Qualitative examples: single prompt vs. prompt set (VideoPhy-2)

Two example scenarios from the human study over prompt sets (Section 4.3 and Appendix I of the revised paper). They are the two scenarios in which the original single prompt and the prompt set differ most in how they order the three models. They illustrate the result and are not its basis; the result over all 15 scenarios is in the table below.

Each example shows the videos of three models for the original prompt and two of its five equivalent rewrites, with the evaluator's physical commonsense (PC) and semantic adherence (SA) scores. A video passes when both are at least 4, as defined by the benchmark. The summary above the videos covers all six prompts. Four raters compared the videos of two models pairwise for three of the six prompts (12 votes per model pair), without knowing which model or prompt produced a video.

All 15 scenarios, ranking byOrder of the three modelsModel pairs ordered as by the raters
Human raters (share of comparisons won)Wan2.1-14B 66% > CogVideoX-5B 57% > SDXL+SVD-XT 27%
Prompt set (pass rate)Wan2.1-14B 41.1% > CogVideoX-5B 36.7% > SDXL+SVD-XT 35.6%3 of 3
Original single prompt (pass rate)SDXL+SVD-XT 46.7% > Wan2.1-14B 40.0% > CogVideoX-5B 33.3%1 of 3

Example 1: Leaf blower

Original single prompt (pass or fail)SDXL+SVD-XT = Wan2.1-14B > CogVideoX-5Bagrees with the raters on 0 of 3 model pairs
Prompt set (passes out of six prompts)Wan2.1-14B > CogVideoX-5B > SDXL+SVD-XT (Wan2.1-14B 6, CogVideoX-5B 5, SDXL+SVD-XT 4)agrees with the raters on 2 of 3 model pairs
Human ratersCogVideoX-5B > Wan2.1-14B > SDXL+SVD-XTCogVideoX-5B over SDXL+SVD-XT: 12 to 0; CogVideoX-5B over Wan2.1-14B: 11 to 1; Wan2.1-14B over SDXL+SVD-XT: 8 to 4
SDXL+SVD-XTWan2.1-14BCogVideoX-5B
Original prompt
shown to raters
A leaf blower is pointed at a patch of leaves on a lawn; the leaves are forcefully displaced in a specific direction.
PC 4 · SA 4 · pass
PC 4 · SA 4 · pass
PC 3 · SA 4 · fail
Rewrite 3
shown to raters
A leaf blower is directed at a patch of leaves on a lawn; the leaves are forcefully displaced in a specific direction.
PC 3 · SA 4 · fail
PC 4 · SA 4 · pass
PC 4 · SA 4 · pass
Rewrite 5
A leaf blower is aimed toward a patch of leaves on a lawn; the leaves are forcefully displaced in a specific direction.
PC 5 · SA 3 · fail
PC 4 · SA 4 · pass
PC 4 · SA 4 · pass

Example 2: Surfer

Original single prompt (pass or fail)SDXL+SVD-XT = CogVideoX-5B > Wan2.1-14Bagrees with the raters on 0 of 3 model pairs
Prompt set (passes out of six prompts)CogVideoX-5B > Wan2.1-14B > SDXL+SVD-XT (CogVideoX-5B 5, Wan2.1-14B 4, SDXL+SVD-XT 3)agrees with the raters on 2 of 3 model pairs
Human ratersWan2.1-14B > CogVideoX-5B > SDXL+SVD-XTWan2.1-14B over CogVideoX-5B: 12 to 0; Wan2.1-14B over SDXL+SVD-XT: 10 to 2; CogVideoX-5B over SDXL+SVD-XT: 8 to 4
SDXL+SVD-XTWan2.1-14BCogVideoX-5B
Original prompt
shown to raters
A surfer performs a sharp turn on their board, creating a spray of water.
PC 4 · SA 4 · pass
PC 3 · SA 4 · fail
PC 4 · SA 4 · pass
Rewrite 1
shown to raters
A surfer makes a sharp turn on their board, creating a spray of water.
PC 4 · SA 3 · fail
PC 4 · SA 4 · pass
PC 4 · SA 4 · pass
Rewrite 5
shown to raters
A surfer executes a sharp turn on their board, producing a spray of water.
PC 4 · SA 3 · fail
PC 3 · SA 4 · fail
PC 3 · SA 4 · fail