CaptionPass
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Fix overlapping subtitles

Overlapping cues mean two captions are visible on screen at the same time according to their timestamps. The format does not forbid it, but most viewers see this as flickering, skipped lines, or one cue replacing the other mid-word.

Why it happens

  • An auto-generated VTT track from a video host that didn't deduplicate.
  • A manual edit that bumped one cue's end time past the next start time.
  • A merge of two caption tracks (translation + transcription) into one file.

How to fix it

The safe fix is to trim the earlier cue's end time so it stops just before the next cue begins, leaving a small gap (we use 40–80ms by preset). CaptionPass does this automatically and lists every adjustment in the validation report.

Run your caption file through the “Generic safe” preset to get a clean, non-overlapping copy.