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An ambulance with its siren blaring approaches a person on a sidewalk. As it gets closer the siren pitch rises higher, and as it speeds away the pitch drops lower.

C2-3-06 Event Transition · source_radiation principle: Doppler Effect (Wave)
Seedance 2.0ByteDance · proprietary
Kling 3.0 OmniKuaishou · proprietary
Veo 3.1Google · proprietary
LTX-2.3Lightricks · open
Ovi 1.1character.ai · open
JavisDiT++JavisDiT · open
MagiHumanGAIR-NLP · open
Per-prompt rubric

Basic standards

Visual presence

  • an ambulance
  • a person
  • a sidewalk
  • a road

Event: an ambulance passes a person on a sidewalk

Audio presence

  • an ambulance siren

Sound: a siren

Key standards

Visual physical commonsense (V-PC)

  • The ambulance approaches, passes, and recedes from the observer along the road with continuous motion.

Audio physical commonsense (A-PC)

  • The siren pitch is noticeably higher during the approach segment than during the receding segment.

Cross-modal physical commonsense (AV-PC)

  • The transition from higher to lower siren pitch aligns in time with the ambulance's visible passage past the observer.