Watch out, YouTube – another Gavin Newsom video is coming your way.

But don’t worry, this one won’t take 7½ hours to watch in full.

The mayor’s gubernatorial campaign is about to debut a flashy new spot on YouTube and its Web site that will last a swift 60 seconds, said campaign manager Nick Clemons.

The gist of the clip: “It’s basically a call for a constitutional convention to fix the broken system in Sacramento,” Clemons said. “We’re talking about starting from scratch.”

It will be the first in a series of TV-like campaign spots, Clemons said.

The video will be released later this morning, he said.