FA-78219 / Subtitle cue timing / Member archive

Karaoke syllable timing: karaoke tag family · case 04

Sweep-fill and outline karaoke syllables vanish and later syllables start early.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Karaoke text is a sequence of {\k|\K|\kf|\ko<cs>}syllable with durations in centiseconds. Syllable i starts at cue start plus the sum of all previous durations (empty syllables still consume time). Syllables starting at or after the cue end are dropped; others are clipped to the cue end. Output [syllable,start_ms,end_ms].

Why this case matters

Subtitle timing defects shift, hide or overlap captions that viewers depend on for comprehension and accessibility.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: karaoke tag family	`[["la", 0, 250], ["Hel", 250, 250]]`	`[["la", 0, 250], ["Hel", 250, 500], ["Hel", 500, 500]]`	Failed

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