[M4IF Technotes] Technical question concerning BIFS

[AVARO Olivier FTRD/DIH/REN]

Hi there,
> I have one more technical question concerning MPEG-4 which I 
> do not find
> immediately an answer to in the MPEG-4 documents I posses.
> 
> Is it correct to say that the BIFS description is stored in a seperate
> elementary stream. This stream is then combined with the other
> elementary streams.

Yes, BIFS is represented in a separate ES (stored or transmitted BTW). If by
combination you mean multiplexing, it then depends on the transport
protocols you use, but it is not necesseraly true (ex : you can have a local
BIFS scene and transmit just the AV streams).
> Would it be possible to send this BIFS-stream in advance through a
> network and then combine the BIFS-stream with the other data on the
> moment of playback. Would this theoretically be possible or can it
> (nowadays) be done in real live applications ?
Definitly. 
Kind regards,
Olivier