[M4IF Technotes] B-frames in Simple? Which Levels?

[Rob Koenen]

>     Which Profiles/Levels of Visual don't support B-frames?  

Simple, Advanced Real-Time Simple (ARTS) don't hae it 
( and Simple Studio and Core Studio on the high end. )
Whether or not B frames are supported is exclusively determined by
the Profile.  Within the Profile, the level definition doesn't 
change it.
> I have it in my
> head that Simple doesn't, in at least some cases, but am fuzzy on the
> details.

http://www.m4if.org/resources/profiles/index.html gives some info, but
not all the Profile details, I now realize. We'll try to update. 
Rob