Joaquin Phoenix doc finds distributor

Casey Affleck's 'mockumentary' about Joaquin Phoenix has been picked up by Magnolia Pictures.

I'm Still Here: The Lost Year Of Joaquin Phoenix follows the Walk The Line star's 'retirement' from acting and subsequent attempt to launch a hip-hop career.

Now Magnolia Pictures, after recently entering into talks to acquire the project, has announced that the film will have a platform release on September 10, with a wider release expected the following week.

Deadline also reports that the studio is considering giving the film its premiere at either the Venice or Toronto film festival.

Magnolia president Eamonn Bowles called the film "a pretty amazing piece of work, jaw-dropping but dimensional".

He added: "It is going to get a lot of attention, but it is not some cheap stunt where they said, 'Let's do some wild stuff and film it.' It is extreme behaviour but really good filmmaking as well. Frankly, some of the behaviour is very extreme.

"But it is in the context of the insanity of being in Joaquin's life for that period of time. It is a unique piece of work that is going to surprise people in different ways."

Director Affleck recently admitted that he "lucked out" with the documentary.