emeetctl
Open source · MIT OR Apache-2.0

emeetctlOpen source Linux control for the EMEET SmartCam S600L

Ring light, image controls, microphones, recording and live preview on Linux, where the vendor app (EMEET Studio) only exists for Windows and macOS.

Download for Linux View on GitHub
emeetctl window, Light tab: preview area on the left; on the right, the five tabs (Light, Image, Microphone, Record, Device), toggles for the fill light and the RGB ring, mode buttons (cool, warm, balanced, color, rainbow), color presets with a hex field, and a brightness slider at 42%.
The Light tab. The app interface is currently in Brazilian Portuguese.
any RGB
ring color, not just 6 presets
~60fps
MJPEG 1280×720 live preview
3
interfaces: GUI, CLI, MCP
0
firmware writes, by design

Features

Everything the S600L exposes for the light, the image and the microphone, plus recording, from one native Linux app.

Ring light

Fill light and RGB ring

  • Fill light on/off and RGB ring on/off, independently.
  • Brightness control.
  • Any RGB color. The vendor app only offers 6 presets.
Cool
Warm
Balanced
Fixed color
Rainbow
Live preview

See what the camera sees

MJPEG 1280×720 at ~60 fps, right next to the controls.

When you pause the preview, the camera is released, so its in-use LED goes off.

Image controls

Every image control, in one place

  • Brightness
  • Contrast
  • Saturation
  • Hue
  • Gamma
  • Sharpness
  • Gain
  • Backlight compensation
  • Exposure: auto / manual
  • White balance: auto / 2300–7500 K
  • Focus: auto / manual
  • Zoom 0–400
  • Anti-flicker 50 / 60 Hz
  • Factory reset

"Auto" switches unlock the matching manual control: turn auto exposure off and the exposure slider comes alive.

emeetctl window, Image tab: exposure section with the Auto switch on and the exposure time slider locked, gain and backlight compensation sliders; white balance with Auto on and the temperature slider locked at 4750 K; brightness slider at 130.
The Image tab.
Microphones

The camera mic and any USB mic

  • The S600L mic, a Yeti Nano or any other USB mic: gain, mute and a live level meter.
  • Headphone volume for mics with a headphone jack (Yeti Nano).
  • Make it the system default input, and see which apps are recording from it.
  • Clean microphone: a new input "<mic> (limpo)" with WebRTC noise suppression and speaker echo cancellation. No PipeWire restart.
emeetctl window, Microphone tab: a picker between the S600L (camera) and the Yeti Nano, with the Yeti Nano selected; its card has an On switch, a gain slider at 0 dB and a level meter; a Headphones card with a volume slider at -11.5 dB; and the Clean microphone card with noise and echo reduction on.
The Microphone tab.
Recording

Record video or audio, in the format you pick

  • MP4 (H.264 + AAC)
  • MKV (H.264 + Opus)
  • WebM (VP9 + Opus)
  • WAV
  • FLAC
  • MP3
  • Opus
  • M4A

Pick the sound source: the default input, the clean mic, a specific mic, or none. With the virtual camera on, recording uses a free output, so Meet and the preview keep working at the same time.

Through ffmpeg. Stopping, even with Ctrl+C, always closes the file properly.

emeetctl window, Record tab: Video and sound or Audio only, format buttons MP4, MKV and WebM with a hint about each, a Sound picker set to the system default input, a big Record button and the destination folder.
The Record tab.
Three ways to use it

GUI, CLI and MCP server

  • emeetctl-gui — the desktop app.
  • emeetctl — the CLI, with --json output for scripts.
  • emeetctl-mcp — an MCP server, so AI assistants (Claude Code and other MCP clients) can control the light, the image, the microphones and recording.
Safe by design

Only what the vendor app sends

emeetctl only ever sends the light commands observed in the vendor app. Any opcode that was not seen in the capture is refused.

Firmware updates are deliberately unsupported, and the Device tab says so.

emeetctl window, Device tab: product EMEET SmartCam S600L, serial number (blurred), firmware 1.0.19, light channel /dev/hidraw0, video /dev/video1, and the virtual camera card: on, sending to three outputs (emeetctl Camera, Camera 2, Camera 3), all free.
The Device tab, with the virtual camera.

Download

Linux, x86_64. Pick the package that matches your distro.

Recommended

.deb package

Ubuntu 24.04+, Debian 13+, Linux Mint 22+, Pop!_OS 24.04+

Installs the udev rule automatically, so the light works without sudo. File: emeetctl_<version>-1_amd64.deb

$ sudo apt install ./emeetctl_0.1.0-1_amd64.deb
Latest release
Any distro

Binary tarball

Any distro with glibc 2.39+

emeetctl-0.1.0-x86_64-linux.tar.gz

Needs the udev rule step done manually.

Latest release
Rust 1.81+

From source

$ git clone https://github.com/NicholasWM/emeetctl
$ cd emeetctl
$ cargo install --path crates/emeetctl-gui
$ cargo install --path crates/emeetctl-cli
$ cargo install --path crates/emeetctl-mcp

Then do the udev rule step.

udev rule (tarball and source installs)

The light is driven through /dev/hidraw. This rule lets your user talk to it without root.

$ sudo cp udev/70-emeetctl.rules /etc/udev/rules.d/
$ sudo udevadm control --reload
$ sudo udevadm trigger --subsystem-match=hidraw --action=change

Coming later

  • AppImage
  • AUR
  • Flatpak

Flatpak is the hard one: its sandbox cannot install the hidraw udev rule the light depends on.

CLI quick tour

Same controls as the GUI, scriptable. Add --json for machine-readable output.

$ emeetctl status
$ emeetctl color 123456
$ emeetctl rainbow
$ emeetctl mode warm
$ emeetctl brightness 30
$ emeetctl off rgb
$ emeetctl image set zoom_absolute 200
$ emeetctl image reset
$ emeetctl --json status

MCP server

Let your AI assistant drive the camera. Register it once with Claude Code, or with any other MCP client.

$ claude mcp add emeetctl -- emeetctl-mcp
  • get_statuslight state and device info
  • set_light_powerfill light / RGB ring on-off
  • set_light_colorany RGB color
  • set_light_modelight mode
  • set_light_brightnesslight brightness
  • list_image_controlsavailable image controls
  • set_image_controlset one image control
  • reset_image_controlsback to factory values

"turn my camera ring red while I'm in a meeting"plain language in, MCP tool calls out

FAQ and camera quirks

Things the hardware does that are worth knowing.

Zoom does nothing

The camera only applies digital zoom in MJPEG below 1080p. Measured frame by frame:

Zoom worksMJPEG 2560×1440, 1280×960, 1280×720, 1024×576, 960×720, 800×600, 640×480, 640×360
Zoom ignoredMJPEG 1920×1080, MJPEG 3840×2160, and every YUYV mode

EMEET's own FAQ also says the field of view is fixed at 4K and 1080p. Check which resolution your video app is using.

Permission denied on /dev/hidraw

Install the udev rule. The .deb package does this for you.

Other EMEET models?

Only the S600L (USB 328f:00ef) has been tested. Contributions with USB captures from other models are welcome on GitHub.

How was the protocol found?

By passive USB capture of EMEET Studio 2.0.4 (firmware 1.0.19). No decompilation.

The frame format:

090202OPLLLLLLLLdata

No checksum, with SET/GET pairs for power, color, brightness and mode. Full write-up in the README.