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Re: [AVTCORE] RFC 8888 clarification: What does "active" mean?

Zaheduzzaman Sarker <zahed.sarker.ietf@gmail.com> Thu, 11 April 2024 09:37 UTC

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From: Zaheduzzaman Sarker <zahed.sarker.ietf@gmail.com>
Date: Thu, 11 Apr 2024 11:36:44 +0200
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To: Harald Alvestrand <harald@alvestrand.no>
Cc: avt@ietf.org
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Subject: Re: [AVTCORE] RFC 8888 clarification: What does "active" mean?
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Hi Harald,

My interpretation with be interpretation 2 ( the 2nd on your bullet list).
Reasoning: if you have not seen any packet since last report then there is
nothing to send feedback on.

//Zahed

On Tue, Apr 9, 2024 at 2:20 PM Harald Alvestrand <harald@alvestrand.no>
wrote:

> In looking at RFC 8888, we found an interpretation problem:
>
> "RTCP Congestion Control Feedback Packets SHOULD include a report block
> for every active SSRC."
>
> Two easily inferrable interpretations for "active":
>
> - Packets have been seen, and no BYE or timeout has occured
> - Packets have been seen since the last report was sent
>
> Now, the size of the reporting packet is very sensitive to this
> interpretation - back-of-the-envelope says that packets according to the
> last interpretation can be 1/3 of the packets according to the first.
>
> So - which interpretation is intended here, and why?
>
> Harald
>
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