Subtitle Parser Passes Error Checks Yet Captions Remain Hard to Read

A developer building the SubtitlePop caption tool found that a subtitle file parsed with zero errors still produced hard-to-read captions. The sample had overlapping cues, a caption displayed for only 0.6 seconds that holds 61 characters, and a line exceeding the configured length limit. The author published an open-source companion tool, subtitle-timing-kit, that flags such timing problems as warnings rather than errors. The tool's reading-speed and line-length thresholds are adjustable review aids, not accessibility certifications. The post also notes that overlapping cues can be legitimate, so flagging them is not the same as rejecting them.