLen];

    FILE* pFileOut = fopen("result.yuv", "w+");

    if (!pFileOut)

    {

        printf("pFileOut open error \n");

        system("pause");

        exit(-);

    }

    printf("pFileOut open ok \n");  

    for (int i=; i<frmCount; i++)

    {

        printf("%d/%d \n", i+, frmCount);  

        cv::Mat srcImg;

        vc>>srcImg;  

        cv::imshow("img", srcImg);

        cv::waitKey();  

        cv::Mat yuvImg;

        cv::cvtColor(srcImg, yuvImg, CV_BGR2YUV_I420);

        memcpy(pYuvBuf, yuvImg.data, bufLen*sizeof(unsigned char));  

        fwrite(pYuvBuf, bufLen*sizeof(unsigned char), , pFileOut);

    }  

    fclose(pFileOut);

    delete[] pYuvBuf;

}  

void DisplayYUV()

{

    int w = ;

    int h = ;

    printf("yuv file w: %d, h: %d \n", w, h);  

    FILE* pFileIn = fopen("result.yuv", "rb+");

    int bufLen = w*h*/;

    unsigned char* pYuvBuf = new unsigned char[bufLen];

    int iCount = ;  

    for(int i=; i<; i++)

    {

        fread(pYuvBuf, bufLen*sizeof(unsigned char), , pFileIn);  

        cv::Mat yuvImg;

        yuvImg.create(h*/, w, CV_8UC1);

        memcpy(yuvImg.data, pYuvBuf, bufLen*sizeof(unsigned char));

        cv::Mat rgbImg;

        cv::cvtColor(yuvImg, rgbImg, CV_YUV2BGR_I420);  

        cv::imshow("img", yuvImg);

        cv::waitKey();  

        printf("%d \n", iCount++);

    }  

    delete[] pYuvBuf;  

    fclose(pFileIn);

}