FA-78787 / Broadcast timecode arithmetic / Member archive

Operator timecode entry normalization: frame field carry · case 02

An entry of 99 frames shows frame field 99.

Member previewVariant 2 · 3 implementations · 9 checks per implementation

Case contract

Normalize typed timecode. Separators ":", ";" and "." are equivalent. With separators, up to four numeric fields fill from the right (frames last). Without separators, up to eight digits are right-aligned into HH MM SS FF pairs. Field overflow carries through the total frame count, which wraps at 24 hours. Invalid entry 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: frame field carry	`"00:01:03:99"`	`"00:01:03:03"`	Failed

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