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  var qtxt, link:String;
  var i:Integer;
  var t:String;
  var tfs:TFileStream;
begin
  link:='oOeugwd4vqs';

  qtxt:=IdHTTP1.Get('http://www.youtube.com/watch?v='+link);

  t:=abschneiden('"t": "', qtxt);

  //normale Qualität
  tfs:=TFileStream.Create('temp.flv',fmOpenWrite or fmShareDenyNone);
  IdHTTP1.Get('http://www.youtube.com/get_video?video_id='+link+'&t='+t,tfs);
  tfs.Free;
           
  //hohe Qualität
  tfs:=TFileStream.Create('temp.mp4',fmCreate or fmShareDenyWrite);
  IdHTTP1.Get('http://www.youtube.com/get_video?video_id='+link+'&t='+t+'&fmt=18',tfs);
  tfs.Free;  
end;