[M4IF Technotes] Live streaming BIFS commands

[Nik]

Hi there.   I hope you can help me with this fairly high level question.
In a live mpeg-4 streaming situation, what tool would one use to
manipulate the scene description on the fly so as to remove/add more
live streams etc.?Assume for example, one wished to add a live stream
with a URL that was unknown at the start of transmission.
Do these tools exist, or would they have to be integrated with the
streaming server?
Thanks for your time :)
Nik.