That is A LOT of entrance activity.
I would pay close attention to what's going. Does there seem to be any 'fighting' among the bees at the entrance?
Is there enough ventilation in the hive? Is there a top entrance as well? That is a very crowded entrance. This time of year it's normal to see a lot of coming and going but that looks to be too much congestion. You want to rule out robbing and then make sure the bees have plenty of room to come and go and plenty of ventilation to keep the hive cool.