problem loading avi file with cvcamPlayAVI

 hi
  i'm new to opencv.  
  i installed opencv  and viewed the examples and tried some coding... 
everything was fine and perfectly working. 
  so i tried to open an avi movie with 
  
  void ShowAVIVideo(char* filename, HWND hwnd, int width, int height)
  {
      cvcamAVIFILE f = cvcamAVIOpenFile(filename);
      if( (int)f < 0 )
          return;
      cvcamAVISetWindow (f, hwnd);
      cvcamAVISetCallback(f, mycallback);
      cvcamAVISetSize(f, width, height);
      cvcamAVIRun(f);
      cvcamAVIWaitCompletion(f);
      cvcamAVIStop(f);
      cvcamAVICloseFile(f);
  }
  
  cvNamedWindow("avi window", CV_WINDOW_AUTOSIZE);
   ShowAVIVideo( movie, (HWND)cvGetWindowHandle("avi window"), 320, 240);
  
  the window was opened but it was only grey and i didn't receive an error 
message neither the movie was shown in the window.
  
  so i tried simple to call
  
  cvcamPlayAVI(0,0,0,0,0)
  
  the file dialog was opened and i was able to choose an avi file of my  
choice. so i have chosen an avi file, but again the opened window  stayed grey 
and didn't show the avi file 
  
  who one can help? i have no idea about the error.
  
  thanx
  
  

                
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