I do think when you select just best so you specify an output format youtube sends the format it thinks is the best movie+audio combo for that structure. This is likely to be topic to some youtube inner balancing decisions (speculation). אפילו יש הטוענים, שההצפנה מקצה לקצה ביישומון וואטסאפ היא https://officialwholemeltextractsshop.com/