FA-78497 / Broadcast timecode arithmetic / Member archive

EDL speed-change record out: duration rounding · case 02

Slow-motion events are a frame short on the record side.

Member previewVariant 2 · 3 implementations · 9 checks per implementation

Case contract

event [src_in, src_out, rec_in, speed_percent] with non-drop labels at fps; src_out is exclusive and may cross midnight. Record duration = source frames * 100 / |speed| rounded half up (reverse speeds use the magnitude; speed 0 returns None). Return [record_out label (exclusive, wrapped at 24 h), record duration].

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: duration rounding	`["06:29:01:05", 629256]`	`["06:29:01:06", 629257]`	Failed

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