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A small firecracker pops with a sharp high crack. A large firework shell explodes with a deep thunderous boom.

C2-1-16 Event Transition · source_body principle: Object Size -> Pitch (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 firecracker
  • a firework shell

Event: a firecracker and a firework shell explode

Audio presence

  • a firecracker
  • a firework shell

Sound: ['a firecracker crack', 'a firework shell boom']

Key standards

Visual physical commonsense (V-PC)

  • Both the small firecracker and the large firework shell visibly detonate in the clip, each producing its own distinct explosion.

Audio physical commonsense (A-PC)

  • The large firework shell's boom is noticeably lower in pitch than the small firecracker's sharp crack.
  • The sounds are discrete real explosion impulses.

Cross-modal physical commonsense (AV-PC)

  • Each explosion sound aligns in time with the corresponding visible detonation.
  • The sharp high crack corresponds to the small firecracker.
  • The deep thunderous boom corresponds to the large firework shell.