FA-77889 / Subtitle cue timing / Member archive

SRT and WebVTT timestamp formatting: vtt short separator · case 04

Short WebVTT timestamps contain a comma and are rejected by players.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Format integer milliseconds as a cue timestamp. Negative values clamp to 0. style "srt" gives HH:MM:SS,mmm (hours at least two digits, never wrapped); style "vtt" gives MM:SS.mmm when the hour field is zero and HH:MM:SS.mmm otherwise.

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: vtt short separator	`"53:12,469"`	`"53:12.469"`	Failed

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