← all videos

A pianist strikes a key without the sustain pedal and the note fades quickly. They strike the same key with the pedal pressed and the note rings on much longer.

C2-3-12 Event Transition · source_radiation principle: Resonance Amplification (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 pianist
  • a piano
  • a sustain pedal

Event: a pianist strikes a piano key

Audio presence

  • a piano

Sound: a piano note

Key standards

Visual physical commonsense (V-PC)

  • A pianist visibly strikes a piano key without pressing the sustain pedal during the first part of the clip.
  • The pianist visibly strikes a piano key with the sustain pedal pressed down by foot during the second part of the clip.

Audio physical commonsense (A-PC)

  • The first piano note fades quickly with rapid decay.
  • The second piano note rings on much longer with sympathetic resonance from other strings.

Cross-modal physical commonsense (AV-PC)

  • Each piano note onset aligns in time with the visible key strike.
  • The longer-decaying note in the audio is the one whose strike aligns with the pedal-pressed state.