[Mp4-tech] MPEG-4 and synchronized interactive applications

[dominique.delcoigne belgacom.be]

Dear experts,
In the traditional digital broadcast world (DVB-MPEG-2), several operators choose for MHP in order to develop interactive applications.
Several MHP applications do not require a sync with the audiovisual stream (e.g. standalone game, SuperTeletext, ...); however other applications such as a pop-up during a commercial advertising, a locally playable game show,  etc... require a perfect sync with the audiovisual stream.  MHP 
When operating an MPEG-4 broadband (IP) network, a part of the content will be picked up from DVB sources (satellite, cable, etc...) that include MHP applications.
How does MPEG-4 tackle this ?
- Conversion of MPEG-2 audio and video (A/V) into MPEG4 audio and video (OK we could even pass thru baseband SDI with full reencoding) -  This is not the biggest issue I think.
- What about the MHP applications synchronized with the video content: part of the Java code included in MHP is reused for MPEG-J  'translation' in MPEG-4 ? how is made the sync with A/V ?  Or do we come to the conclusion that there is a need to develop an application code for each system (traditional broadcast DVB MHP) and application code (based on MPEG-J or proprietary middleware software (likly based on Java)) for MPEG-4 IP distribution ?
- Is the DVB consortium tackling this convergence ?  If yes, how far are we in the roadmap ?
Any clue how to tackle this issue ?
Thanks
Dominique
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