Semiotic film theory analyzes how meaning is conveyed through signs and codes in cinema. Films use various visual elements like lighting, shot composition, and juxtaposition of images to signify ideas beyond their literal meaning. Structuralist film theory emphasizes how simple combinations of shots can create additional implied meanings through cultural codes and conventions. Semiotic analysis involves examining signs like characters, props, and backgrounds to understand their denotations and cultural connotations, and how they relate through paradigmatic and syntagmatic relationships to construct meaning.