Richard Pryor: Live in Concert (1979)

Richard Pryor: Live in Concert was the second of Richard Pryor's filmed concert performances, but the first to be released theatrically (Richard Pryor: Live & Smokin' was filmed in 1971, but not released until 1985 on VHS). It was produced and distributed independently and is the first full-length, feature movie consisting of only stand-up comedy often hailed as one of the seminal and most influential recorded stand-up performances of the modern era.

More at Wikipedia.