We have got their hands on the first teaser trailer for I’m Still Here, a film documenting a year in the life of Joaquin Phoenix (Walk the Line, Two Lovers).

I’m Still Here was directed by Casey Affleck (Gone Baby Gone, The Killer Inside Me), making this his directorial debut.

Synopsis: I’m Still Here is a portrayal of a tumultuous year in the life of actor Joaquin Phoenix. With remarkable access, the documentary follows the Oscar-nominee as he announces his retirement from a successful film career in the fall of 2008 and sets off to reinvent himself as a hip hop musician. The film is a portrait of an artist at a crossroads and explores notions of courage and creative reinvention, as well as the ramifications of a life spent in the public eye.

Check out the trailer below, which gives a brief insight into the bizarre documentary (or mockumentary):

It was recently announced that Magnolia Pictures had acquired the distribution rights, with a US release scheduled for September 10, 2010.