FB-C05 — Movement-Coupled Source

1 · Objective

Test whether a single event remains correctly attached to a moving source without disrupting locomotion or scene coherence.

Location: quiet modern office hallway
Subjects: one adult walking from left to right across frame
Target actor: adult man in a dark green overshirt and jeans
Role: sole event source
Motion: steady left-to-right walk
Lighting: neutral overhead lighting

2 · Canonical semantic specification

The canonical specification is model-independent and outranks every rendered prompt. If a rendered prompt changes the meaning of this specification, the prompt is invalid.

Generation condition

Input mode: text-to-audio-video
Duration: 8.0 s
Aspect ratio: 16:9
Visual style: photorealistic realistic live action
Shot structure: single continuous shot
Reference media: none
Music: none
Rerolls: Prohibited

Audio condition

Fart audible: Yes
Fart count: 1
Fart character: short natural human flatulence
Spatial origin: moves consistently with target actor
Ambient: subtle hallway HVAC and footsteps
Dialogue: none

Camera

Framing: wide side-on shot
Movement: static
Target visible: Yes
Cuts: 0

Prohibited

visible gas or smoke
defecation
additional fart events
stopping or falling because of fart
teleportation
music
dialogue

3 · Primary evaluated dimensions

6 of 7 dimensions apply to this test. FARTScore renormalizes the base weights over the applicable set, so a non-applicable dimension is excluded rather than scored as zero.

Applicable dimensions with base and renormalized weights.
Code	Dimension	Base weight	Renormalized	Applicability
A	Acoustic Condition Fidelity	22%	24.4%	Applicable
T	Event / AV Temporal Alignment	16%	17.8%	Applicable
L	Source Localization	16%	17.8%	Applicable
P	Physical / Body-Motion Plausibility	14%	15.6%	Applicable
I	Instruction Adherence	12%	13.3%	Applicable
S	Social-Causal Response	10%	—	Not applicable
C	Temporal / Identity Coherence	10%	11.1%	Applicable

4 · Required event structure

0.0–2.5 s
target walks steadily left to right; no fart occurs
2.5–4.5 s
while continuing the same stride, target produces exactly one short fart; sound remains spatially associated with the moving target
4.5–8.0 s
target keeps walking at the same general pace with only a subtle self-conscious glance; no further fart occurs

Objective checks

Raters answer these observable questions before recording perceptual scores, so that an overall impression cannot overwrite a factual failure.

Objective compliance checks recorded before subjective scoring.
Field	Expected
event_present	true
event_count	1
correct_actor	true
source_tracks_moving_actor	true
continuous_walking	true
visible_gas	false
defecation	false

5 · Prompt adapter policy

A versioned model adapter may reorganize the canonical facts into the form its creator documents. It may not make the task easier, add creative facts, remove a hard requirement, change the designated actor, change the event count, materially widen the timing window, or respond to observed benchmark failures. Prompt bytes are hashed and immutable once a benchmark generation has been viewed.

Rendered prompts not yet commissioned for this test

Adapter renderings are frozen one test at a time. FB-C02 is the current commissioning wave; FB-C05 renderings are produced after the nine-clip smoke test is reviewed.

Published when the FB-C02 smoke test is accepted and the development pilot expands to all eight tests.

6 · Known failure modes

Failure codes of interest for this test, recorded as multi-label flags. A clip may carry several.

7 · Results by configuration

No locked evaluations for this test

23 Core AV configurations are commissioned against the current prompt pack. None has completed blind human evaluation under Core v0.1.0, so no per-configuration result exists to publish.

Published when at least three independent raters have locked evaluations for a configuration's 3 replicates.

Development pilot target: 8 tests × 3 models × 3 replicates = 72 clips. All pilot data remains development data; the Core v1.0 freeze happens only after that pilot is analysed without reusing its scores.

8 · Representative generations

No public clips

Raw benchmark outputs are immutable evidence and are not published before the evaluations that reference them are locked. Explicit output is retained privately as evidence and omitted from any public gallery.

Published when the first evaluation round is locked and a playback derivative with its own hash is produced for each published clip.

9 · Version and provenance

Test ID: FB-C05
Specification: v0.1.0
Protocol: Core v0.1.0
Status: Pilot development
Frozen: 2026-09-09
Replicates: 3 (pilot)
Seeds: 104729 · 130363 · 155921
Spec SHA-256: e5cfa3bb485136357be17846754b301d435ddd036c3b430675def0bccb4d7eb6

10 · Machine-readable specification

Download FB-C05.yaml All release artifacts

The YAML above is the canonical artifact this page is generated from — the page cannot drift from the file it offers.