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TMZ Sports has obtained video from the violent altercation in Pittsburgh involving Darrelle Revis -- in which you can hear a man bragging about knocking two guys out cold.

The identity of the man doing the bragging is unclear -- and Revis has denied wrongdoing -- but Revis is the only person charged with a crime in this case ... so it appears officials believe the voice is Darrelle.

We spoke with a rep for the Pittsburgh Police Dept. who confirms the video is from the Feb. 12th incident involving the NFL star.

According to the criminal complained filed against Revis, a witness told cops Revis was allegedly screaming, "Do you want to be next?"

In the video, you can hear someone saying, "Shut up before I knock your ass out next."

Revis was arrested on multiple felony criminal charges including robbery, assault and conspiracy.