Re: [MMUSIC] New Version Notification for draft-abhishek-mmusic-superimposition-grouping-00.txt

[Rohit Abhishek <[e-mail]>]

Hi Christer,

Thank you again for reading the draft and your comments/suggestions.
Please see inline below. 

On 12/12/20, 11:06 AM, "Christer Holmberg" <[e-mail]> wrote:

    Hi,

    A few comments (some of which I gave already previously):

    Q1:

    In Section 1, where you talk about the limitations of the mechanism, you should mention that CLUE must be used something more "fancy" is needed.
(RA: Sure. Will add this.)
    ---

    Q2:

    In Section 3, you require a specific order of the m- lines in the SDP. I think SDP explicitly says that the order of m- lines is not relevant. Also, I know that parsers may change the orders of the m- lines.

    (I also think that any counting should start from 1, not 0)

    My suggestion would be to have an explicit "order" attribute instead.
(RA: Thanks for the suggestion. Will update this in the next version.)
    ---

    Q3:

    The example in Section 6 talks about "a background video". But, this background video is not described in the SDP.

    Related to that, if the SDP describes multiple "background videos", you need to describe how you map superimposed videos to a specific background video. 

    Based on the text in Section 3 (see Q2), I am not sure whether the 0th m- line is supposed to be the background video, but the text in Section 6 says that both m- lines are for superimposed video streams.

(RA: Currently we are not addressing the signaling of background video (we are planning to add this in the next version.) Therefore, 0th m-line indicates the superimposed streams.
I understand the confusion here due to the example in Sec 6. Will update the ordering as per your suggestion in sec 3.
    ---

    Q4:

    What happens to the superimposed videos if I disable/remove/mute the background video?

(RA: This should be left to the rendered. For ex, using a default background image/video)
    ---

    Q5:

    This is editorial, but please call the group attribute something else than just "S". "supim", "spim" or something :)
(RA: Thanks for the suggestion. "supim" sounds great. __ 

    Regards,

    Christer



    -----Original Message-----
    From: mmusic <[e-mail]> On Behalf Of Rohit Abhishek
    Sent: lauantai 12. joulukuuta 2020 0.28
    To: [e-mail]
    Subject: [MMUSIC] FW: New Version Notification for draft-abhishek-mmusic-superimposition-grouping-00.txt

    Dear All,

    A new version of the draft “SDP Superimposition Grouping framework” has been uploaded. 
    We have changed the name from  “SDP Overlay Grouping framework for immersive telepresence media streams” to  “SDP Superimposition Grouping framework” as the previous name wasn’t an accurate description of the content. Therefore, we had to start from version 00.

    Thank you all for the comments/suggestions on the previous draft.
    We have tried to address them in this version. Specifically, a transparency attribute and an informative Section on relationship with CLUE has been added.

    Comments/Questions/Feedbacks are welcome.

    Best Regards,
    Rohit

    On 12/11/20, 12:41 PM, "[e-mail]" <[e-mail]> wrote:


        A new version of I-D, draft-abhishek-mmusic-superimposition-grouping-00.txt
        has been successfully submitted by Rohit Abhishek and posted to the
        IETF repository.

        Name:		draft-abhishek-mmusic-superimposition-grouping
        Revision:	00
        Title:		SDP Superimposition Grouping framework
        Document date:	2020-12-11
        Group:		Individual Submission
        Pages:		8
        URL:            https://www.ietf.org/archive/id/draft-abhishek-mmusic-superimposition-grouping-00.txt
        Status:         https://datatracker.ietf.org/doc/draft-abhishek-mmusic-superimposition-grouping/
        Htmlized:       https://datatracker.ietf.org/doc/html/draft-abhishek-mmusic-superimposition-grouping
        Htmlized:       https://tools.ietf.org/html/draft-abhishek-mmusic-superimposition-grouping-00


        Abstract:
           This document defines semantics that allow for signaling a new SDP
           group "S" for superimposed media in an SDP session.  The "S"
           attribute can be used by the application to relate all the
           superimposed media streams enabling them to be added as an overlay on
           top of any media stream.  The superimposition grouping semantics is
           required, if the media data is separate and transported via different
           sessions.




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