Exclusive | Inside Whitney Houstons best show at landmark South Africa concert 30 years ago: She was hysterically funny and confident

In 1994, there was no doubt about who had the greatest voice of all: Whitney Houston.So if there was going to be one singer on earth to capture a historic moment in time, it was going to be the “I Will Always Love You” diva.And so Houston was the first major Western artist to perform in a post-apartheid South Africa after Nelson Mandela was elected president in 1994, with three shows in Durban, Johannesburg and Cape Town.But while the Johannesburg show on Nov.12, 1994 was the one aired by HBO, the Nov.

8 Durban date is now showcased in “The Concert for a New South Africa [Durban],” a film that will be playing in select theaters on Oct.23 and 27 before the live album is released on Nov.

8.It’s a rousing rewind back to the prime of Houston’s career — 18 years before her death in 2012 at age 48.“She was at the peak of her powers,” producer and director Marty Callner told The Post.“Nobody had her pipes.

And that night, she hit everything.She was absolutely perfect — no cracks in the voice, no straining, no working around the high notes, none of that.

She just hit it.”Indeed, Houston’s longtime musical director Rickey Minor also saw — and heard — something special in her that night.“Her vocals were probably the best vocals I’ve heard in my life on this show, because of her command of everything,” he said.“She sang anything she wanted to sing.

She didn’t hold back anything.Everything was up for grabs … She just, you know, ate it up.”Minor was no stranger to the pop superstar’s live gifts, as he previously worked with her for her iconic rendition of “The Star-Spangled Banner” at the 1991 Super Bowl, the “Welcome Home Heroes with Whitney Houston” HBO concert special later that year and the “I’m Your Baby Tonight” and “The Bodyguard” tours.“But I’m telling you, on this one in particular, her vocals were stellar,” he said.

“I mean, she could sing ‘Mary Had a Little Lamb’ and someone would start ...