影迷(yǐng mí) - film fan, movie fan in Mandarin

影迷 (yǐng mí) means film fan or movie buff, short for 电影迷 (diàn yǐng mí). 影 (yǐng) is the same 影 found in 电影 (diàn yǐng), film, literally "electric shadow", and 迷 (mí) means fan, enthusiast, or to be captivated by something.

迷 (mí) is a productive suffix: swap the first half and you get 歌迷 (gē mí), music fan, or 球迷 (qiú mí), sports fan, literally "ball fan", the same job English gives "-head" or "buff".

影迷 (yǐng mí) usually describes a fan of cinema in general rather than one actor, though 忠实影迷 (zhōng shí yǐng mí), "loyal fan", can narrow the focus to a particular star or director when the context makes that clear.