← all videos

A ukulele is strummed, producing bright high-pitched chords. Then a bass guitar is strummed, producing deep low-pitched notes.

C2-1-25 Event Transition · source_body principle: Combined Frequency Factors (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 ukulele
  • a bass guitar

Event: a ukulele and a bass guitar are played

Audio presence

  • a ukulele
  • a bass guitar

Sound: ['ukulele strum', 'bass guitar strum']

Key standards

Visual physical commonsense (V-PC)

  • A small short-neck four-string ukulele is visibly played first, and a long-neck bass guitar is visibly played second.

Audio physical commonsense (A-PC)

  • The bass guitar notes carry a noticeably lower pitch than the ukulele chords.
  • The ukulele's strum has the bright mid-range chord timbre of a small four-string ukulele.
  • The bass guitar's strum has the deep resonant bass timbre of a long-neck bass.

Cross-modal physical commonsense (AV-PC)

  • Each strum sound aligns in time with a visible strum of its corresponding instrument.
  • The higher-pitched strum corresponds to the smaller ukulele.
  • The deeper strum corresponds to the long-necked bass guitar.