C 程序单步调试问题

为何 mingw 跨平台编译 linux 原生 C 代码程序进行单步调试输出结果完全跟直接执行完全不同？调用了一个外部 dll 的 openh264.dll ，执行后无数据输出，dbg 单步调试不过，哪位高人帮忙改下代码，非软件专业实在感觉编写吃力

#include<stdio.h>
#include<stdlib.h>
#include<stdint.h>
#include<string.h>
#include<wels/codec_api.h>
int WinMain(){
    int width=176;
    int height=144;
    int inputwidth=width;
    int inputheight=height;
    size_t yuvsize=inputwidth*inputheight*3/2;
    FILE*FSoucre=fopen("source.yuv","rb");
    FILE*FSink=fopen("output.264","wb");
    ISVCEncoder*pEncoder=NULL;
    SEncParamBase param;
    SFrameBSInfo info;
    SSourcePicture pic;
    int i=0;
    int ret=0;
    char*buffer=(char*)malloc(yuvsize);
    memset (&param, 0, sizeof (SEncParamBase));
    memset (&info, 0, sizeof (SFrameBSInfo));
    memset (&pic, 0, sizeof (SSourcePicture));
    ret=WelsCreateSVCEncoder(&pEncoder);
    printf("WelsCreateSVCEncoder:%d\n",ret);
    param.iPicHeight=inputheight;
    param.iPicWidth=inputwidth;
    param.fMaxFrameRate=25;
    param.iUsageType=CAMERA_VIDEO_REAL_TIME;
    param.iTargetBitrate = 1000000;
    ret=(*pEncoder)->Initialize(pEncoder,&param);
    printf("Initialize:%d\n",ret);
do{
    int videoFormat = videoFormatI420;
    (*pEncoder)->SetOption (pEncoder,ENCODER_OPTION_DATAFORMAT, &videoFormat);
}while(0);
    pic.iPicWidth = width;
    pic.iPicHeight = height;
    pic.iColorFormat = videoFormatI420;
    pic.iStride[0] = pic.iPicWidth;
    pic.iStride[1] = pic.iStride[2] = pic.iPicWidth >> 1;
    pic.pData[0] = buffer;
    pic.pData[1] = pic.pData[0] + width * height;
    pic.pData[2] = pic.pData[1] + (width * height >> 2);
while(fread(buffer,1,yuvsize,FSoucre)==yuvsize){
    pic.uiTimeStamp=40*i;
    i++;
    (*pEncoder)->EncodeFrame (pEncoder,&pic, &info);
    if (info.eFrameType != videoFrameTypeSkip) {
        //output bitstream
          int iLayerNum=0;
          while(iLayerNum<info.iLayerNum){
            int iNalCount=0;
            int pos=0;
            while (iNalCount<info.sLayerInfo[iLayerNum].iNalCount){
#if 0
              printf("I:%d LayerNum:%d(%d) Size:%d Type:%d NalCount:%d(%d) NalSize:%d\n",i,
              iLayerNum,info.iLayerNum,info.iFrameSizeInBytes,
              info.sLayerInfo[iLayerNum].eFrameType,
              iNalCount,info.sLayerInfo[iLayerNum].iNalCount,info.sLayerInfo[iLayerNum].pNalLengthInByte[iNalCount]);
#endif            
              fwrite(info.sLayerInfo[iLayerNum].pBsBuf+pos,1,info.sLayerInfo[iLayerNum].pNalLengthInByte[iNalCount],FSink);
              pos+=info.sLayerInfo[iLayerNum].pNalLengthInByte[iNalCount];
              iNalCount++;
            }
            iLayerNum++;
          }
    }
}
    (*pEncoder)->Uninitialize(pEncoder);
    WelsDestroySVCEncoder(pEncoder);
    fclose(FSoucre);
    fclose(FSink);
return 0;
}