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Re: [MMUSIC] FW: I-D Action:draft-ietf-mmusic-decoding-dependency-01.txt
Hi Thomas,
Thanks for the update. Some questions:
1- Section 5.2.2: For mdc, we can't signal the operation point
information with this draft. So, what do we do? How do I know whether I
am at the operation point or not?
2- In lay dependency, if 2 depends on 1, 3 depends on 2, does it mean 3
depends on 1? Similarly, in mdc, if 1 has mdc-dependency with 2, 2 has
mdc-dependency with 3, does it mean 1 has mdc-dependency with 3? If
these are already implicitly implied, do we need the explicit
declaration in SDP? Or, do we declare explicitly just to make it more
clear?
3- In Section 6.1: If the receiver does not speak DDP, the draft says
the sender must respond by offering a single media stream. Then, the
example says it could be the base layer. I believe a single media stream
from an mdc content is also acceptable and should be included in the
text.
4- In Section 6.4: I was expecting some text accompanying the examples.
If I recall correctly, there was some confusion about these examples
reported my several people (including me)!
BR,
-acbegen
> -----Original Message-----
> From: mmusic-bounces at ietf.org
> [mailto:mmusic-bounces at ietf.org] On Behalf Of Thomas Schierl
> Sent: Thursday, February 28, 2008 7:58 AM
> To: mmusic at ietf.org
> Cc: jf.mule at cablelabs.com; 'Joerg Ott'
> Subject: [MMUSIC] FW: I-D
> Action:draft-ietf-mmusic-decoding-dependency-01.txt
>
> Hi all,
>
> We submitted a new revision of the signaling draft for layered codecs.
> Please see attached email.
>
> The "depend" attribute is further extended by multiple
> payload types for a dependent "mid". Please have a look. A
> presentation on the updates will be given during the MMUSIC
> session in Philadelphia. I hope that we can go for WGLC right
> after the meeting.
>
> See you soon,
> Thomas
>
>
> > -----Original Message-----
> > From: mmusic-bounces at ietf.org [mailto:mmusic-bounces at ietf.org] On
> > Behalf Of Internet-Drafts at ietf.org
> > Sent: Monday, February 25, 2008 2:45 PM
> > To: i-d-announce at ietf.org
> > Cc: mmusic at ietf.org
> > Subject: [MMUSIC] I-D Action:draft-ietf-mmusic-decoding-dependency-
> > 01.txt
> >
> > A New Internet-Draft is available from the on-line Internet-Drafts
> > directories.
> > This draft is a work item of the Multiparty Multimedia
> Session Control
> > Working Group of the IETF.
> >
> >
> > Title : Signaling media decoding dependency in Session
> > Description Protocol (SDP)
> > Author(s) : T. Schierl, S. Wenger
> > Filename : draft-ietf-mmusic-decoding-dependency-01.txt
> > Pages : 16
> > Date : 2008-02-25
> >
> > This memo defines semantics that allow for signaling the decoding
> > dependency of different media descriptions with the same
> media type in
> > the Session Description Protocol (SDP). This is required, for
> > example, if media data is separated and transported in different
> > network streamsas a result of the use of a layered or multiple
> > descriptive media coding process.
> > A new grouping type "DDP" -- decoding dependency -- is
> defined, to be
> > used in conjunction with RFC 3388 entitled "Grouping of
> Media Lines in
> > the Session Description Protocol". In addition, an attribute is
> > specified describing the relationship of the media streams
> in a "DDP"
> > group indicated by media identification attribute(s) and
> RTP payload
> > type(s).
> >
> > A URL for this Internet-Draft is:
> > http://www.ietf.org/internet-drafts/draft-ietf-mmusic-decoding-
> > dependency-01.txt
> >
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> > NOTE: The mail server at ietf.org can return the document in
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> > Below is the data which will enable a MIME compliant mail reader
> > implementation to automatically retrieve the ASCII version of the
> > Internet-Draft.
>
>
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> 59RUD97!E;F1E;F-Y+3 Q+G1X= T*
> `
> end
>
> begin 666 draft-ietf-mmusic-decoding-dependency-01.txt
> M0V]N=&5N="U4>7!E.B!T97AT+W!L86EN#0I#;VYT96YT+4E$.B \,C P."TP
> =,BTR-3 U,SDT,"Y)+41<0&EE=&8N;W)G/@T*#0H` ` end
>
> begin 666 ATT01700.txt
> M7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?
> M7U\-"FUM=7-I8R!M86EL:6YG(&QI<W0-"FUM=7-I8T!I971F+F]R9PT*:'1T
> J<#HO+W=W=RYI971F+F]R9R]M86EL;6%N+VQI<W1I;F9O+VUM=7-I8PT*
> `
> end
>
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