FA-78434 / Broadcast timecode arithmetic / Member archive

Frame count to drop-frame 29.97 label: minute field · case 04

Minute fields jump ahead late in the hour.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Convert a non-negative frame count (negative counts return None; counts wrap to the 2589408-frame drop-frame day) to an HH:MM:SS;FF 29.97 drop-frame label: 18 labels are skipped per 10-minute block of 17982 frames, and labels ;00/;01 are skipped at each minute not divisible by ten.

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: minute field	`"07:16:35;17"`	`"07:15:35;17"`	Failed

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