Media over QUIC (MoQ) is a live media delivery protocol utilizing QUIC streams. See the MoQ working group for more information.

This repository provides a web library for MoQ. It uses browser APIs such as WebTransport and WebCodecs to support both contribution and distribution over MoQ.

Note: This library currently focuses on the client side. You’ll need a MoQ server or relay, such as moq-rs (for local usage).

This library offers two main approaches to playing MoQ streams in a browser:

1. Web Component – <video-moq> with simple built-in controls.
2. Simple Player – A Player class that handles rendering and playback logic without built-in UI.

Install the library from npm:

npm install @moq-js/player

Or include via a <script> tag (for the IIFE build):

<script src="https://cdn.jsdelivr.net/npm/@moq-js/player@latest/dist/moq-player.iife.js"></script>

<video-moq
	src="https://example.com/my-moq-stream?namespace=demo"
	fingerprint="https://example.com/fingerprint"
	width="640"
	muted
	controls
></video-moq>

The built-in controls are basic. If you want more advanced controls or custom styling, see the Styling & Media Chrome section or our samples.

If you’d prefer to implement your own UI or integrate the player logic differently, use the class-based Player:

import { Player } from "moq-player";

async function initPlayer() {
	const canvas = document.getElementById("my-canvas");
	const player = await Player.create({
		url: "https://example.com/my-moq-stream",
		fingerprint: "https://example.com/fingerprint",
		namespace: "demo",
		canvas,
	});

	player.play();
	// Implement your own play/pause buttons, volume sliders, etc.
}

Both the Web Component and the Class-Based Player emit a series of events to help track playback state:

• play
• pause
• loadeddata
• volumechange
• unsubscribestared
• unsubscribedone
• subscribestared
• subscribedone
• waitingforkeyframe
• timeupdate

You can listen to these events in the usual way. For example:

const videoMoq = document.querySelector("video-moq");
videoMoq.addEventListener("play", () => {
	console.log("Playback started!");
});

See samples/event-handling for complete examples.

When using the <video-moq> element, you can style it in various ways:

• Media Chrome: Integrate <video-moq> inside a <media-controller> and use <media-play-button>, <media-time-range>, and other controls. See samples/media-chrome for an example.

<script type="module" src="https://cdn.jsdelivr.net/npm/media-chrome@4/+esm"></script>
<media-controller>
	<video-moq slot="media" src="..." controls></video-moq>
	<media-play-button></media-play-button>
	<media-mute-button></media-mute-button>

	<!-- more controls... -->
</media-controller>

• player.style: You can also use custom themes from player.style to style the player. See samples/media-chrome for a working example.

<script type="module" src="https://cdn.jsdelivr.net/npm/player.style/x-mas/+esm"></script>
<media-theme-x-mas>
	<video-moq
		src="https://localhost:4443?namespace=bbb"
		fingerprint="https://localhost:4443/fingerprint"
		width="640px"
		slot="media"
	></video-moq>
</media-theme-x-mas>

The samples/ directory demonstrates:

• Web Component Basic – A simple <video-moq> usage.
• Web Component Advanced – Using the component as an ES module.
• Media Chrome – Integrating <video-moq> with player.style custom themes.
• Simple Player – Using the class-based Player without built-in controls.
• Event Handling – Listening for playback and subscription events in detail.

• Install dependencies

npm install

• Run the dev server for local testing:

npm run dev

Open localhost:3000 in a browser to see the samples running.

Licensed under either:

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

• Join our Discord for updates and discussion.
• File issues or suggestions via GitHub Issues.
• Pull requests are welcome!