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A person lifts a very heavy barbell overhead. As they push harder, they involuntarily grunt louder and louder.

C2-2-13 Event Transition · source_excitation principle: Vocal Effort -> Loudness (Mechanics)
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
  • a barbell

Event: a person lifts a barbell overhead

Audio presence

  • a person

Sound: a person grunting

Key standards

Visual physical commonsense (V-PC)

  • The person visibly lifts a barbell from a low position up over their head while standing, with visibly increasing strain.
  • The barbell has standard proportions with weight plates at the ends of the bar.

Audio physical commonsense (A-PC)

  • The grunts grow progressively louder as the lifting effort intensifies.
  • The sound is a real human grunt with throat and chest strain.

Cross-modal physical commonsense (AV-PC)

  • The rising grunt loudness aligns in time with the person's visibly increasing lifting effort.
  • The loudest grunt corresponds to the hardest overhead push moment.
  • The quieter sounds correspond to less-strained phases of the lift.