You're a movie buff.

你是个电影迷。

www.fq51.cn

I didn't know you were such a movie buff.

我不知道你这么迷电影。

www.zzzpc.com

You ' re a big movie buff , right ? - yes.

你是个电影爱好者，对不对? -是的。

www.translation-dictionary.net

Mario Cortesi, a Swiss movie buff, has purchased several Oscars to add to his collection of film memorabilia.

FORBES: Psst! Wanna Buy An Oscar?

But only a movie buff with an encyclopedic memory could tell you which movie won the Oscar for Best Picture that year.

FORBES: Advertising's Triple Crown For The Second Screen

On a bus in Tehran, an unemployed movie buff reading a published screenplay passes himself off as its author, the internationally acclaimed filmmaker Mohsen Makhmalbaf.

NEWYORKER: Close-Up