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CLUE definitions. Stephan Wenger. Document Usefulness. Clue definitions was intended as working tool to align various CLUE drafts Alignment more or less reached Doc never intended for publication Is there a point in maintaining the doc beyond IETF81?

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Clue definitions

CLUE definitions

Stephan Wenger


Document usefulness
Document Usefulness

  • Clue definitions was intended as working tool to align various CLUE drafts

  • Alignment more or less reached

  • Doc never intended for publication

  • Is there a point in maintaining the doc beyond IETF81?

  • Suggestion: only one more update cycle right after this meeting.


Open issue 1 left right
Open issue #1: left/right

  • Definitions-00 used “stage-left” and “stage right”

    • Was too confusing for some, to restricting for others, and generally unintuitive

  • Definitions-01 says “to be interpreted in context”

    • No one objected so far, but I note that neither requirements nor framework provide sufficient context in all cases

  • Suggestion

    • Leave definition as in 01

    • Beat up document editors to be less sloppy


Open issue 2 layout
Open issue #2: “Layout”

  • Layout: How rendered media streams are spatially arranged with respect to each other on a single screen/mono audio telepresence endpoint, and how rendered media streams are arranged with respect to each other on a multiple screen/loudspeaker telepresenceendpoint. Note that audio as well as video is encompassed by the term layout--in other words, included is the placement of audio streams on loudspeakers as well as video streams on video screens.

  • Edit. note: this is on the RENDERER side ONLY.

  • Could encompass stuff like binaural

  • Is renderer-only definition agreeable


Open issue 3 mcu
Open Issue #3: “MCU”

  • MCU: Multipoint Control Unit (MCU) - a device that connects two or more endpoints together into one single multimedia conference [RFC5117]. An MCU includes an [RFC4353] Mixer.

  • RFC4353 is tardy in requiring that media from the mixer be sent to EACH participant. I think we have practical use cases where this is not the case. Is this an issue?

  • Suggestion: non-issue, leave “as is”


Open issue 4 media
Open Issue #4: “Media”

  • Media: Any data that, after suitable encoding, can be conveyed over RTP, including audio, video or timed text.

  • Edt. note: does Media include far end camera control (which can be conveyed over RTP)?

  • Suggestion: abstract definition is good enough, FECC is a special case (not architecturally sound anyway), so leave definition as is, and don’t mention FECC