Time-Lapse Interval Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-229

Effect

Computation or source lookup only

Input and validation requirements

The calculator breaks or must reject an output-fps value of zero because interval calculation divides by zero. It also has an undocumented unit ambiguity and cannot calculate the requested storage estimate because no image size or storage-per-shot input is specified.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "shootDurationSeconds": 7200,
    "finalDurationSeconds": 30,
    "fps": 30
  },
  "expected_outputs": {
    "intervalSeconds": 8,
    "totalShots": 900
  },
  "working": "totalShots = finalDuration × fps = 30 × 30 = 900 shots. interval = shootDuration ÷ totalShots = 7200 ÷ 900 = 8 seconds."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json