MIXED MEDIA : *** “BOBBY BROWN: HIS PREROGATIVE” Bobby Brown <i> MCA Music Video videocassette ($19.95)</i>

During one of the engaging, somewhat revealing interview segments scattered throughout this one-hour collection of videos, Brown makes a startling comment. He claims--with the utmost sincerity--that he’s not a good dancer. Boy, is he wrong. Now if he’d said he’s just a so-so singer, there wouldn’t be much argument. These videos confirm the notion that Brown’s dancing is his real strength--along with that brash charisma that wows female fans. “Every Little Step” and the two versions of “My Prerogative” are the most riveting of the eight videos, which are fairly straight-ahead and not particularly imaginative. Still, they’re all brimming with energy--from the charge generated by Brown’s performances.