FA-78348 / Broadcast timecode arithmetic / Member archive

Non-drop timecode label parsing: hour field bound · case 03

Labels at hour 24 are accepted and alias the following day.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Parse a non-drop label HH:MM:SS:FF (exactly two digits per field, colons only) at integer fps to a frame count from midnight. Hours 0-23, minutes and seconds 0-59, frames below fps; anything else, including drop-frame separators, returns None.

Why this case matters

Timecode arithmetic errors misplace edits, commercial breaks and captions against the broadcast clock.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: hour field bound	`2699994`	`null`	Failed

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