---
pretty_name: MotionFix MotionHub Format
language:
- en
license: other
tags:
- motion
- motion-editing
- smpl-h
- motionhub
task_categories:
- text-to-3d
---

# MotionFix MotionHub Format

This dataset contains the processed MotionFix motion-editing data in the MotionHub format.
It stores paired source and target motions as SMPL-H 52-joint parameter files, plus editing instructions and split annotations.

Please also follow the license and terms of the original MotionFix dataset.

## Structure

```text
MotionFix/
├── smplh_52/
│   ├── train/
│   │   ├── 000000_000499/
│   │   ├── 000500_000999/
│   │   └── ...
│   ├── val/
│   └── test/
├── pairs/
│   ├── train/
│   │   ├── 000000_000499/
│   │   ├── 000500_000999/
│   │   └── ...
│   ├── val/
│   └── test/
├── motionfix_train.json
├── motionfix_val.json
├── motionfix_train_val.json
├── motionfix_test.json
├── motionfix_all.json
├── stats.json
└── stats_target_only.json
```

## Splits

| Split | Pairs | Frames | Hours |
|---|---:|---:|---:|
| train | 6,730 | 744,502 | 6.894 |
| val | 330 | 36,420 | 0.337 |
| test | 1,013 | 111,454 | 1.032 |
| train_val | 7,060 | 780,922 | 7.231 |
| all | 8,073 | 892,376 | 8.263 |

Each pair has one source motion and one target motion. The `smplh_52/` directory therefore contains 16,146 `.npz` files.
Files are sharded by pair id ranges so that no directory exceeds Hugging Face's file-count limit.
For example, pair `000000` stores its motions under `smplh_52/train/000000_000499/` and metadata under `pairs/train/000000_000499/`.

## Annotation Fields

Each item in `motionfix_*.json` includes:

- `motion_path`, `smplh_path`: target motion path.
- `source_motion_path`, `source_smplh_path`: source motion path.
- `caption_path`, `edit_pair_path`: pair metadata path.
- `caption`, `instruction`: editing instruction text.
- `fps`, `duration`, `num_frames`, `language`.

Each file in `pairs/` includes the source/target motion paths, the edit instruction, source/target timestamps, and canonicalization metadata.

## Motion Format

Each `.npz` stores SMPL-H compatible fields:

- `poses`: `(T, 156)` axis-angle pose parameters.
- `global_orient`: `(T, 3)`.
- `body_pose`: `(T, 63)`.
- `left_hand_pose`, `right_hand_pose`: `(T, 45)` each.
- `trans`, `transl`: `(T, 3)` body-model translation.
- `betas`: zero-beta shape vector.
- `expression`: zero expression vector.
- `mocap_framerate`, `gender`, `num_frames`.

The processed motions are canonicalized to the MotionHub SMPL-H convention and use body-model translation.