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procedure TMRMediaPlayer.SetPosition(FilterGraph: TFilterGraph; secPos: Cardinal);
var
  FMediaSeeking: IMediaSeeking;
  StopPosition, CurrentPosition: int64;
  MlsStopPos: Cardinal;
begin
  try
    FilterGraph.QueryInterface(IMediaSeeking, FMediaSeeking);
    FMediaSeeking.GetStopPosition(StopPosition);
    MlsStopPos := RefTimeToMiliSec(StopPosition);
    CurrentPosition := (StopPosition * secPos) div (MlsStopPos div 1000);
    StopPosition := 0;
    FMediaSeeking.SetPositions(CurrentPosition, AM_SEEKING_AbsolutePositioning, StopPosition, AM_SEEKING_NoPositioning);
  except
    Exit;
  end;    
end;