FA-77904 / Subtitle cue timing / Member archive

Partial subtitle resync from a point: negative start clamp · case 04

Cues that straddle zero after an early shift disappear entirely.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Cues [start,end,text] (sorted by start) whose start is at or after from_ms are shifted by offset ms (start and end). A cue whose end becomes <= 0 is dropped; a negative start is clamped to 0 without moving its end. The result is re-sorted by (start,end) and numbered from 1 as [n,start,end,text].

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: negative start clamp	`[[1, 0, 1500, "d"]]`	`[[1, 0, 1500, "d"], [2, 0, 2800, "b"]]`	Failed

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

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