Q1: Why do subtitles frequently differ from the exact words actors speak on screen?
A1: Subtitle creators follow strict constraints to keep reading speeds between 15 and 20 characters per second, meaning long-winded dialogue must be thoughtfully condensed so viewers have time to watch the actors' faces. However, automated transcription engines often alter phrasing incorrectly because they mishear words, invent synthetic phrases, or attempt unnatural edits that disregard the performer's actual rhythm.
Q2: What is machine translation post-editing, and why does it cause so many errors?
A2: Machine translation post-editing (MTPE) is a cost-cutting process where automated software generates an initial translation of a screenplay, which is then passed to a human editor who is paid low piece-rates to clean up obvious mistakes. Because editors are pressured to process thousands of words per hour to earn a livable wage, they lack the time to verify context, double-check idioms, or sync text to scene changes.
Q3: Why do streaming subtitles frequently drift out of sync with the video?
A3: Subtitle timing requires human verification to match speech bursts and camera cuts. When automated systems generate time codes based on algorithmic sound detection, soft voices, background music, or dynamic audio mixes can fool the detector. If an automated file is converted across different frame rates, such as converting 23.976 fps film to 25 fps broadcast streams, without manual review, the text will drift out of sync over time.
