FA-78397 / Broadcast timecode arithmetic / Member archive

Drop-frame 29.97 label to frame count: frame field range · case 02

A label with frame 30 is accepted and aliases the next second.

Member previewVariant 2 · 3 implementations · 9 checks per implementation

Case contract

Parse HH:MM:SS;FF drop-frame 29.97 labels (the last separator may be ";", "," or "."). Labels ;00 and ;01 at second 00 of minutes not divisible by 10 do not exist and return None, as do out-of-range fields (hours 0-23, frames 0-29). Frame count = nominal 30 fps count minus 2 per elapsed minute except every tenth minute.

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 range	`127732`	`null`	Failed

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