Netconnect VideoControl half speed

Hey
I’m trying to play a video clip in half speed (12fps) and It’s encoded at (24 fps)…
i have a 3d animation render out in 12 fps in .jpg and joint in to a .avi
avi
12 fps = 63,4
24 fps = 63,4
when i encoded it when .f4v
12 fps = 411kb (play time 4 sek)
24 fps = 218kb (play time 2 sek)
i have found this side, i have no idea what Netconnect is ?
http://newecologyofthings.net/netconnect/Documentation/Interface/VideoControl

All help will be highly appreciated