moq-wasm

What is moq-wasm?

Real-time communication of any data for web browsers, native apps, IP cameras, USB cameras, robots, drones and AI agents. One publish/subscribe API with a simple architecture, high-performance QUIC transport, priority control and caching, so you no longer have to pick between WebSocket, MQTT, HLS, DASH and WebRTC for each use case.

Implements Media over QUIC Transport draft-ietf-moq-transport-14 in Rust (drafts in docs/spec/).

Use cases and demos

Try the demos hosted at https://nttcom.github.io/moq-wasm/. They connect to the cloud relay by default, so nothing needs to be installed.

Use case	Demo
Video meetings	Meeting
Large-scale live streaming	Live Viewer: live playback with rewind and rendition switching
Video on demand	Live Viewer: publish an MP4 from the browser
Remote monitoring and control of IP cameras	ONVIF: PTZ control and monitoring
Remote monitoring from USB cameras	Remote Monitoring
Real-time chat moderation by an AI agent	MoQ Chat Moderation
Real-time video analysis by an AI agent	MoQ Camera Detection: answers questions about a camera feed
Camera control by an AI agent	MoQ PTZ Tracking: pans and tilts an ONVIF camera to keep a target centered
Remote monitoring, data collection and control of drones
Remote monitoring, data collection and control of robots
Remote monitoring, data collection and control of autonomous vehicles

Publishers outside the browser: crates/live-ingest (RTMP/SRT), crates/gst-plugin-moqt (moqtsink), examples/rust/moq-cli and the pipecat bots. Details of every browser demo are in examples/browser/README.md.

Getting Started

nix develop
npm --prefix examples/browser ci

Single relay

Run a relay, publish a test stream and watch it, in four terminals:

make relay          # 1. relay and a local VTS on https://127.0.0.1:4433
make live-ingest    # 2. RTMP/SRT ingest publishing to the relay
make ffmpeg-srt     # 3. test pattern over SRT into the ingest
make browser        # 4. wasm build and the example hub on http://localhost:5173

Then make chrome (make chrome:linux on Linux) opens Chrome trusting the relay's self-signed certificate. Open Live Viewer from the hub and watch anon/live/test.

Two relays

docker compose up -d

Starts relay-a (https://127.0.0.1:4433) and relay-b (:4434) sharing a VTS and a Redis route registry, the topology the cascading, auth and meeting E2E use. The make targets above publish to relay-a and resolve the Docker Desktop bridge host for native clients on macOS.

Tests

make test                        # Rust unit tests
make browser-e2e-media           # browser publish/subscribe
./tests/auth-e2e/run.sh            # relay scenarios, see tests/README.md
cargo test -p vts                # VTS

Architecture

flowchart LR
    subgraph Publishers
        B1[Browser<br/>wasm]
        LI[live-ingest<br/>RTMP / SRT]
        GS[moqtsink<br/>GStreamer]
        ON[onvif bridge]
        CLI[moq-cli]
    end
    subgraph Relays
        RA[relay-a] <--> RB[relay-b]
        VTS[VTS<br/>JWT verification]
        RA -.-> VTS
        RB -.-> VTS
    end
    subgraph Subscribers
        B2[Browser<br/>Live Viewer, Meeting, ...]
        BOT[AI agents<br/>pipecat bots]
        CLI2[moq-cli]
    end
    Publishers -- PUBLISH / SUBSCRIBE / FETCH<br/>QUIC or WebTransport --> RA
    RB --> Subscribers

Every client speaks MoQT to a relay over QUIC or WebTransport. Relays cache objects for FETCH, forward subscriptions to each other and authenticate sessions through the VTS. The moqt crate is the protocol library every other component builds on. Every Rust crate lives in crates/<package name>/.

Path	Component
crates/moqt/	Protocol library: wire format, sessions, publisher and subscriber API
crates/relay/	Relay: QUIC and WebTransport on one port, cache, FETCH, cascading, JWT auth
crates/wasm/	WebAssembly bindings used by the browser examples
crates/gst-plugin-moqt/	GStreamer plugin with the moqtsink element
crates/live-ingest/	RTMP and SRT ingest into MoQT
crates/onvif-ingest/	ONVIF/RTSP cameras with PTZ control into MoQT
crates/mediapack/, msf/, broadcast/, transcode/	Media crates shared by the publishers: containers, MSF catalog, the broadcast's track layout, re-encoding
,

Architecture documents: moqt, relay, broadcast, Live Player. Contributor rules: AGENTS.md.

Authentication

Relays always authenticate. A session without a token is limited to anon/**, which every demo uses by default. Tokens are HS256 JWTs verified by the VTS; sign one with the auth-token CLI (crates/auth-token/README.md). See crates/vts/README.md.