FA-78285 / Subtitle cue timing / Member archive

Recommended cue duration on frame grid: frame back-conversion · case 05

The reported millisecond duration is shorter than the frame count covers.

Member previewVariant 5 · 3 implementations · 9 checks per implementation

Case contract

rules [base,per_char,min,max]. Count characters other than spaces and line breaks; duration = base + count*per_char, clamped to [min,max]; then rounded up to whole frames at fps [N,D]. Return [frames, ceil(frames*1000*D/N)].

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: frame back-conversion	`[20, 834]`	`[20, 835]`	Failed

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