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A person speaks normally, then inhales SF6 gas and speaks again. Their voice drops dramatically to a deep gravelly tone.

C2-1-43 Event Transition · source_body principle: Gas Density & Vocal Resonance (Fluid)
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 person
  • an SF6 gas source

Event: a person inhales gas and speaks

Audio presence

  • a person

Sound: human speech

Key standards

Visual physical commonsense (V-PC)

  • The person performs a visible inhalation action from a held source before the second speaking segment.
  • The held source is a plausible gas-delivery container with no liquid contents.

Audio physical commonsense (A-PC)

  • The post-inhale voice is noticeably deeper and more gravelly in timbre than the pre-inhale voice.

Cross-modal physical commonsense (AV-PC)

  • Each speech segment in the audio coincides in time with the person's visible mouth movements.