Motion Smoothness measures temporal interpolatability of a generated video under a frame-interpolation prior. VFIMamba reconstructs discarded odd frames from neighboring even frames; low reconstruction error indicates smooth, continuous motion—not correct semantics or magnitude.
For window k, I^2k+1=Φ(I2k,I2k+2) is compared to ground-truth odd frame I2k+1 via MSE, SSIM, and LPIPS. Raw components average over K windows:
Decoded uint8 frames are converted to float32 before MSE subtraction and squaring, so negative pixel differences cannot wrap modulo 256.
Each component is normalized independently; the final score is their arithmetic mean. Higher Ssmooth indicates smoother generated motion. The metric is official when computation succeeds and requires no reference video.
The configured MSE empirical bound predates v2_float32_mse. Corrected raw reports are versioned, but their normalized score remains provisional until that bound is recalibrated on the corrected benchmark corpus.
The higher-scoring side of each example moves visibly. Motion Magnitude only screened out nearly static videos; the displayed scores come from formal Motion Smoothness reports and retain the provisional normalization noted above.
Audit manifest: docs/assets/metric_examples/curated_same_case_manifest.json.
A cheetah runs across the savannah; its legs and body change position throughout the clip.
curator observation
The higher-scoring output also moves visibly. Motion Magnitude was used only to screen for visible motion; scores shown are Motion Smoothness. Both first frames passed geometric matching against the same input.
Model result videos will be available with the ModelScope release. / 模型推理视频将在 ModelScope 方案上线后提供。
Higher metric scoreScore 0.8239
Model result videos will be available with the ModelScope release. / 模型推理视频将在 ModelScope 方案上线后提供。
Lower metric scoreScore 0.2446
Input image
Input verified · same benchmark case · gap 0.4492
image_dynamic_photorealistic_rigid_0049
Suite: image_dynamicScene: photorealistic / rigid
Visible motion in this comparison
Aircraft and the airport view move visibly across the frame.
curator observation
The higher-scoring output also moves visibly. Motion Magnitude was used only to screen for visible motion; scores shown are Motion Smoothness. Both first frames passed geometric matching against the same input.
Model result videos will be available with the ModelScope release. / 模型推理视频将在 ModelScope 方案上线后提供。
Higher metric scoreScore 0.8947
Model result videos will be available with the ModelScope release. / 模型推理视频将在 ModelScope 方案上线后提供。
Lower metric scoreScore 0.4455
Input image
Input verified · same benchmark case · gap 0.7375
image_dynamic_photorealistic_fluid_0069
Suite: image_dynamicScene: photorealistic / fluid
Visible motion in this comparison
The waterfall flows while the view moves closer to the falling water.
curator observation
The higher-scoring output also moves visibly. Motion Magnitude was used only to screen for visible motion; scores shown are Motion Smoothness. Both first frames passed geometric matching against the same input.
Model result videos will be available with the ModelScope release. / 模型推理视频将在 ModelScope 方案上线后提供。
Higher metric scoreScore 0.7818
Model result videos will be available with the ModelScope release. / 模型推理视频将在 ModelScope 方案上线后提供。
