FA-78363 / Broadcast timecode arithmetic / Member archive

Non-drop timecode label parsing: separator policy · case 03

Drop-frame labels are silently parsed as non-drop counts, shifting events by up to 108 frames per hour.

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: separator policy	`1416`	`null`	Failed

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