[M4IF Technotes] Interactive within interactive

[AVARO Olivier FTRD/DIH/REN]

Hi Nik,
> I understand the concept of abstracting out audio video objects, which
> can then be composed as you like, but could one of these 
> objects in turn
> be *another* mpeg-4 file with its own interactivity etc.?

Yes, this is definitly possible. BIFS offers this kind of interactivity.
> So if we had a complex mpeg-4 file exhibiting interactivity (still not
> sure-is this likely to be advanced simple profile?), could we then
> interact with a similar file (same profile) embedded somewhere within
> it?
The interactivity is described independently from the video or audio
object in the form of a BIFS stream. So advanced simple profile (a video
profile) does not help you for that. You need a scene description (BIFS)
profile. Then you can compose interactive scenes with virtually any
level of embedding. Each of these scenes can be stored in independant
MP4 files or packaged in a single one.
Kind regards,
Olivier