# Video sources and local reconstruction

This repository publishes annotations only. Download upstream videos into a local
directory after reviewing the upstream terms and access requirements.

| Component | Upstream repository | Pinned revision inspected for this release |
|---|---|---|
| QA annotations | `CASIA-IVA-Lab/ThinkStream` | `94a9d82bc74864ba6b705b52ffa3a2d4bc9733e8` |
| LLaVA video packages | `lmms-lab/LLaVA-Video-178K` | `6d8c562dc26d70042a0d9704d1cae58c94b89098` |
| Kinetics-700 video package | `omni-research/Tarsier2-Recap-585K` | `5cffa8342bbd9900fb50fdb7fd1b5f2cd1778ac4` |

The last source is access-gated. Request access on its Hugging Face page and log in
locally before downloading. Keep access tokens out of scripts and command history.
Pinned repository revisions document upstream file listings; they are not a claim
that every local video was byte-hashed against that revision.

## Required LLaVA subsets

The release references these five subsets, with their original names:

```text
0_30_s_youtube_v0_1
0_30_s_academic_v0_1
1_2_m_academic_v0_1
1_2_m_activitynetqa
2_3_m_academic_v0_1
```

`metadata/video_manifest.parquet` is the exact list of required files. Archives may
contain additional videos. Avoid downloading the entire upstream repository if only
these annotations are needed.

Example, sequential download of the required archive groups:

```python
from huggingface_hub import snapshot_download

subsets = [
    "0_30_s_youtube_v0_1", "0_30_s_academic_v0_1",
    "1_2_m_academic_v0_1", "1_2_m_activitynetqa", "2_3_m_academic_v0_1",
]
snapshot_download(
    repo_id="lmms-lab/LLaVA-Video-178K", repo_type="dataset",
    revision="6d8c562dc26d70042a0d9704d1cae58c94b89098",
    allow_patterns=[f"{subset}/*.tar.gz" for subset in subsets],
    local_dir="downloads/LLaVA-Video-178K", max_workers=1,
)
```

Inspect each archive's member paths, then extract each archive under its matching
subset directory. For example, for one archive:

```bash
mkdir -p /path/to/videos/LLaVA-Video-178K/0_30_s_youtube_v0_1
tar -xzf downloads/LLaVA-Video-178K/0_30_s_youtube_v0_1/0_30_s_youtube_v0_1_videos_1.tar.gz \
  -C /path/to/videos/LLaVA-Video-178K/0_30_s_youtube_v0_1
```

Historical annotations contain `.../<subset>/data/<source-folder>/...`. The archive
may instead extract `.../<subset>/<source-folder>/...`. The preparation script tries
both forms, so a machine-specific symlink is unnecessary. `liwei_youtube_videos`,
`academic_source`, and `ActivityNet-QA` are inherited upstream directory names.

## Kinetics-700 package

```python
from huggingface_hub import snapshot_download

snapshot_download(
    repo_id="omni-research/Tarsier2-Recap-585K", repo_type="dataset",
    revision="5cffa8342bbd9900fb50fdb7fd1b5f2cd1778ac4",
    allow_patterns=["Kinetics-700/videos.tar.part-*", "Kinetics-700/metadata.json"],
    local_dir="downloads/Tarsier2", max_workers=1,
)
```

The inspected package has 13 numbered `videos.tar.part-*` files. After obtaining all
parts, concatenate in filename order and extract the tar stream:

```bash
mkdir -p /path/to/videos/Kinetics-700
cat downloads/Tarsier2/Kinetics-700/videos.tar.part-* \
  | tar -xf - -C /path/to/videos/Kinetics-700
```

The archive contains `videos/<clip-id>.mp4`. Clip filenames such as
`<video-id>_000179_000189.mp4` identify an upstream clip; the annotation interval is
relative to that clip, not the original full YouTube timeline. Re-downloading from
another source can change clip boundaries or availability, so verify correspondence.

## Expected layout

```text
videos/
├── LLaVA-Video-178K/
│   ├── 0_30_s_youtube_v0_1/liwei_youtube_videos/...
│   ├── 0_30_s_academic_v0_1/academic_source/...
│   ├── 1_2_m_academic_v0_1/academic_source/...
│   ├── 1_2_m_activitynetqa/ActivityNet-QA/...
│   └── 2_3_m_academic_v0_1/academic_source/...
└── Kinetics-700/videos/...
```

Validate path mapping without writing output:

```bash
python scripts/prepare_local_data.py --video-root /path/to/videos --config current --check-only
```

Use `--llava-root` and `--kinetics-root` if sources are stored separately. The check
does not download, decode or modify videos. File existence alone cannot guarantee
correct clip identity, decodability, or the validity of every time interval.