FA-78810 / Broadcast timecode arithmetic / Member archive

Chase-lock offset with subframes: subframe digits · case 05

A label ending in .5 contributes 5 hundredths instead of 50.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Labels HH:MM:SS:FF.s where s is one or two digits of hundredths of a frame (".5" means 50). Return the offset from a to b as [frames, subframes] along the shorter way round 24 hours (exactly 12 hours is positive), with both components carrying the sign and 0 <= |subframes| < 100.

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: subframe digits	`[-52230, 0]`	`[-52230, -45]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.