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A shot of a busy city street at night with noisy traffic flowing past. A calm voice-over says, "Movement never truly stops."

C1-2-22 Steady State · source_anchoring principle: Non-Diegetic Sound (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

  • a city street
  • traffic

Event: traffic flows on a city street at night

Audio presence

  • traffic
  • a narrator

Sound: ['traffic noise', 'a voice-over']

Key standards

Visual physical commonsense (V-PC)

  • All visible cars in the street move continuously and realistically throughout the clip, without sticking together, wobbling laterally, or clipping through each other.

Audio physical commonsense (A-PC)

  • The voice-over is clean and dry with studio-recording quality and no room reverberation.

Cross-modal physical commonsense (AV-PC)

  • The voice-over plays as a non-diegetic overlay with no visible source in the scene.