stablemotion-onnx

StableMotion ONNX

ONNX conversion for the StableMotion Correction sequence post-processor in Vision To Pose.

This model is published only for non-commercial research use. The StableMotion source code is MIT-licensed, while the checkpoint was trained on BrokenAMASS derived from AMASS and remains subject to applicable StableMotion, AMASS, SMPL, and source-dataset terms. This conversion grants no commercial rights and does not replace or expand any upstream license.

Limitations

• Intended only for non-commercial research and the Vision To Pose cleanup workflow.
• Trained at 20 FPS on BrokenAMASS; motion outside that domain may be missed or changed undesirably.
• StableMotion is probabilistic. The integration fixes seed 10, validates rotations, preserves samples outside detected intervals, and rolls back failed bakes, but cannot guarantee improvement for every animation.
• Low-frame-rate input is upsampled and contains less recoverable temporal detail.
• Face, fingers, custom controls, and FK/IK switches are not model outputs. Results still depend on the source detector, target rig, and mapping quality.

Source and contract

• Upstream: https://github.com/Murrol/StableMotion
• Pinned source commit: 45d8836ce5cd7ae70f0065fdac672debfdfd6066
• Official EMA checkpoint member: stablemotion/ema001000000.pt
• Checkpoint archive SHA-256: b117ea6f3cefd92d3bc804b311bdcb003c4a4c6382bb697d10d7629c6665053c
• Model clock: 20 FPS
• Window: 100 frames
• Representation: 232 motion features plus one quality-label feature
• Sampling: official 50-step cosine diffusion, basic detection, threshold 0.5, one-frame mask dilation, then fixing/inpainting

The immutable runtime bundle is flat under onnx/. onnx/manifest.json declares every file size and SHA-256, graph names, source checkpoint identity, and the self-test contract.

Validation status

Technical conversion gates pass locally:

• PyTorch EMA-to-ONNX denoiser parity
• Full detect/dilate/fix parity with identical masks
• 10, 20, 24, 25, 29.97, 30, 50, 59.94, and 60 FPS plus variable-rate timing
• Blender quaternion continuity and FK/IK safety tests
• Recorded MediaPipe and SAM3D Body VRoid pose preservation
• Injected 155-degree arm discontinuity reduced to approximately 3.46 degrees without a new flip

onnx/parity_report.json contains the detailed measurements. Use of the model remains subject to the non-commercial and upstream-license limitations above.