Why is Indian epic 'RRR' such a global hit?

It's India's most expensive film ever - but 'RRR' has more than rewarded its makers with a worldwide box office so far of $US 175 million.

As well as becoming a fan favourite in India, 'RRR' ( which stands for 'Rise, Roar, Revolt') also been a hit as far afield as the USA and Japan.

Set a century ago and made in the Telegu language, the action epic is the fictitious story of two real-life revolutionaries who fight against British colonial rule in India.

Tom Brook and the BBC Talking Movies team spoke to director S.S Rajamouli about the secrets behind the film's success.