Re: [MMUSIC] [clue] Incoming liaison statement from MPEG

["Roni Even" <[e-mail]>]

Stephan,

I did not see the liaison statement yet in MMUSIC, so I hope it will be
available in time for us to review. 

>From the example of color primaries I am not sure why we need to have this
in SDP. if this is something that is sent as part of the payload do we need
to send it also in SDP?

 

Roni

 

From: [e-mail] [mailto:[e-mail]] On Behalf Of
Stephan Wenger
Sent: Friday, June 01, 2012 7:29 PM
To: [e-mail]; [e-mail]
Subject: [clue] Incoming liaison statement from MPEG

 

Hi all,

MPEG is working towards codec independent code points, and has sent to
MMUSIC a liaison statement asking for our input.  Especially the audio stuff
may also be relevant to CLUE, so I copy CLUE here as well.  No deadline is
provided, but I note that MPEG meets two weeks before the Vancouver IETF
meeting and the text they sent us is already a CD, so our time to influence
their decisions (if we choose to do so) is limited.

MPEG has observed that many code points relevant for audio and video are
generic in the sense that they can be applicable to many video or audio
codecs.  Recent MPEG (and joint MPEG/ITU) video coding standards have
occasionally copy-pasted whole sections of code points concerning things
like color primaries.  They want to avoid this in the future.  So they farm
out stuff that is historically located in video/audio codec specs, but are
likely to be common between different codecs.

My hunch is that the code point in their draft standard could be translated
to SDP-ish syntax.  At this point, it is XML-ish.

Stephan