Language: Go
Upstream: mengelbart/moqtransport — MIT, ~87 stars, Mathis Engelbart (TUM)
Fork: Eyevinn/moqtransport — Eyevinn’s downstream
Built on: quic-go + webtransport-go
Overview
The principal Go MOQ Transport library, and the upstream from which several Go-based MoQ efforts derive. Written by Mathis Engelbart, who is also active in the WG on moq-transport encoding issues and the mlog/qlog event-definition work.
This page covers both the upstream and the Eyevinn fork, because the wiki’s Eyevinn-centric coverage previously referenced only the fork:
Upstream mengelbart/moqtransport | Fork Eyevinn/moqtransport | |
|---|---|---|
| Author | Mathis Engelbart (TUM) | Eyevinn (see tobbe-einarsson) |
| Created | — | 2025-11-23 |
| Stars | ~87 | ~5 |
| Interop runner | registered (as moqtransport, draft-13) | not registered |
| Draft support | README draft-11 / runner draft-13 | draft-18 (v0.11.0, 2026-08-30; v0.11.1, 2026-08-31; v0.12.0, 2026-09-01; v0.13.0, 2026-09-02) |
The upstream is the registry-registered one and roughly 17× larger by stars; the README still advertises draft-11 while the runner entry says draft-13, so its draft support is behind the rest of the ecosystem and it is not a current interop contender. The Eyevinn fork jumped ahead of the upstream on 2026-08-30, shipping a full draft-18 rewrite as v0.11.0 (see Recent activity) — the first time the fork’s draft support has diverged materially from mengelbart/moqtransport.
Recent activity
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v0.14.0 “§7.2 stream tiering” (tagged 2026-09-29): PR #26 (tobbee, +177/−57, merged Sep-21) bumps quic-go to v0.62.0, whose RFC 9218-style stream priorities make the library’s priority mapping live for the first time. It applies draft-18 §7.2’s tiering as QUIC urgency: control streams 0, bidi request streams 1, Objects 2–5 (by the top two bits of the priority number), 6 spare, 7 padding. It also fixes a real inversion: the control stream had kept quic-go’s default urgency 3, so any subscription with priority below 96 overtook it. The practical consequence is that two priorities must now differ by at least 64 to be separated. Go 1.26 is now required. moqlivemock v0.16.0 consumes it to schedule catalog/audio/subtitles ahead of video.
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v0.13.0 “RENDEZVOUS_TIMEOUT on SUBSCRIBE” (tagged 2026-09-02) — PR #25 (+83/−0) exposes the draft-18 §10.2.6 RENDEZVOUS_TIMEOUT parameter (wire codepoint
0x04, a varint of milliseconds) that the wire layer already knew but nothing surfaced:Parameters.RendezvousTimeout()/SubscribeRequest.RendezvousTimeout()return the wait plus whether it was present (absent and zero get different answers from a relay — DOES_NOT_EXIST vs. an expired hold), andWithRendezvousTimeout(d)sets it on a SUBSCRIBE. Driven by moqlivemock’smlmrel, whose blanket hold on every SUBSCRIBE contradicted the section’s MUST (moqlivemock #139); also needed by any client wanting the runner’s proposedpublish-to-pending-subscriptiontest (interop-runner #103, which sends 5000 ms). -
v0.12.0 “receive-side fixes for relays” (tagged 2026-09-01) — PR #23 “receive side: complete delivery, surface subgroup ends” (+488/−59) plus PR #24 running the session suite under Go’s
testing/synctest. Hardens the library’s relay/receive path — the same day moqlivemock added its ownmlmrelrelay component built on this library. -
v0.11.1 “qlog payload cap” (tagged 2026-08-31) — a small follow-up to the draft-18 rewrite, capping qlog payload sizes; consumed the same day by moqlivemock (#133) as it cut its v0.14.0 tag.
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PR #18 “Rewrite for MoQ Transport draft-18” (tobbee, merged 2026-08-30, +16,989/−13,359) → v0.11.0 “draft-18 rewrite” (tagged 2026-08-30) — a large rewrite migrating the Eyevinn fork from draft-14/16 to moq-transport draft-18, done alongside the parallel moqlivemock draft-18 migration (moqlivemock #129) ahead of the Sep-2 draft-18 interop hackathon. The migration surfaced a §11.4.4.2 End-of-Range clarity question — moq-transport #1861 — which afrind then closed as “agentic output” (Aug-31), part of a WG crackdown on AI-generated issues (see moq-transport open questions).
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PR #16 “Eyevinn fixes” (@paulharter, +169/−15, merged 2026-08-28) with follow-up PR #17 (tobbee, +34/−3, merged 2026-08-28, documenting delivery semantics + guarding against goroutine leaks) — three fixes cherry-picked from
panaudia/moqtransport, a further-downstream fork used by LASA (live spatial audio over MoQ):- Backpressure for stream-read objects — subgroup and fetch objects shared the same drop-on-overflow channel as datagrams, so reliable stream data could be silently lost. The most substantive of the three.
- Expose the publisher-assigned track alias on
RemoteTrack. - Atomic subgroup handling.
This is the first sign of a third-tier fork chain (upstream → Eyevinn → panaudia) feeding fixes back upward, and the first MoQ spatial-audio application the wiki has recorded.
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Companion
mengelbart/gst-moq-app(Go GStreamer demo) has been stale since 2024.
Related
- mathis-engelbart, moqlivemock, tobbe-einarsson
- moq-go — the other significant Go MOQT implementation, at draft-19
- Implementations Overview, interop-runner