Roman Polanski's new film "An Officer and a Spy," a portrayal of the notorious Dreyfus Affair in 19th Century France, premieres at the Venice Film Festival on Friday to renewed controversy over the director, given his conviction for a sex crime.

Polanski has sought to compare his own situation with that of Alfred Dreyfus, a Jewish artillery officer in the French army who in 1894 was convicted of treason and shipped to the Devil's Island penal colony off South America's Atlantic coast.

Dreyfus' conviction was criticized as being motivated by anti-Semitism and the case deeply split France. He was eventually exonerated.

Polanski, who fled the United States after pleading guilty in 1977 to having unlawful sex with a 13-year-old girl in Los Angeles, said in production notes he was "familiar with many of the workings of the apparatus of persecution shown in the film, and that has clearly inspired me."

The French-Polish director did not attend the Venice festival, where the French-language film is one of 21 in competition for the Golden Lion prize. It is being presented by cast members, including Polanski's wife Emmanuelle Seigner, and producers.

Festival organizers have faced criticism for including it in the program but have defended the move by saying it is the film and not the man being judged.

At the start of a news conference, where Seigner, actors Jean Dujardin and Louis Garrel were applauded on arrival, producer Luca Barbareschi said only questions about the movie would be answered.

"This is not a moral tribunal," he said. "The past is in the past, we need to focus on the present. The film must speak for itself, the jury must judge and the public, if they want, can applaud."

After his conviction, Polanski fled the United States for fear a deal for leniency with prosecutors would be overruled and he would get a lengthy prison term. Now aged 86, he lives in Europe.

His history came under renewed scrutiny as the Me Too movement against sexual abuse and harassment grew in the wake of allegations against Hollywood mogul Harvey Weinstein in 2017.

Last year, he was expelled from the Academy of Motion Picture Arts and Sciences.