LOS ANGELES — The film that set off violence across North Africa was made in obscurity somewhere in the sprawl of Southern California, and promoted by a network of right-wing Christians with a history of animosity directed toward Muslims. When a 14-minute trailer of it — all that may actually exist — was posted on YouTube in June, it was barely noticed.

But when the video, with its almost comically amateurish production values, was translated into Arabic and reposted twice on YouTube in the days before Sept. 11, and promoted by leaders of the Coptic diaspora in the United States, it drew nearly one million views and set off bloody demonstrations.

The history of the film — who financed it; how it was made; and perhaps most important, how it was translated into Arabic and posted on YouTube to Muslim viewers — was shrouded Wednesday in tales of a secret Hollywood screening; a director who may or may not exist, and used a false name if he did; and actors who appeared, thanks to computer technology, to be traipsing through Middle Eastern cities. One of its main producers, Steve Klein, a Vietnam veteran whose son was severely wounded in Iraq, is notorious across California for his involvement with anti-Muslim actions, from the courts to schoolyards to a weekly show broadcast on Christian radio in the Middle East.

Yet as much of the world was denouncing the violence that had spread across the Middle East, Mr. Klein — an insurance salesman in Hemet, Calif., a small town two hours east of here — proclaimed the video a success at portraying what he has long argued was the infamy of the Muslim world, even as he chuckled at the film’s amateur production values.