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

Harald Alvestrand <harald@alvestrand.no> Tue, 16 April 2024 10:44 UTC

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Date: Tue, 16 Apr 2024 12:44:32 +0200
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To: Zaheduzzaman Sarker <zahed.sarker.ietf@gmail.com>
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From: Harald Alvestrand <harald@alvestrand.no>
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Subject: Re: [AVTCORE] RFC 8888 clarification: What does "active" mean?
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Thanks to all who responded. I'll send a formal errata with the 
suggested fix (replace "active" with "SSRCs for which at least one 
packet has been received since the last report").

On 4/11/24 11:36, Zaheduzzaman Sarker wrote:
> 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 
> <mailto: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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