Ahead of the festival, organizers announced that next year, streaming-only films will not be selected in Cannes' competition lineup - a move applauded by French theaters and decried by Netflix.
The Cannes Film Festival runs through May 28, when the Palme d'Or victor and other awards will be announced.
At this year's festival Getty Images photographers will shoot over 500,000 images, ensuring every moment on and off the red carpet is captured.
"It would be an enormous paradox if the Palme d'Or went to a film that can not be seen in cinemas", he said in the jury's first press conference.
"What I hope is that we'll all feel the real emotion experienced by the first people to watch Viridinia, La Dolce Vita or Apocalypse Now", he said, naming the Palme d'Or winners from 1961, 1960 and 1979.
Spanish director and President of the Feature Film Jury Pedro Almodovar poses as he arrives on May 17, 2017 for the screening of the film "Ismael's Ghosts" (Les Fantomes d'Ismael) during the opening ceremony of the 70th edition of the Cannes Film Festival. Farhadi's presence in Cannes sharply contrasted with February's Academy Awards ceremony, which the filmmaker (whose "The Salesman" won best foreign language film) boycotted to protest President Donald Trump's proposed travel ban on visitors from several predominantly Muslim nations.
"I prefer absolutely to be seen in not only 190 countries, but always to be seen on a big screen", Almodóvar said to scattered applause from the press.
The Cannes Film Festival is famous for its spirited arguments.
"They go to the movie theater to be humbled in front of certain images and there's other films that they prefer to watch at home and there's really little to no cross".
Others in the running for top honours include "Happy End", another film set against the backdrop of the migrant crisis by "Amour" director Michael Haneke, who is seeking a record-breaking third Palme d'Or. He said younger generations in particular were losing touch with "the capacity of hypnosis of a large screen for a viewer". "It's two completely different forms of entertainment".
Bong Joon-ho's Okja and Noah Baumbach's The Meyerowitz Stories are up for the prize, but critics have hit out at their inclusion and a new rule has been introduced for next year requiring films to have had theatrical distribution in French cinemas. "In my home, Netflix has been nothing but an absolute benefit". He clearly didn't forget to pack his movie star charm, showing up to a series of events to kick off the film festival and winning over press, cinephiles and adoring fans everywhere he went.
Netflix allows Smith's children to "watch films they otherwise wouldn't have seen". Netflix brings a great connectivity for them to the world. "Netflix has done nothing but broaden my children's global cinematic comprehension". And now they get to find those artists and they look them up online and they make contact.