Re: [MMUSIC] [Technical Errata Reported] RFC5576 (7544)

[Christer Holmberg <[e-mail]>]

Hi Harald,

>... and: If we don't add this clause in the grouping framework, we have to 
>add errata to every single usage of the grouping framework (AFAIK all of 
>them) where adding an element multiple times doesn't make sense, to say "and 
>btw, you can't have >multiple elements with the same value".
>
>One fix or many fixes?

The errata is not for the grouping framework (RFC 3388) - it is for the 
ssrc-group attribute (RFC 5576).

(I was using the grouping framework as an example where we don't have similar 
text as the text suggested in the errata.)

Regards,

Christer


On 6/16/23 03:18, Christer Holmberg wrote:
> Why would someone use something like a=ssrc-group:FID 1234 1234? And,
> even if someone does, what error would it cause?
>
> Also, we don't have similar text for e.g., the SDP group attribute.
>
> Regards,
>
> Christer
>
>
> -----Original Message-----
> From: mmusic <[e-mail]> On Behalf Of RFC Errata System
> Sent: Thursday, 15 June 2023 21.37
> To: [e-mail]; [e-mail]; [e-mail];
> [e-mail]; Francesca Palombini
> <[e-mail]>; Bo Burman
> <[e-mail]>; [e-mail]
> Cc: [e-mail]; [e-mail]; [e-mail]
> Subject: [MMUSIC] [Technical Errata Reported] RFC5576 (7544)
>
> The following errata report has been submitted for RFC5576,
> "Source-Specific Media Attributes in the Session Description Protocol 
> (SDP)".
>
> --------------------------------------
> You may review the report below and at:
> https://www.rfc-editor.org/errata/eid7544
>
> --------------------------------------
> Type: Technical
> Reported by: Philipp Hancke <[e-mail]>
>
> Section: 4.2
>
> Original Text
> -------------
> Every <ssrc-id> listed in an "ssrc-group" attribute MUST be defined by
> a corresponding "ssrc:" line in the same media description
>
> Corrected Text
> --------------
> Every <ssrc-id> listed in an "ssrc-group" attribute MUST be defined by
> a corresponding "ssrc:" line in the same media description and MUST
> appear only once in this ssrc-group
>
> Notes
> -----
> The goal is to clarify that something like
>    a=ssrc-group:FID 1234 1234
> is not valid. While this is demuxable (in the BUNDLE sense) it would
> require chaining of ssrc-demuxing and payload type demuxing which is a
> lot of complexity.
> The uniqueness is already implied by the following sentence (emphasis
> is
> mine):
>     The SDP media attribute "ssrc-group" expresses a relationship
> among
> *several* sources of an RTP session earlier in the section.
>
> Instructions:
> -------------
> This erratum is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or rejected.
> When a decision is reached, the verifying party can log in to change
> the status and edit the report, if necessary.
>
> --------------------------------------
> RFC5576 (draft-ietf-mmusic-sdp-source-attributes-02)
> --------------------------------------
> Title               : Source-Specific Media Attributes in the Session
> Description Protocol (SDP)
> Publication Date    : June 2009
> Author(s)           : J. Lennox, J. Ott, T. Schierl
> Category            : PROPOSED STANDARD
> Source              : Multiparty Multimedia Session Control RAI
> Area                : Real-time Applications and Infrastructure
> Stream              : IETF
> Verifying Party     : IESG
>
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