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A gentle stream trickles over pebbles with a soft babble. The scene cuts to a massive waterfall roaring thunderously.

C2-2-16 Event Transition · source_excitation principle: Sound Source Power Comparison (Mechanics)
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Per-prompt rubric

Basic standards

Visual presence

  • a stream
  • pebbles
  • a waterfall

Event: a stream and a waterfall flow

Audio presence

  • a stream
  • a waterfall

Sound: flowing water

Key standards

Visual physical commonsense (V-PC)

  • The clip shows both a small stream trickling over pebbles and, after a scene cut, a large waterfall.

Audio physical commonsense (A-PC)

  • The waterfall roar is noticeably louder than the gentle stream babble.
  • The audio shifts between two distinct loudness states across the scene cut, from a quiet stream babble to a loud waterfall roar.

Cross-modal physical commonsense (AV-PC)

  • The soft babble aligns with the stream scene.
  • The thunderous roar aligns with the waterfall scene.