IETF MOQ WG: Top Tracks and SSTS (or ABR in general)
Ian Swett posted to the MOQ working group mailing list on July 27, 2026. I reviewed the most recent Top Tracks PR, and I continue to wonder exactly how it will work with SSTS (or another ABR algorithm). At a high level,…
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moq@ietf.org - Thread subject: Top Tracks and SSTS (or ABR in general)
- Message subject: [Moq] Top Tracks and SSTS (or ABR in general)
- Author: Ian Swett
- Published: 2026-07-27T20:10:09.000Z
- Source tag:
ietf-mailing-list - Message URL: Open in IETF Mail Archive
Summary
Ian Swett posted to the MOQ working group mailing list on July 27, 2026. I reviewed the most recent Top Tracks PR, and I continue to wonder exactly how it will work with SSTS (or another ABR algorithm). At a high level,…
Why It Matters
This message came from the public MOQ working group archive and captures active discussion, meeting coordination, or implementation feedback around Media over QUIC.
Message Excerpt
I reviewed the most recent Top Tracks PR, and I continue to wonder exactly how it will work with SSTS (or another ABR algorithm). At a high level, I believe I know what one might want, but the mechanisms
Plain-Text Body
I reviewed the most recent Top Tracks PR, and I continue to wonder exactly how it will work with SSTS (or another ABR algorithm).
At a high level, I believe I know what one might want, but the mechanisms to achieve it are unclear to me.
I realize there are use cases for Top Tracks without ABR, but for the VC usecase, ABR seems essential?
Specific questions:
- How do you send the correct SUBSCRIBE_TRACKS initially? Do you use a Track Property Filter to filter for the ideal resolution, and combine that with Top Tracks?
- How do you ensure the focal viewport gets higher priority when deciding which video feed to downswitch?
- If a client pins a video feed other than the VC's default, how does prioritization work?
- Are there any demos of Top Tracks and SSTS working together, even if it's a simulation and not the public internet?
I asked the Meet team to describe what they do today. That may or may not be proprietary, but it doesn't matter because it's sufficiently complex that I can't summarize it anyway. I'm sure it's complex for very good reasons, but it doesn't give me confidence we'll design a comparable solution in MoQ soon.
Ian