Shia LaBeouf apparently messed with the wrong people in New Orleans … we have video of the actor getting the ever-living hell beat out of him before cops arrived at the scene.

Watch the video … while Shia struggles to get back to his feet — apparently already having been knocked to the ground — a man warns him to stay down as he delivers 2 huge blows to Shia’s face.

“We gon’ beat the f*** out you, boy. Chill!” the man yells.

As we reported … Shia was taken to a hospital to be treated for unknown injuries and later arrested and charged with 2 counts of simple battery.