HUBCAM NDI

iOS NDI camera transmitter with browser-based studio control.

HubCam NDI turns an iPhone into a fixed-lens NDI® video source controlled entirely over HTTP from any computer browser.

Designed for tripod and ceiling rigs where the phone screen stays off, digital zoom is disabled, and camera parameters (shutter, ISO, Kelvin white balance, focus distance, and tally color) are operated remotely.

STREAM PROTOCOLNDI® 6 (SpeedHQ)
REMOTE INTERFACEHTTP / JSON (:8080)
OPTICS0.5x / 1x / Tele / Front (1.0x Fixed)
PIXEL FORMATSNV12 4:2:0 / BGRA 32-bit
DISPLAY BLACKOUTOLED 1% + GPU Preview Off
TALLY / ID8-Color Screen Border Ring
RIG LOCKiOS Guided Access Compatible
01 / RIG CONFIGURATION

iOS Guided Access Setup

Prevents accidental exits, suppresses system notifications, and forces iOS to relaunch HubCam NDI automatically if interrupted during a shoot.

Part A — One-Time iOS Settings Configuration
01 Open Guided Access On the iPhone, open the system Settings app and navigate to:
Settings → Accessibility → Guided Access
02 Enable Master Switch Turn on the Guided Access toggle.
03 Configure Passcode & Face ID Open Passcode Settings, set a 6-digit passcode, and enable Face ID (or Touch ID) for fast unlocking at wrap.
04 Enable Triple-Click Shortcut Ensure Accessibility Shortcut is switched ON so triple-clicking the physical Side Button invokes Guided Access.
Part B — Locking the Camera on Set
01 Launch HubCam NDI Open HubCam NDI on the iPhone. Note: iOS hides the Guided Access option when you are on the Home Screen; an app must be open in the foreground.
02 Triple-Click Side Button Press the physical Side Button 3 times quickly and select Guided Access from the system sheet.
03 Disable Side Button & Touch Tap Options in the bottom-left corner of the Guided Access screen and turn OFF Side Button (Sleep/Wake) and Touch. This prevents anyone from accidentally locking the phone or touching the screen during a shoot, then tap Start (top right).
04 Confirm Status & Turn Off OLED Display In the web controller top bar, verify that the status readout shows Guided Access Active. Click IPHONE DISPLAY ON to switch it to IPHONE DISPLAY OFF so the OLED screen turns black (1% brightness, GPU preview disabled) while NDI continues streaming uninterrupted.
To exit Guided Access: Triple-click the Side Button, enter your passcode (or double-click the Side Button to authenticate with Face ID), and tap End in the upper-left corner.
02 / REMOTE OPERATION

Web Control Deck

No client software is required on your computer. Each iPhone serves its own control interface directly over the local network.

URL Connecting from Browser Tap HELP on the iPhone top bar to view the device IP and port (for example, http://192.168.1.45:8080). Open one browser tab per camera on your computer. The browser tab title automatically updates to match the NDI Source Name.
BW Zero Preview Overhead The web interface transmits only lightweight JSON state updates (~650ms polling) and never streams MJPEG/WebRTC video to the browser, preserving 100% of Wi-Fi airtime and thermal headroom for the NDI feed.
SC Scene Presets (1–4) Click Scene 1–Scene 4 to recall saved lens, focus, exposure, and white balance settings. Hold Shift + Click on any scene button to overwrite it with the current camera state.
03 / CAMERA SUBSYSTEMS

Technical Specifications

Hardware behavior and battery-consumption profile across capture modes.

OPTICAL LENS LOCK

Switches directly between physical AVCaptureDevice sensors (0.5x, 1x, Telephoto, Front) with videoZoomFactor fixed at 1.0. Digital crop zoom is disabled.

SHUTTER & ISO PRIORITY

Supports full Auto Exposure, full Manual Exposure, Shutter Priority (fixed shutter + Auto ISO), and ISO Priority (fixed ISO + Auto Shutter) with live EV target offset compensation.

KELVIN WHITE BALANCE

Continuous manual temperature control from 2500K to 10000K using chromaticity-to-device RGB gain conversion, plus instant 3200K, 4200K, 5600K, and 6500K presets.

COLOR RING IDENTIFICATION

8 assignable screen-border colors (Red, Green, Blue, Yellow, Orange, Purple, Cyan, Magenta, plus OFF). Renders above the blackout layer so camera ID remains visible when the display is off.

THERMAL TELEMETRY

Real-time thermal estimation in °C mapped across four states (Normal, Warm, Hot, Critical). Optional automatic thermal protection disables the local display if the chassis reaches Hot/Serious state.

BATTERY OPTIMIZATION

Defaults to NV12 4:2:0 hardware pixel buffers and muted audio capture. High-drain modes (4K, 50/60fps, BGRA, and Full SpeedHQ bandwidth) are explicitly labeled in the UI.