# RGB Frames 🖼️

This directory contains extracted RGB frames from assembly videos. Frames are
organized by furniture category, furniture name, and video ID:

```text
rgb-frames/<category>/<furniture_name>/<video_id>/<frame_file>.jpg
```

Example:

```text
rgb-frames/Bench/applaro/KPs0ik2FcsY/0.jpg
rgb-frames/Bench/applaro/KPs0ik2FcsY/frame_id_to_fn.json
```

## Frame Files

- JPEG filenames are local sequential frame filenames, such as `0.jpg`,
  `1.jpg`, and `2.jpg`.
- The original source-video frame IDs may be different from the local JPEG
  filenames.

## `frame_id_to_fn.json` Schema

Each video folder contains a `frame_id_to_fn.json` file mapping source video
frame IDs to local extracted image filenames.

Example shape:

```json
{
  "1161": "0.jpg",
  "1191": "1.jpg",
  "1221": "2.jpg"
}
```

| Key | Value | Description |
|---|---|---|
| source frame ID | string | Frame index in the original or processed source video. |
| local filename | string | JPEG filename in the same directory. |

Use this mapping when aligning question prompt frames, extracted images, masks,
and source video timestamps.