MCU features

Nancy Greene ngreene at NORTEL.CA
Thu Aug 28 10:46:00 EDT 1997


Your presence at the SunRiver meeting would be welcome! There will
be a joint Q3/Q14 meeting to define the scope and work plan to
standardize multipoint A/V control. Some functionality currently in T.130 is
proposed to be added to H.245 (e.g. remote device control). Whether
even more functionality for multipoint A/V control is added to H.245 will
be debated.

If you can provide any input on functionality you would like to
see in H.245, or in T.130, this is the time to provide it. The current
scope of T.130 and T.132, and H.245 is open for discussion.

Hope to see you in Sun River,

Nancy Greene, Nortel
Tel 613-763-9789   Fax 613-763-8904   Email ngreene at
In message "MCU features", 'rjang at' writes:

>I'm not sure if this is the right email address,
>but here goes...
>We at Starvision are developing a broadband MCU
>product. The first phase of our product is now complete.
>It is a prototype which performs parallel real-time video
>processing on up to 10 video streams. Some features
>currently implemented are arbitrary scaling, panning,
>positioning, z-buffering, alpha-blending, chroma-keying,
>text overlay and graphics overlay. The platform can
>support any combination of # of conferences
>and # per conference up to a total of 10.
>Currently control of the A/V feature set
>is proprietary.
>The next phase of our development is to increase
>the number of user streams supported in the MCU,
>to provide transport over ATM and to conform as close
>as we can to current and developing ITU standards.
>Among many of the issues we're investigating, one of
>the items in question is the issue of the overlap in
>functionality between H.245 and T.120.
>Our MCU has many audio/video processing features currently
>not defined in either H.245 or T.130. In H.323, Section 6.6,
>it is stated that "criteria for which [video] sources
>and how many are mixed is determined by the MC until
>other controls are defined. The use of the T.120-Series
>Recommendations for these control functions is for
>further study."
>Is there anywhere I can be pointed to for information
>and discussion regarding these multipoint A/V control functions?
>I would think that this is not something that would go into
>the H.245 spec. Is the current thought to use T.130?
>Any info is much appreciated.
>Ray Jang
>Technical Leader, R&D
>Starvision Multimedia

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