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 http://www.starvision.com