# camera_preview Preview local camera devices directly through OpenCV. ```bash s6 camera_preview ``` By default the command opens device indices `1` and `3`, displays them in one window with per-camera FPS overlays, and exits when you press `q`. Use `--device` to override the list: ```bash s6 camera_preview --device 1 3 ``` The current defaults are: - `--device 1 3` - `--width 1280` - `--height 960` - `--fps 50` - `--max-seq-skew 0` Use `--flip-stage` to apply one or more `videoflip` stages to every preview camera.