---
license: apache-2.0
language:
- en
---
# FastvideoWorldModel-MC

This dataset contains short Minecraft (MineDojo) episodes. Each episode is a folder with a video and optional JSON action annotations.

## File layout

```text
<dataset_root>/
  episode_<timestamp_utc>_w<worker_id>_<episode_index>_<run_name>/
    manifest.json
    video.mp4
    mg/
      mg_actions.json
    data.npz            # optional (advanced users)
```

## `video.mp4`

- H.264 (libx264)
- FPS and resolution are recorded in `manifest.json` (`fps`, `image_size_hw` where `image_size_hw = [H, W]`)
- The video has **96 frames** 

## `mg/mg_actions.json`

Per-frame action annotations (one entry per timestep).

Format:
- Top-level: JSON object (dict)
- Keys: `"0"` ... `"T-1"` (string timestep)
- Value per timestep:
  - `action`: `List[int]` (raw MineDojo MultiDiscrete action vector)
  - `move_action`: `str` in `{ "", "W", "A", "S", "D", "WA", "WD", "SA", "SD" }`
  - `view_action`: `str` in `{ "", "up", "down", "left", "right", "up_left", "up_right", "down_left", "down_right" }`

Notes:
- `view_action` is derived from the per-frame yaw/pitch delta.
- Convention: `dyaw > 0 => right`; `dpitch > 0 => down` (common Minecraft convention).

## Advanced (Pro): `data.npz` (optional)

Some episodes also include `data.npz` (created with `numpy.savez_compressed`). It contains **per-frame aligned** numpy arrays.

Keys (all aligned to the video frames; typically `T = 96`):

- `actions`: `int64`, shape `(T, D)`
  - raw MineDojo `MultiDiscrete` action vector per frame
  - `D` matches `len(manifest["action_nvec"])`
- `positions`: `float32` (sometimes `float64`), shape `(T, 3)`
  - Minecraft world position `(x, y, z)`
- `yaws`: `float32` (sometimes `float64`), shape `(T,)`
  - camera yaw in **degrees**
- `pitches`: `float32` (sometimes `float64`), shape `(T,)`
  - camera pitch in **degrees**

If you only need video + `mg_actions.json`, you can ignore `data.npz`.