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+# ComfyUI-8cut Node Pack Design
+
+Date: 2026-04-19
+
+## Goal
+
+Port 8-cut's video scanning, training, review, and export workflow to a ComfyUI node pack. The primary motivation is **remote access** — ComfyUI's web UI allows browser-based operation over the network, and HTML5 `<video>` handles streaming compression natively. No tensor-based image pipeline; videos stay as file paths throughout.
+
+## Architecture
+
+### Approach
+
+Monolithic Review Node + simple pipeline nodes. One central **VideoReview** node embeds the full interactive player/timeline/region table as a large DOM widget. Other nodes (Scan, Train, Export) are headless pipeline nodes that pass lightweight metadata.
+
+### Core reuse
+
+The entire `8-cut/core/` package is Qt-free and reusable as-is:
+- `core/audio_scan.py` — `scan_video()`, `train_classifier()`, `load_classifier()`
+- `core/db.py` — `ProcessedDB` (SQLite, all scan/training/export persistence)
+- `core/ffmpeg.py` — `build_ffmpeg_command()` (clip export)
+- `core/tracking.py` — YOLO-based subject tracking
+- `core/paths.py` — path helpers, `format_time()`
+
+No porting required — these are imported directly.
+
+---
+
+## Node Pack Structure
+
+```
+ComfyUI-8cut/
+  __init__.py                    # NODE_CLASS_MAPPINGS, WEB_DIRECTORY
+  core/                          # symlink or copy of 8-cut/core/
+  data/
+    8cut.db                      # separate SQLite DB (can copy from ~/.8cut.db)
+  models/                        # trained classifiers (.joblib)
+  nodes/
+    load_video.py
+    audio_scan.py
+    video_review.py
+    train_model.py
+    export_clips.py
+  server_routes.py               # custom API routes
+  web/
+    js/
+      video_review.js            # timeline + player + scan panel widget
+```
+
+---
+
+## Custom Types
+
+No tensors anywhere in the pipeline. All data flows as lightweight metadata:
+
+| Type | Python value | Purpose |
+|------|-------------|---------|
+| `VIDEO_PATH` | `str` (absolute path) | Video file reference |
+| `SCAN_REGIONS` | `list[dict]` with start/end/score/model/disabled | Scan output / review edits |
+| `SCAN_MODEL` | `str` (path to .joblib) | Trained classifier |
+
+---
+
+## Nodes
+
+### LoadVideo
+
+| | |
+|---|---|
+| **Input** | `video_path` (STRING, file browser), `profile` (STRING combo from DB profiles) |
+| **Output** | `VIDEO_PATH`, `filename` (STRING) |
+| **Logic** | Validates path exists, returns it. Populates profile combo via API route. |
+
+### AudioScan
+
+| | |
+|---|---|
+| **Input** | `VIDEO_PATH`, `SCAN_MODEL`, `threshold` (FLOAT 0-1), `hop` (FLOAT) |
+| **Output** | `SCAN_REGIONS` |
+| **Logic** | Calls `core.audio_scan.scan_video()` directly. Progress via `PromptServer.send_sync("progress", ...)`. |
+
+### VideoReview (interactive, blocking)
+
+| | |
+|---|---|
+| **Input** | `VIDEO_PATH`, `SCAN_REGIONS` (optional) |
+| **Output** | `SCAN_REGIONS` (edited) |
+| **OUTPUT_NODE** | `True` |
+| **Logic** | Execution pauses here. User interacts via the widget. Clicks "Continue" to pass edited regions downstream. |
+
+The widget layout:
+
+```
++-------------------------------------+
+|  [video player (HTML5 <video>)]     |
+|  +- timeline with scan regions ----+|
+|  |  cursor + region drag/resize    ||
+|  +---------------------------------+|
+|  +- model tabs [EAT_LARGE][HuBERT]+|
+|  | Time   | End    | Score         ||
+|  | 1:23   | 1:31   | 0.92          ||
+|  | 3:45   | 3:53   | 0.87          ||
+|  | [Add Negative] [Export] [Continue]|
+|  +---------------------------------+|
++-------------------------------------+
+```
+
+Widget size: ~640x500px minimum, resizable via LiteGraph.
+
+**Blocking mechanism**: The node's `run()` method blocks on a server-side event/queue. The frontend signals completion via `POST /8cut/review_done/{node_id}`, which unblocks `run()` and returns the edited `SCAN_REGIONS`.
+
+### TrainModel
+
+| | |
+|---|---|
+| **Input** | `profile` (STRING combo), `positive_folder` (STRING combo), `negative_folder` (STRING combo, optional), `embed_model` (STRING combo from `_EMBED_MODELS`), `use_hard_negatives` (BOOL) |
+| **Output** | `SCAN_MODEL` |
+| **Logic** | Queries `db.get_training_data()` to assemble `video_infos`, calls `core.audio_scan.train_classifier()`. Saves to `models/{profile}_{embed_model}.joblib` with version rotation. Progress via ComfyUI progress bar. |
+
+### ExportClips
+
+| | |
+|---|---|
+| **Input** | `VIDEO_PATH`, `SCAN_REGIONS`, `output_folder` (STRING), `short_side` (INT), `format` (combo MP4/WEBM), `spread` (FLOAT), `clip_count` (INT), `fuse_gap` (FLOAT) |
+| **Output** | exported file paths (list) |
+| **Logic** | Region fusion via `_build_export_spans()`, then `core.ffmpeg.build_ffmpeg_command()` per clip. Records each clip in DB via `db.add()`. |
+
+### Typical workflow
+
+```
+[LoadVideo] --> [AudioScan] --> [VideoReview] --> [ExportClips]
+                    ^
+              [TrainModel]
+```
+
+### Training loop (hard negatives round-trip)
+
+1. Scan with existing model -> regions in VideoReview
+2. Review -> mark false positives as negatives (DB)
+3. Train -> new model uses hard negatives
+4. Rescan -> better results
+5. Repeat
+
+---
+
+## API Routes
+
+### Video serving
+
+| Route | Method | Purpose |
+|-------|--------|---------|
+| `/8cut/video` | GET | Serve raw video file via `web.FileResponse`. Query param: `path`. Browser decodes mp4/h264 natively — key for remote streaming. |
+| `/8cut/video_transcode` | GET | Fallback: transcode to webm on-the-fly via ffmpeg `StreamResponse` for browser-incompatible formats (some MKV, odd codecs). |
+
+### Region editing (from VideoReview widget)
+
+| Route | Method | Purpose |
+|-------|--------|---------|
+| `/8cut/toggle_region` | POST | `toggle_scan_result_disabled()` |
+| `/8cut/resize_region` | POST | `update_scan_result()` |
+| `/8cut/delete_region` | POST | `delete_scan_result()` |
+| `/8cut/add_negatives` | POST | `add_hard_negatives()` |
+| `/8cut/scan_versions` | GET | `get_scan_versions()` |
+| `/8cut/review_done/{node_id}` | POST | Unblock the VideoReview node's `run()`, pass final regions |
+
+### Data queries (for combo widget population)
+
+| Route | Method | Purpose |
+|-------|--------|---------|
+| `/8cut/profiles` | GET | `db.get_profiles()` |
+| `/8cut/export_folders` | GET | `db.get_export_folders()` |
+| `/8cut/models` | GET | List available `.joblib` models |
+
+---
+
+## Frontend JS Widget (`web/js/video_review.js`)
+
+Registered via `app.registerExtension()`. Hooks into the VideoReview node's `onNodeCreated` and `onExecuted` callbacks.
+
+### Components
+
+1. **Video player** — HTML5 `<video>` element, src pointed at `/8cut/video?path=...`
+2. **Timeline** — `<canvas>` overlay below the video. Renders:
+   - Scan region rectangles (color-coded by score, red for negatives, gray for disabled)
+   - Cursor line (click to seek)
+   - Drag handles on region edges (resize)
+   - Waveform (optional, fetched via separate route)
+3. **Region table** — HTML table with model tabs. Click row to seek. Columns: Time, End, Score.
+4. **Action buttons** — Add Negative, Export, Continue
+5. **Version combo** — dropdown to switch scan history versions
+
+### Interaction flow
+
+- Widget activates when `onExecuted` fires with scan regions
+- User clicks/drags timeline, edits regions, marks negatives
+- Each edit hits an API route (immediate DB persistence)
+- "Continue" sends `POST /8cut/review_done/{node_id}` with final region state
+- Node's `run()` unblocks, passes `SCAN_REGIONS` downstream
+
+---
+
+## DB
+
+Separate SQLite DB at `ComfyUI-8cut/data/8cut.db`. Uses the existing `ProcessedDB` class unchanged — same schema, same migration code. Users can copy their existing `~/.8cut.db` to carry over scan history, training data, and hard negatives.
+
+---
+
+## Dependencies
+
+Same as 8-cut's `requirements.txt` minus PyQt6/python-mpv:
+- `torch`, `torchaudio`, `torchvision` (from CUDA index)
+- `transformers>=4.30,<5.0`, `timm>=0.9`
+- `librosa`, `scikit-learn`, `joblib`, `soundfile`, `numpy`
+- `ultralytics` (YOLO tracking)
+
+ComfyUI already provides torch. The node pack's install script just needs the audio/ML extras.
+
+---
+
+## Implementation Priority
+
+1. **Node pack skeleton** — structure, `__init__.py`, custom types, API routes for video serving
+2. **LoadVideo + AudioScan** — headless nodes, no widget needed yet
+3. **VideoReview widget (minimal)** — video player + static region display + Continue button
+4. **VideoReview interactivity** — timeline click/drag, region editing, negative marking
+5. **TrainModel + ExportClips** — complete the pipeline
+6. **Polish** — version history, waveform overlay, transcode fallback