scale the speed

Dzien Dobry again,

So, when i use this framedump message with the start-frame and the
end-frame variables, i get to read my film
from one frame to an other one in jit.qt.movie.
The thing is, it's a little bit faster than it should be.

Do you know anyway to scale the speed and which datas are sent without
loosing.

I still want to read this movie 25 frames per seconde... not 15.

Merci.
Czesc.