Mircale occurs at the 28 second mark
On November 7, 1999 a solemn Mass was held in the minor Basilica of Lourdes. The Archbishop of Lyon at the time, the late Cardinal Billé, was the celebrant and concelebrating with him were the archbishop of France, Cardinal Jean-Marie Lustiger, a number of French bishops, a number of priests and all the superiors of Trappist monasteries worldwide. The ceremony was broadcast live on French television. On the altar were two hosts to be consecrated, much larger than those used by Italian priests, as is customary in France. At the beginning of the Mass, the two hosts appear in the film to be stacked one above the other, so that one cannot tell that their are two instead of one: they are resting on the paten, a type of tray, and are perfectly matched up.
The film shows various camera angles showing them in this position and there is no doubt that the two hosts are physically stacked one atop the other and resting on the paten. At the moment of the “epiclesis”, that is, when the priest extends his hands and invokes the Holy Spirit, the phenomenon is evident.