FA-78072 / Subtitle cue timing / Member archive

Two-point subtitle synchronisation: intercept anchor · case 02

Mapped cues are offset by a constant error unless the first anchor sits at time zero.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

anchors [[a1,b1],[a2,b2]] (a1 != a2, b1 != b2) map subtitle time a to video time b linearly through both points. Each time is mapped exactly, rounded half up, clamped at 0; cues whose mapped end is not after the mapped start are dropped.

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: intercept anchor	`[[2000, 2001], [2000, 2500], [5389, 5639]]`	`[[1500, 1501], [1500, 2000], [4889, 5139]]`	Failed

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