CELLAR -- Sep 23 2025 1900 UTC

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Agenda / Notes

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👥 Participants (please add yourself as you join)

• Robert Sparks
• Spencer Dawkins
• Steve Lhomme
• Jérôme Martinez
• Dave Rice

Regrets:

📣 Note Well

https://www.ietf.org/about/note-well/
Please be KIND to each other.

👀 Previous meeting minutes

Are any corrections needed to the August interim minutes?

• No corrections, so official

🔥 Hot Topics

🗣️ Working Group Documents

See https://datatracker.ietf.org/group/cellar/documents/

draft-ietf-cellar-tags

• Spencer has nudged Orie to take a look at -19, which should address
  Orie's AD Evaluation comments.
• Next step is Last Call, for comments from other IETF participants.

draft-ietf-cellar-codec

• Spencer issued a three-week WGLC for the -15 version.
• Spencer doesn't see any comments on our mailing list, and doesn't
  see any new issues in Github for this specification.
• WGLC has ended (on 2025-09-16).
• Next step is for Spencer to do a shepherd writeup and request
  publication. Spencer is chasing nits and is verifying availability
  of references.

draft-ietf-cellar-ffv1-v4

• Our last few meeting minutes have said "The draft is waiting for
  implementation experience and feedback. We still expect to request
  publication in 2025."
• If we expect to complete WGLC before year end (which realistically
  means "end of November at most"), what do we need to do before WGLC?
• We're thinking March 2026. We want to publish v4 before it's already
  in the wild (that was a problem with v3)
• The draft is expired, but we'll wait to submit an updated version
  until we have something to revise in the draft.
• v4 is already in ffmpeg experimental code now, so we don't want to
  wait too long.
• We need to compare source code with the specification, and then
  Spencer can review the specification.

🛸 Any Other Business

• Matroska v5 is likely to have an initial draft in the next few
  months.

• We discussed
  https://github.com/ietf-wg-cellar/matroska-specification/pull/1026
  and concluded that what was needed could be done with the tag system
  instead. Dave asked if we needed to say more in tags to cover cases
  like this one, recommending tag names and a vocabulary for the
  values. Jérôme will capture the conversation in an update to the PR.

• Spencer and Robert should propose 2026 meeting dates (soon).

Additional Information

Planned future meeting dates

• 2025-10-14
• 2025-12-09