Yet it is not an overtly political film, instead meditating on shifting familial allegiances and the way space intersects with identity.
The protest was met by ecstatic applause inside the cinema.
Writer-director Kleber Mendonca Filho, along with his cast and crew, climbed the steps to the Palais in Cannes before revealing a selection of banners apparently objecting to the recent impeachment of president Dilma Rousseff.
The cast and crew of Aquarius, an acclaimed Brazilian drama in competition at Cannes have used the film’s official premiere to mount a protest as what they see as a coup in their country.