"I'm Still Here" will be released September 10, 2010.
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The official synopsis :
The directorial debut of Oscar-nominated actor Casey Affleck, I’M STILL HERE is a striking portrayal of a tumultuous year in the life of internationally acclaimed actor Joaquin Phoenix. With remarkable access, I’M STILL HERE 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. Sometimes funny, sometimes shocking, and always riveting, the film is a portrait of an artist at a crossroads. Defying expectations, it deftly explores notions of courage and creative reinvention, as well as the ramifications of a life spent in the public eye.
+ Phoenix is filmed while snorting coke off a prostitute's breast.
More info here