Re: [AVTCORE] I-D Action: draft-ietf-payload-vp9-11.txt

Christer Holmberg <christer.holmberg@ericsson.com> Thu, 04 February 2021 18:48 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Jonathan Lennox <jonathan.lennox@8x8.com>, Justin Uberti <justin@uberti.name>
CC: IETF AVTCore WG <avt@ietf.org>
Thread-Topic: [AVTCORE] I-D Action: draft-ietf-payload-vp9-11.txt
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Date: Thu, 04 Feb 2021 18:48:29 +0000
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Subject: Re: [AVTCORE] I-D Action: draft-ietf-payload-vp9-11.txt
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Hi Jonathan,

>>> Q3:
>> 
>> Is there a reason why profile-id is optional, since a value will always be assumed?
>
> Since profile-id negotiation was developed relatively late in the process of writing the spec, existing implementations don’t always send it.  It seemed best to maintain compatibility here.

Ok. Perhaps it would be useful to add a note indicating that?

>> Q2:
>> 
>> In Section 6.2.1, my understanding is that max-fs and max-fr are optional. Section 6.2.2 says that the answerer must maintain all configuration parameters. Does that apply to max-fs and max-fr too? If so, if the offer does not contain max-fs and max-fr, the answer cannot contain them either?

A little more on this: the draft says that max-fs and max-fr are only used to indicate capabilities. AFAIU, it is not used to negotiate anything, so I see no reason why endpoints would not be able to insert different values.

Also, Section 6.2.1 of the draft says:

   "The parameters "max-fs", and "max-fr", MUST be included in the
     "a=fmtp" line of SDP if SDP is used to declare receiver capabilities."

The "if SDP is used to declare receiver capabilities" sounds strange. Do you mean to say "MUST be included if the user wants to declare its receiver capabilities"?

Also, there is no text on what an endpoint does when receiving those values by the peer. I assume the user should not exceed the indicated frame rate/size, but that is not specified anywhere.

Regards,

Christer