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Re: [AVTCORE] WGLC summary: "RTP Payload Format for Visual Volumetric Video-based Coding (V3C)": SDP example issues

Christer Holmberg <christer.holmberg@ericsson.com> Tue, 13 February 2024 17:10 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Bernard Aboba <bernard.aboba@gmail.com>, IETF AVTCore WG <avt@ietf.org>
Thread-Topic: [AVTCORE] WGLC summary: "RTP Payload Format for Visual Volumetric Video-based Coding (V3C)": SDP example issues
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Date: Tue, 13 Feb 2024 17:10:16 +0000
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Subject: Re: [AVTCORE] WGLC summary: "RTP Payload Format for Visual Volumetric Video-based Coding (V3C)": SDP example issues
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Hi,

I found a couple of SDP nits in the document.

Q1: In Section 9.2, there is an example with an SDP mid attribute, but no 
grouping:

    m=video 40000 RTP/AVP 96
    a=rtpmap:96 H265/90000
    a=fmtp:96 v3c-unit-header=KAAAAA==;
              v3c-parameter-set=AUH/AAAP/zwAAAAAACgIAtEAgQLAIAAUQBACWAM
              5QEDgQCAIAAAAABP8CzwAAAAAAAAAQAAAtAE/wLPAAAAAAAg=;
              v3c-atlas-data=YAEHgFA=,YgEAMAAAC/B0qcvv/Dbr/pTvb8oqfhC5J
              QVS9jn7kAQT/As9EFyrjRBcmxEQe+j5DuGbTT9mZmZAQAAAoA==
    a=mid:1

Q2: In Section 9.3, there is an example of an answer with grouping, but no SDP 
mid attributes:

    a=group:v3c 1 2 3 4
    m=video 50000 RTP/AVP 96
    a=rtpmap:96 H264/90000
    a=recvonly
    m=video 50002 RTP/AVP 97
    a=rtpmap:97 H265/90000
    a=recvonly
    m=video 50004 RTP/AVP 98
    a=rtpmap:98 H266/90000
    a=recvonly
    m=application 50006 RTP/AVP 96
    a=rtpmap:96 v3c/90000
    a=recvonly

Regards,

Christer


> -----Original Message-----
> From: avt <avt-bounces@ietf.org> On Behalf Of Bernard Aboba
> Sent: Tuesday, 13 February 2024 10.25
> To: IETF AVTCore WG <avt@ietf.org>
> Subject: [AVTCORE] WGLC summary: "RTP Payload Format for Visual
> Volumetric Video-based Coding (V3C)"
>
> The AVTCORE WG WGLC on "RTP Payload Format for Visual Volumetric
> Video-based Coding (V3C)" has concluded.
>
> The document is available for inspection here:
> https://datatracker.ietf.org/doc/html/draft-ietf-avtcore-rtp-v3c
>
> IPR statements relating to the document were submitted in 2022 and are
> available here:
> https://datatracker.ietf.org/ipr/search/?draft=draft-ietf-avtcore-rtp-
> v3c&rfc=&doctitle=&group=&holder=&iprtitle=&patent=&submit=draft
>
> The WGLC announcement was made on October 23, 2023:
> https://mailarchive.ietf.org/arch/msg/avt/2GhVCvScV1eetyc7iO3-VEZOaqI/
>
> WGLC ran until midnight Pacific Time on Tuesday, November 7, 2023.
>
> 4 positive responses were received:
>
> Lukasz Kondrad (Nokia):
> https://mailarchive.ietf.org/arch/msg/avt/M9n_9eXldot-qY-yfYPgHyWS19s/
> Ahmed Hamza:
> https://mailarchive.ietf.org/arch/msg/avt/l5Wlk1T7Cv8c9rEcc7chOXP6lbE/
> Srinivas Gudumasu (Interdigital):
> https://mailarchive.ietf.org/arch/msg/avt/okUJKcVPAk-JuCekOi4cBGzKKSg/
> Lauri Ilola (Nokia):
> https://mailarchive.ietf.org/arch/msg/avt/z8WQIKPO1Kocdgj4Kxk2Nw2ajTU/
>
> Two of the four respondents to the WGLC announcement were authors of
> the document.
> Responses did not include comments on the document.
>
> Chairs to confer on next steps.

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