[M4IF Technotes] one simple question

[Wo Chang]

Dear All,
One simple question:
When counting frame in MPEG-1/-2/-4 video clip, 
do we (MPEG'ers) use "0" or "1" base when counting 
the very first frame?  I came across materials using 
"1" as the starting frame but that may not be the 
MPEG's convention.
The reason why I asked this is, let's say you have 
a group of collaborators reviewing shots.  We will
need to establish what is the first frame called:
frame 0 or frame 1, so that at a later time, if we
say "look at frame 928", then we all will look at
the exact frame.
I just want to know, how do MPEG'ers normally count
the frame, do you count the very first frame as frame "0"
or frame "1".
Thanks!
--Wo