Chris Brown: Video of ATV Antics ... Police on the Case

Chris Brown's ATV antics have been captured on video ... which is now in the hands of the LAPD.

The video -- shot by one of Brown's San Fernando Valley neighbors and obtained by TMZ -- shows Brown and a friend, each on an ATV, and another friend on a 3-wheeler, driving at a high rate of speed in the neighborhood.

As we reported, some of Chris' neighbors are enraged he's been driving recklessly in the neighborhood. They say Brown was doing doughnuts on the street last Wednesday, even on someone's lawn. Brown denies it, but this video was shot the next day.

The video has been turned over to the LAPD, which has already told us will be sent over to the L.A. City Attorney for possible criminal prosecution for disturbing the peace.

Chris believes the neighbor who shot the video is just angry because he's "rich and black."

BTW ... driving an ATV on a public street is illegal.