[M4IF Technotes] video windowing

[AVARO Olivier FTRD/DIH/REN]

I am trying to find out if there is a tool or feature on the MPEG-4 spec that will allow you to set-up a window within the frame area and only decode the area included in the window. For instance imagine looking at the video on a screen, and being able to interactively  select a particular area  of the video using your mouse, so that only that area is displayed (and of course only the part of the codestream pertaining to such area is actually decompressed). 
I am trying to find out if there is a specific profile and/or tool that covers this mode of operation. 
I am not sure if this mode of operation is possible with just decdoding what you see on the screen.
I am not sure  it is practical either.
But what can be done is to decode a frame bigger than what you display and navigate in it.
You will need a minimal scene info. for that (BIFS).
cu,
O. 
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