FA-78214 / Subtitle cue timing / Member archive

Timed-text time expression evaluation: clock rounding · case 04

Clock times with half-millisecond frames end up one millisecond early.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Evaluate a timed-text time expression to integer ms, rounded half up. Offset form <number><metric> with metric h, m, s, ms, f (frames at frame_rate) or t (ticks at tick_rate). Clock form HH:MM:SS with optional .fraction (any digits) or :FF frames (FF < frame_rate). Minutes/seconds above 59 or malformed text give None.

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: clock rounding	`1800041`	`1800042`	Failed

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