| # Session metadata schema |
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| Per-clip `metadata/*.json` includes a `session` object. One session per delivered clip. |
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| ## Fields |
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| | Field | Type | Description | |
| |-------|------|-------------| |
| | `session_id` | string | e.g. `GGN_20260618_S01` (date + clip rank) | |
| | `capture_date` | string | ISO date `YYYY-MM-DD` | |
| | `timezone` | string | IANA tz, e.g. `Asia/Kolkata` | |
| | `collector_id` | string | Anonymous worker ID, e.g. `WRK_846159` | |
| | `clips_in_session` | int | `1` for current sample pack | |
| | `indoor_outdoor` | string | `indoor` or `outdoor` | |
| | `lighting` | string | `tubelight_cfl`, `mixed`, or `natural` | |
| | `mount_type` | string | `head_mounted_via_headband_egocentric` | |
| | `task_id` | string | Dominant task from `action_segments.jsonl` | |
| | `time_reference` | string | `clip_start` — timestamps relative to deliverable MP4 | |
| | `utc_available` | bool | `false` unless wall-clock from source file is added | |
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| ## Related files |
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| | Path | Purpose | |
| |------|---------| |
| | `sessions/{session_id}.json` | Session record + link to clip and timestamps CSV | |
| | `sessions/session_index.json` | Index of all sessions | |
| | `annotations/timestamps/{clip}_timestamps.csv` | `frame_idx`, `timestamp_sec` (clip-relative) | |
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| ## Aligning annotations |
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| - `action_segments.jsonl` `start_sec` / `end_sec` — same clip-relative clock as `timestamps.csv` |
| - Keypoints / object boxes `timestamp_sec` — same clock |
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