# Dashcam Project

## Status

### Completed (2026-04-11)

- Disabled comma training data video encoding (`encoderd`) — CAN/sensor logs still recorded
- Re-enabled FrogPilot OMX screen recorder (H.264 MP4, 1440x720, 2Mbps, hardware encoded)
- Auto-start/stop recording tied to car ignition (`scene.started`)
- `ScreenRecorderDebug` param for bench testing without car connected
- Hidden all recorder UI elements — invisible to driver
- Videos saved to `/data/media/0/videos/YYYYMMDD-HHMMSS.mp4`, 3-minute segments
- Deleter updated: 9 GB free space threshold, rotates oldest videos first
- Cleaned up offroad UI: replaced stock home screen with grid launcher (Settings + Dashcam buttons)

### Next: Dashcam Footage Viewer

Build a native Qt widget accessible from the offroad home screen "Dashcam" button.

**Requirements:**
- List MP4 files from `/data/media/0/videos/` sorted newest first
- Tap a file to play it back using Qt Multimedia (`QMediaPlayer` + `QVideoWidget`)
- Only accessible when offroad (car in park or off)
- Back button to return to offroad home
- No rotation hacks needed — native Qt widget in existing UI tree handles rotation correctly

**Architecture:**
- New widget class (e.g. `DashcamViewer`) added to `selfdrive/ui/qt/`
- Wire into `HomeWindow`'s `QStackedLayout` alongside `home`, `onroad`, `ready`, `driver_view`
- Dashcam button in `OffroadHome` switches `slayout` to the viewer
- Viewer has a file list view and a playback view (sub-stacked layout)
- Back button returns to `OffroadHome`
- Build: add to `qt_src` list in `selfdrive/ui/SConscript`, link `Qt5Multimedia`

**Previous webview attempts (abandoned):**
- Brian tried QWebEngineView for browser-based playback but the WebEngine subprocess renders independently of Qt's widget tree
- Screen rotation (`view.rotate(90)`, Wayland `wl_surface_set_buffer_transform`) did not work for WebEngine content
- Native Qt widget approach avoids this problem entirely

## Key Files

| File | Role |
|------|------|
| `selfdrive/frogpilot/screenrecorder/screenrecorder.cc` | Recording logic, auto-start/stop |
| `selfdrive/frogpilot/screenrecorder/omx_encoder.cc` | OMX H.264 hardware encoder |
| `selfdrive/ui/qt/onroad.cc` | Timer driving frame capture |
| `selfdrive/ui/qt/home.cc` | Offroad home with Dashcam button |
| `system/loggerd/deleter.py` | Storage rotation |
| `/data/media/0/videos/` | Video output directory |