The film, which Oprah co-produced under Harpo Productions alongside Brad Pitt's Plan B Entertainment, is a historical period piece with a massive ensemble cast, but had a limited budget - which has been estimated at around $20 million. It was a challenge that few directors wanted to take on, except for indie director Ava DuVernay.
"When [Ava DuVernay] looked at this budget, she said she could make it happen, and tonight I saw it in a way I hadn't seen it before," said Oprah, who began to get emotional thinking about the film's production and possible future impact. "I'm just proud of her and I'm proud of what we were able to do with the film."
Selma tells the story of Martin Luther King, Jr. leading the fight for civil rights in the face of violent and aggressive racism, and the historic march from Selma to Montgomery which led to the passing of the civil rights movement.
In the film, Oprah plays civil rights activist Annie Lee Cooper, who was famously provoked and attacked by Dallas police in 1962 before joining King on the famous march in 1965.
Check out the video for more from Oprah Winfrey on the film's challenging production.
Selma is set for limited release on Dec. 25, 2014, and opens wide Jan. 9, 2015.