FA-78388 / Broadcast timecode arithmetic / Member archive

Frame count to timecode label with frame pairs: pair index · case 03

Frame-pair fields restart halfway through each second.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Convert a frame count (any integer, wrapped modulo 24 hours) to HH:MM:SS:FF. For fps above 30 the frame field counts frame pairs (frame//2) and the last separator is "." for the second frame of a pair and ":" otherwise.

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: pair index	`"01:00:00.07"`	`"01:00:00.03"`	Failed

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