Beautiful snakes. I'm in the "snake lover" category myself. I think your black one is an eastern king (for 2 reasons). The color pattern (the single yellow line and the multi colored belly). I think a rat snake has more color on his back and a plain white belly. But hard to tell sometimes.
The King snake is named that because he is the "KING OF SNAKES". He eats other snakes, including venomous ones. They are my absolute favorite snake to see. And they are smart. If approached by a predator, a King snake will run his tail under a pile of leaves/twigs and shake it, trying to make a rattlesnake noise. He thinks he can fool his predator by doing this. Who knows; maybe it works.
Anyway, lovely snakes and lovely video. And hey, even if that smaller one is not venomous, let that king snake eat! You want him to stick around.
Indeed a King Snake. I've also seen a Copperhead rustle leaves with its tail to mimic a Rattlesnake.
OP, the bands on a Copperhead will look more hourglass shaped than straight bars or bands, usually a few broken bands toward the rear section of the body.