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

[Christer Holmberg <[e-mail]>]

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


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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:
-------------
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--------------------------------------
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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