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[AVTCORE] Comments on draft-he-avtcore-rtcp-green-metadata

Jonathan Lennox <jonathan.lennox@8x8.com> Thu, 21 July 2022 21:39 UTC

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From: Jonathan Lennox <jonathan.lennox@8x8.com>
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Date: Thu, 21 Jul 2022 17:39:20 -0400
Cc: draft-he-avtcore-rtcp-green-metadata@ietf.org
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Subject: [AVTCORE] Comments on draft-he-avtcore-rtcp-green-metadata
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Hi - I read over draft-he-avtcore-rtcp-green-metadata in advance of the IETF meeting.

Some comments as an individual:

My first question is whether there is a freely-available (non-paywalled) version of the [GreenMetadata] spec?

In the absence of this, it is somewhat difficult to completely understand the semantics of the TSRR message as this document is currently written, so it might be useful to specify the semantics in full in this document, and cite [GreenMetadata] only informatively.

That said, I infer that the message's intended semantic is “this is the maximum resolution/frame rate I am interested in displaying at this time”.  Is this correct?  If so this seems like a useful semantic, and I can see how it could be used to save both energy and other resources.

A few more minor comments as an individual:

The FMT values you chose for your message are already assigned - please see https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml#rtp-parameters-9 <https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml#rtp-parameters-9> for the list of the currently-assigned values.  The next two free values are 11 and 12.  (There’s no need to repeat the assignments from RFC 4585 or 5104 in your document.)

The ability to specify a resolution or frame rate of 0, meaning “no video bitstream is requested”, seems to overlap in semantics with the PAUSE/RESUME semantics defined in RFC 7728, and also with various higher-level ways of turning video on and off; rather than have to specify how these mechanisms interact, it might be better for this specification to forbid values of 0.

Finally, the URL in the reference for [GreenMetadata] points to the ISO standard "ISO 5834-1:2019: Implants for surgery — Ultra-high-molecular-weight polyethylene — Part 1: Powder form”, which I suppose is indicative of the broad range of topics that ISO standardizes.  I suspect you instead meant to point at https://www.iso.org/standard/83674.html <https://www.iso.org/standard/83674.html>.


As a chair, my question is the usual one: if we standardized this, is there a community that would be interested in implementing and using it?

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