FA-78243 / Subtitle cue timing / Member archive

Pop-on caption buffer timing: memory swap · case 03

Captions loaded after a flip repeat the previous caption text.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Commands [frame,cmd] at integer fps (time = frame*1000//fps). TEXT:x appends x to the non-displayed memory; ENM erases non-displayed memory; EOC swaps displayed and non-displayed memories; EDM erases displayed memory. Whenever non-empty displayed text is replaced (EOC) or erased (EDM), emit [shown_since_ms, now_ms, 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: memory swap	`[[1920, 1960, "Hi"], [1960, 4920, "Hi"], [4920, 5200, "HiHiBye"]]`	`[[1920, 1960, "Hi"], [4920, 5200, "HiHiBye"]]`	Failed

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