Voice, video, and text chat

Built-in voice, video, and text chat lets viewers in the same room talk to — and see — each other while watching your stream, with no communication stack to build. Configure from Project Settings → Communication.

Settings

Setting	Options	What it does
Text Chat	On / Off	Real-time message window.
Voice Chat	On / Off	Low-latency voice over WebRTC.
Video Chat	On / Off	Live camera feeds between viewers in the same room.
Chat UI Position	Left / Right	Side of the screen.
Chat UI Theme	Light / Dark	Match your branding.
Mute on Entry	On / Off	Auto-mute mics when users join.
Startup Behavior	On Session Begin / On App Trigger	When the chat UI appears.

The Chat UI settings (position, theme) apply whenever any of the three chat modes is enabled.

Video chat

With Video Chat on, viewers in the same room see each other’s camera feed alongside the stream — turn a shared session into a face-to-face walkthrough, sales demo, or design review without leaving the page. The browser asks each viewer for camera permission before their video starts.

Video Chat shows viewers to each other. It’s separate from the Camera toggle in the Input settings, which sends a viewer’s webcam into your Unreal application for the app itself to use.

If you embed the stream in an iframe, include camera (and microphone for voice) in the iframe’s allow attribute — see sharing and embedding.

Startup behavior

Option	Behavior
On Session Begin	Chat UI appears as soon as the stream starts. Streampixel auto-assigns a temporary name and avatar if you don’t provide one.
On App Trigger	Chat UI only appears when triggered from your Unreal app, iframe, or Web SDK. Use this when you want to set the user’s identity first.

Programmatic control

To start or stop chat at runtime — and pass a real display name, avatar, and room — set Startup Behavior to On App Trigger and send a JSON message from your Unreal app or frontend.

Connect

{
  "message": {
    "type": "comms",
    "value": {
      "name": "Alice",
      "pfpUrl": "https://example.com/avatar.jpg",
      "roomId": "room-123"
    }
  }
}

Field	Purpose
`name`	Display name shown in chat.
`pfpUrl`	Avatar URL shown next to messages.
`roomId`	Users with the same `roomId` see each other. Omit for one-room-per-project.

Disconnect

{
  "message": {
    "type": "comms",
    "value": "disconnect"
  }
}

Sending the message

From Unreal
From an iframe
From the Web SDK

Use the Send Pixel Streaming Response Blueprint node with the JSON as a string.

JSON must be exact — missing quotes or brackets break the parser.

Use iframe.contentWindow.postMessage(...). See stream control commands.

Account

Project

Project settings

Built-in features

Cloud builds

Runtime Asset Storage

Unreal Engine extras

Voice, video, and text chat

Settings

Video chat

Startup behavior

Programmatic control

Connect

Disconnect

Sending the message

​Settings

​Video chat

​Startup behavior

​Programmatic control

​Connect

​Disconnect

​Sending the message

Settings

Video chat

Startup behavior

Programmatic control

Connect

Disconnect

Sending the message