FA-78629 / Broadcast timecode arithmetic / Member archive

Linear timecode BCD field packing: color flag bit · case 04

Color-framed non-drop timecode is announced as drop frame.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Pack HH:MM:SS:FF into four bytes [frames, seconds, minutes, hours] in transmission order. Each byte holds units in bits 0-3 and tens from bit 4 upward. The frames byte carries the drop-frame flag (bit 6, set when the last separator is ";") and the color-frame flag (bit 7).

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: color flag bit	`[89, 9, 0, 25]`	`[217, 9, 0, 25]`	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.