c9ed3f3b8d
Security fixes from a full audit of the project: - Phone: USB now connects through a local socket that only accepts the adb shell user, and the loopback exemption on the TCP port is gone. Other apps on the phone can no longer read the camera without the access code. - Phone: wrong access codes lock the sender out for a minute after five tries. Codes are compared in constant time, request lines and concurrent connections are capped. - Phone: a scanned QR code is only accepted when it points at a trycloudflare.com address. - PC: the preview server checks the Host header and requires a per-launch token, which closes DNS rebinding from web pages. - PC: automatic updates verify the download against a SHA-256 published in version.json and refuse to install without one. - PC: remote mode counts failed attempts per source, caps handshakes and message size, so a stranger can no longer lock the real phone out. - PC: older phones keep working over USB by falling back to the TCP forward. Also adds a What's new window on both platforms after an update.
FlexCam
Turn your phone into a PC webcam — over USB, WiFi, or from anywhere.
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What it is
FlexCam streams your Android phone's camera to your PC and exposes it as a virtual webcam, so any app (Zoom, Teams, Discord, your browser, OBS) can pick it as a camera. It works over USB (via ADB) and WiFi, switching between them automatically if one drops, and can also connect from any network — including mobile data — with the experimental remote mode.
- Hybrid USB + WiFi with automatic failover
- Auto-connects when your phone is ready — no manual steps
- Live preview on both phone and PC
- Front / back camera switch, auto portrait/landscape
- Keeps streaming with the screen off
- WiFi access code — strangers on your network can't view the stream
- Remote mode (experimental) — use your phone from anywhere, even on mobile data, with no port forwarding and no account
- 10 languages, 6 themes, dark UI, tray support
- USB and WiFi run fully on your device
Virtual camera driver
FlexCam needs a virtual camera on the PC. You have two options:
- Bundled driver (no OBS needed): on first run, if no virtual camera is found, click "Install virtual camera" in the app. It registers a small open-source driver (Unity Capture, MIT) once, with a one-time admin prompt.
- OBS Studio: if you already have OBS, FlexCam uses its Virtual Camera automatically.
Quick start
- Phone: install
FlexCam.apkand open the app. - PC: unzip FlexCam-Windows.zip and run
FlexCam.exe.- First run: if prompted, click "Install virtual camera" (one-time).
- It auto-connects over USB. For WiFi, type the phone's IP and the access code shown in the app.
- In your video app, pick the camera named "FlexCam" (or "OBS Virtual Camera" if you rely on OBS instead).
USB needs USB debugging enabled (Developer Options). WiFi needs no cable.
Remote connection (experimental)
Remote mode lets the phone reach your PC from any network — a different WiFi, a friend's house, or mobile data. There is nothing to configure: no port forwarding, no router settings, no account.
- On the PC, open Remote connection and pick a quality preset.
- FlexCam opens a temporary tunnel and shows a QR code.
- On the phone, tap Connect remotely → Scan QR code.
The phone then streams to your PC and the virtual camera works as usual.
What you should know:
- Video is relayed through Cloudflare, which terminates TLS and can technically see it. USB and WiFi modes do not do this.
- The tunnel uses Cloudflare Quick Tunnels, which Cloudflare documents as intended for testing and development, with no uptime guarantee. That is why the feature is marked experimental.
- Expect higher latency than on a local network, and real mobile data use — the quality presets show an estimate per hour.
- Each session generates a new address and a new 128-bit secret. The secret is never sent over the wire, and repeated wrong attempts shut the listener down.
- Remote mode is off by default and stops when you close it.
Build from source
Android (APK):
cd android
gradlew assembleDebug
Requires JDK 17.
PC (desktop app):
cd pc
python -m venv .venv
.venv\Scripts\python -m pip install -r requirements.txt
.venv\Scripts\python webgui.py
Package a standalone .exe with PyInstaller (onedir):
.venv\Scripts\python -m PyInstaller --noconfirm --onedir --windowed --name FlexCam ^
--add-data "web;web" --add-data "flexcam-logo.png;." --add-data "FlexCam.apk;." ^
--add-data "adb;adb" --add-data "virtualcam;virtualcam" ^
--collect-all pyvirtualcam --collect-all pystray --collect-all webview ^
--collect-all pythonnet --collect-all clr_loader --collect-all pypresence webgui.py
Tech
- Android: Kotlin, CameraX, an MJPEG server on port
8474. - PC: Python, pywebview UI,
pyvirtualcam→ OBS or Unity Capture. - Transport: raw TCP over
adb forward(USB) or the phone's IP (WiFi).
Privacy
USB and local WiFi keep everything on your own devices — the video never leaves your machine or your network.
Remote mode is the exception: it routes video through Cloudflare's network by design, because that is what makes a connection possible without opening ports. It is off unless you turn it on.
License
FlexCam's own source code is MIT — see LICENSE.
The prebuilt Windows download bundles pyvirtualcam (GPL-2.0), so that build is distributed under the GPL-2.0 as a whole. See THIRD-PARTY-NOTICES.md for the full list.