[M4IF Technotes] I-block vs P-block

[Peter Haighton]

Graham,
>When signalling to the decoder what type of encoding was used, can I have
>just one or two blocks / macroblocks that are coded in intra mode whilst
the
>rest are in inter (P) mode?

Yes, any macroblock in a P frame can be either Intra or Predictive.
>How do I signal this? Do I specify that the VOP is a P-VOP and then the
>decoder assumes all MBs are of type P unless otherwise specified?

You specify that the VOP is a P-VOP and then every block inside gets set
as either
Intra macroblock
Inter macroblock
Inter 4MV macroblock
>To what resolution does this work?

Any resolution
>Can I specify the mode down to the block level or is it just down to the
macroblock
>level? (ie I specify the VOP as type P-VOP and then within that just one
block (or
>only macroblock?) is specified as being of type I-block (or only
I-macroblock?)?
You specify that the entire macroblock is of a certain type.
--
Peter Haighton
VideoSpheres Inc.
84 Hines Road
Kanata, Ontario
Canada, K2K 3G3
Tel: (613) 270-9646 x3022
Fax: (613) 271-9442
email: peterh   VideoSpheres.com
See http://www.m4if.org for the latest on MPEG-4
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