Frame Exact Synchronisation in FlashVideo

Hi everyone,
after a rather lenghty post here a concise version ;-)
The Task:
I have to draw a couple of shapes (for highlighting purposes)
on a each frame of a Video (in this case a FLV).
The specification is to be frame exact - and if not, to at
least appear so to the human eye.
The Problem:
As of yet I have not found a way to access individual Frames
exactly. The whole Video decoding Process, as it seems, is
happening internally in the VideoPlayer Class.
My Question is:
How is the Video decoding process for FLVs happening
internally in the VideoPlayer/FLVPlayback Class?
Two possible answers I thought up:
1) Its done by using ActionScript internally. This implies
that there's a Timer object somewhere triggering the Class to draw
a frame, which in turn means, I should be able to capture it during
the capture Phase once the VideoPlayer (of FLVPlayback) is on the
Dispaly List.
Since I haven't been able to capture a Timer.TIMER_EVENT or
anything of the sort I'm not exactly sure (though I don't now if I
might have missed something)
2) Video decoding happens on a lower level using OS or lower
level functions/assembler routines/whatever and NO ActionScript is
invloved. This would imply its inherently impossible to get access
to the frames.
Can anyone confirm this in one way or another?

Thanks for your reply!
Unfortunately the prior encoding is not an option, since one
is supposed to dynamically show or hide multiple highlighting areas
during the movie.
I think no 2) is the most likely case - I have tried
emualting frames by adding cuePoints, but since they weren't meant
for that purpose the system "under the hood" is unable to deliver
them fast enough (fastest I got was 200ms, and I would need 40 ms
when using 24fps) from encountering them in the FLV video to
reaching the eventlistener that would draw the shape.
Now I'm using cuePoints every 200 ms and in between those
cuePoints I draw frames "blindly" using a Timer Object.
Dynamically added cuepoints weren't very precisely triggered
(3 at once and then none, etc..) which led to a lot of jerky or
wobbly drawing. I've now tried using static Cuepoints, encoding
them during FLV encoding, and that works much better now.
Still its only a workaround - but I guess it won't get better
than that.
Anybody else who could prove me wrong? ;-)

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