FA-78535 / Broadcast timecode arithmetic / Member archive

Film feet and frames conversion: magnitude composition · case 05

Negative footage with frames converts to a count several frames too small.

Member previewVariant 5 · 3 implementations · 9 checks per implementation

Case contract

Frames per foot: 35mm4 16, 35mm2 32, 16mm 40. An int frame count converts to "[-]F+ff" (feet, two-digit frames, sign in front for negatives); a string "[-]F+ff" converts to a signed frame count, with ff below frames per foot (else None). "-0+05" means -5.

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: magnitude composition	`105`	`-135`	Failed

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

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