What do the Brazil protesters really want?

On Tuesday Brazil's President Dilma Roussef held her first meeting with members of the protest movement who started the demonstrations which then engulfed the country.

In the beginning it was all about bus fares in Sao Paulo. Somehow that exploded into catch-all riots in city after city, with political leaders struggling to work out what on Earth was going on.

BBC Newsnight's Tim Whewell is in Rio de Janeiro to find out what those who have taken to the streets in their hundreds of thousands really want.