Why Hollywood is missing from Cannes this year

The Cannes Film Festival, one of the biggest annual events in the world of cinema, has got underway in the South of France. Despite big names expected to attend the 12-day festival, including Julianne Moore, Kristen Stewart, John Travolta and Peter Jackson, no major US blockbuster picture is being launched at Cannes this year. From the French Riviera, BBC talking Movies' Tom Brook explains why.