Cops in North Carolina can apparently beat the crap out of a suspect on video and go to work like nothing happened ... because that's what is playing out right now in Greensboro.

Folks are outraged over a clip that's going viral ... it shows at least three officers using force on a Black man they have pinned to the ground, and it looks like one cop has a knee near the man's neck.

A Greensboro Police Department spokesperson tells TMZ ... the officers in the video remain on active duty.

The video shows one officer raining blows down on the subject ... though cops say he's punching the man's back shoulder area to get him to release an arm.

Greensboro PD says the video shows an arrest they made this past Sunday night ... cops say they were on a proactive patrol when they spotted the man in

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