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procedure TForm1.btnRenderFileClick(Sender: TObject); 
var 
  pGraph: IGraphBuilder; 
  pControl: IMediaControl; 
  pEvent: IMediaEvent; 
  evCode: Integer; 
  strPath: string; 
  wstrFileName: PWideChar; 
begin 
  CoInitialize(nil); 
  GetMem(wstrFileName, MAX_PATH); 
  try 
    CoCreateInstance(CLSID_FilterGraph, nil, CLSCTX_INPROC_SERVER,IID_IGraphBuilder,pGraph); 
    pGraph.QueryInterface(IID_IMediaControl,pControl); 
    pGraph.QueryInterface(IID_IMediaEvent,pEvent); 
    {-----} 
    strPath := FilenameEdit1.Text; 
    MultiByteToWideChar(CP_ACP, 0, PChar(strPath), -1, wstrFileName, MAX_PATH); 
    if Succeeded(pGraph.RenderFile(wstrFileName,nil)) then 
    {-----} 
    begin 
      if Succeeded(pControl.Run) then begin 
        pEvent.WaitForCompletion(INFINITE,evCode); 
      end; 
    end; 
  finally 
    CoUninitialize(); 
    FreeMem(wstrFileName, MAX_PATH) 
  end; 
end;