Discussions - March 2026 (IETF 125 Shenzhen)

March 2026 was dominated by IETF 125 in Shenzhen and the resulting hackathon/interop activity.

IETF 125 Shenzhen (Week of Mar 14-18)

Hackathon Interop

Major interop testing during the IETF hackathon:

• moq-rs (Cloudflare) provided multiple relay endpoints for testing
• xquic-moq (Alibaba) passed all interop runner tests
• moxygen (Meta) relay available at usual endpoints
• 10+ implementations registered in interop-runner

MOQ Dinner

will-law organized a MOQ dinner on Thursday evening at a local restaurant, guided by Giovanni Marzot’s wife.

AI Minutes

Magnus Westerlund announced that EKR’s AI minute tool now does Meetecho virtual interims. MOQ AI minutes available at: https://ietfminutes.org/minutes/wg/moq.html

Slack moq Key Discussions

SUBSCRIBE_NAMESPACE Split (Mar 31)

alan-frindell announced the split of SUBSCRIBE_NAMESPACE into two messages:

• SUBSCRIBE_NAMESPACE - gets namespace information (NAMESPACE/DONE)
• SUBSCRIBE_TRACKS - gets PUBLISH notifications Overlaps not permitted among same type, but permitted across types. Can use REQUEST_UPDATE to modify prefix.

QMux Design (Mar 15)

Significant discussion about qmux ALPN negotiation:

• luke-curley: qmux-00.moqt-16 syntax, noting qmux-01 would double permutations
• alan-frindell: “I sort of think the right answer is to use moqt-16, and define that TLS+TCP moqt-16 ⇒ qmux-00”
• Joseph Beshay set up QMux relay at fb.mvfst.net:9449

Track Properties Confusion (Mar 18)

lorenzo-miniero raised parsing confusion about Track Properties in request messages (no explicit length prefix). Generated a 20-reply thread that led to spec clarification. See track-properties.

Draft-17 Interop Testing (Mar 17-23)

luke-curley released initial draft-17 support in moq-dev - 74 replies in the thread. Daiki Matsui tested against cdn.moq.dev/anon and reported several questions about relay behavior:

1. Relay sends SUBSCRIBE_NAMESPACE back after PUBLISH_NAMESPACE
2. DOES_NOT_EXIST reply causes session drop
3. Relay keeps sending PUBLISH_NAMESPACE for other namespaces

New Implementations Announced

• suhas-nandakumar: Go bindings for QuicR - quicr-go (Mar 25)
• Giovanni Marzot: Python aiomoqt up to draft-14, draft-16 in progress (Mar 23)
• Giovanni Marzot: Python aiopquic bindings to picoquic (Mar 23)

CMAF Compression Proposal (Mar 18)

luke-curley proposed draft-lcurley-compressed-mp4-00 to bridge LOC and CMAF. See media-packaging.

qlog for MOQ (Mar 18)

Lucas Pardue updated his PR to quiche for MOQ qlog support: cloudflare/quiche#1960. Aligns with draft-pardue-moq-qlog-moq-events-06, targeting draft-16. Includes qlog-dancer for text/HTML reports and wirefilter-based semantic filtering.

0-RTT Subscribe (Mar 16)

alan-frindell: “I don’t support all of draft-17, but I did get 16 + uni control streams to do a true 0-RTT subscribe”

Issue Milestone (Mar 15)

alan-frindell: “There are now fewer than 100 open issues in the moq-transport repo.”

Shaka Player v5.0.5 Update (Mar 11)

Daiki Matsui announced Shaka Player’s MOQT support updated from draft-11 to draft-14. See shaka-player.

Luke Curley Blog Post (Mar 10)

luke-curley published a blog post about a security camera use case: On a Boat

New Varint Encoding Bugs (Mar 3)

lorenzo-miniero found issues with the new MoQ varint examples in draft-17. alan-frindell confirmed example 4 has a bug (0xdd7f3e7d should decode to 1,933,118, not 494,878,333). Alan shared a Python reference implementation and validated it with Claude. Lorenzo confirmed only the 0xdd7f3e7d example was broken.

Mailing List Highlights

Consensus Call on draft-17 (Mar 24)

martin-duke initiated a consensus call on draft-17 changes. Thread received responses through April 10.

The 7-Byte MOQT Varint Encoding (Mar 19 → Apr 7)

Major mailing list thread about the new varint encoding format. Participants: alan-frindell, martin-duke, suhas-nandakumar, Ian Swett, Mo Zanaty, Christian Huitema. Debated whether to allow the previously-invalid 7-byte encoding. Result: PR #1595 allowing 7-byte varints and non-minimal encodings.

MoQ Charter and QMUX (Mar 20-23)

Magnus Westerlund, Lucas Pardue, luke-curley, and suhas-nandakumar discussed whether qmux fits within MOQ’s charter scope.

Presence/Notifications Protocol (Mar 30)

Phillip Hallam-Baker posted about presence/notifications protocol design for MOQ.

MOQPACK Compression (Mar 20)

alan-frindell commented on MOQPACK (QPACK-like compression for MOQT).

Draft Minutes for IETF 125 (Mar 23)

Magnus Westerlund posted draft minutes for the MOQ sessions at IETF 125 Shenzhen.

LOC-02 Published (Mar 15)

I-D Action announcement: draft-ietf-moq-loc-02.txt published.

Key Themes

1. IETF 125 hackathon drove significant interop progress
2. QMux emerged as important for Safari/TCP fallback
3. Wire format details (properties, encoding, varint) consumed significant discussion
4. New implementations joining the ecosystem (Go, Python)
5. Tooling improving (qlog, interop runner, AI minutes)
6. Consensus process - draft-17 consensus call initiated