Subtitling a film like "Jab Tak Hai Jaan" is a complex process that requires a deep understanding of the original content, cultural nuances, and linguistic expertise. The process involves translating the dialogue, songs, and background conversations into the target language while ensuring that the subtitles are synchronized with the film's audio and video. Moreover, subtitling requires a keen eye for detail to capture the essence of the original content, including idioms, colloquialisms, and humor.