Sound plays a big role in some of this year’s Oscar-nominated films, from the Andes to Auschwitz

In the film business, they say the prettiest film in the world will flop without great sound. This year there’s lots of audio to go around. From Society of the Snow’s use of wind, snow and silence, to The Zone of Interest’s “sound portrait” of the atrocities at the Auschwitz concentration camp, stories are reaching audiences as much through their ears as their eyes. The World’s Gerry Hadden reports from Barcelona.