FA-78698 / Broadcast timecode arithmetic / Member archive

Frame-rate descriptor parsing: non-drop suffix · case 03

Explicit NDF descriptors are treated as drop frame.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Parse a rate descriptor: a known rate (23.976, 23.98, 24, 25, 29.97, 30, 50, 59.94, 60; redundant trailing decimal zeros allowed) with an optional case-insensitive DF/NDF suffix, optionally separated by a space or hyphen; surrounding whitespace ignored. Drop frame is only valid for 29.97 and 59.94. Return [num,den,drop] or 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: non-drop suffix	`[30000, 1001, true]`	`[30000, 1001, false]`	Failed

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