In a world where women work as police, firefighters, fighter pilots, surgeons and engineers, the vast majority of movie trailers are still voiced by men.

Industry insiders cite a perception that men's voices are more authoritative and have a broader appeal to audience members. Action-and-adventure movies, they say, require the gravitas brought by male actors. And for the most part, even female-focused movies employ male voices in the trailer.

That attitude is changing. A small group of female voiceover artists are starting to find work on trailers. They predict that as the audience is exposed to women's voices, the stereotypes will fade.

Tom Brook reports from Los Angeles.