FA-78070 / Subtitle cue timing / Member archive

Two-point subtitle synchronisation: slope orientation · case 05

Subtitles drift in the wrong direction the further they are from the first anchor.

Member previewVariant 5 · 3 implementations · 8 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: slope orientation	`[[10554, 10558]]`	`[[0, 1], [3389, 3390], [250, 500]]`	Failed

MEMBER ARCHIVE

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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