运行到AVIStreamWrite有问题

void CTestDlg::BMPtoAVI(CString szAVIName, CString strBmpDir)
{
       CFileFind finder;
       strBmpDir += _T("//*.*");
       AVIFileInit();  
       AVISTREAMINFO strhdr;
       PAVIFILE pfile;
       PAVISTREAM ps;
       int nFrames =0;
       HRESULT hr;
 
       BOOL bFind = finder.FindFile(strBmpDir);
       while(bFind)
       {
              bFind = finder.FindNextFile();
              if(!finder.IsDots() && !finder.IsDirectory())
              {
                     CString str = finder.GetFilePath();
                     FILE *fp = fopen(str,"rb");
                     BITMAPFILEHEADER bmpFileHdr;
                     BITMAPINFOHEADER bmpInfoHdr;
                     fseek( fp,0,SEEK_SET);
                     fread(&bmpFileHdr,sizeof(BITMAPFILEHEADER),1, fp);
                     fread(&bmpInfoHdr,sizeof(BITMAPINFOHEADER),1, fp);
 
                     BYTE *tmp_buf = NULL;
                     if(nFrames ==0 )
                     {
                           AVIFileOpen(&pfile,szAVIName,OF_WRITE | OF_CREATE,NULL);
                            memset(&strhdr, 0, sizeof(strhdr));
                            strhdr.fccType                = streamtypeVIDEO;// stream type
                            strhdr.fccHandler             = 0;
                            strhdr.dwScale                = 1;
                            strhdr.dwRate                 = 15;                 // 15 fps
                            strhdr.dwSuggestedBufferSize = bmpInfoHdr.biSizeImage ;
                            SetRect(&strhdr.rcFrame, 0, 0, bmpInfoHdr.biWidth, bmpInfoHdr.biHeight);
 
                            // And create the stream;
                            hr = AVIFileCreateStream(pfile,&ps,&strhdr);        
               // hr = AVIStreamSetFormat(ps,nFrames,&bmpInfoHdr,sizeof(bmpInfoHdr));
                    }
                     tmp_buf = new BYTE[bmpInfoHdr.biWidth * bmpInfoHdr.biHeight * 3];
                   fread(tmp_buf, 1, bmpInfoHdr.biWidth * bmpInfoHdr.biHeight * 3, fp);
                     hr = AVIStreamSetFormat(ps,nFrames,&bmpInfoHdr,sizeof(bmpInfoHdr));
                     hr = AVIStreamWrite(ps,       // stream pointer
                              nFrames,                          // time of this frame
                                   1,                         // number to write
                                   (LPBYTE) tmp_buf,
                                   bmpInfoHdr.biSizeImage , // size of this frame
                                   AVIIF_KEYFRAME,                    // flags....
                                   NULL,
                                   NULL);
 
                     nFrames ++;
                     fclose(fp);
 
              }
       }
 
       AVIStreamClose(ps);
 
      if(pfile != NULL)
      AVIFileRelease(pfile);
 
       AVIFileExit();
}我动态库也有。
问题如下：
我运行了regsvr32 avifil32.dll
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