LOS ANGELES — More than 300 video game performers and Hollywood actors picketed in front of the Warner Bros. Studios building on Thursday to protest against what they call an unwillingness from top gaming companies to protect union voice actors and motion capture workers equally against the unregulated use of artificial intelligence. Standing before the crowd, Duncan Crabtree-Ireland, national executive director of the Screen Actors Guild-American Federation of Television and Radio Artists, said that AI has become the most challenging issue in many of the union’s negotiations. “We’ve made deals with the studios and streamers.