FA-78473 / Broadcast timecode arithmetic / Member archive

Field-wise non-drop timecode addition: frame remainder · case 03

PAL sums produce frame fields of 25 to 29.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Add two valid non-drop labels at integer fps field by field with carries (frames into seconds at fps, seconds into minutes at 60, minutes into hours at 60) and wrap hours modulo 24.

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 remainder	`"00:00:02:06"`	`"00:00:02:11"`	Failed

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