Caption timing has several layers. A visible word can be wrong because of its token timestamp, page grouping, the caption layer’s composition placement, or the source clip’s own edit.
Time mapping
Page duration
Page duration (ms) sets the maximum grouping window. The control has a minimum of 200 ms and steps by 100 ms. Shorter values create more frequent page changes; longer values keep more words together until the duration threshold or other grouping conditions split them.
Maximum lines
Maximum lines constrains displayed height and influences text fitting/clamping after a page has been grouped. It does not repartition tokens into additional pages. A lower value can improve scanability but can also force tighter fitting or hide overflow. Box width, font size, letter spacing, and line height also affect the result.
Diagnose the symptom
Frame conversion
Token timestamps use milliseconds while playback uses frames. At fps:
Rounding means several millisecond values can map to the same frame. Judge the displayed frame boundary, not only the decimal timestamp.
Changing the source clip’s trim or playback rate after caption creation can invalidate alignment. Recheck or recreate the caption layer when the source time map changes materially.
