[MPlayer-dev-eng] is there someone familiar with the pullup process?

[U. George]

I have a vixia hfs100 camcorder that produces PF24 ( canon labeled ) 
video format.
the format is progressive frames ( 30fps ) which does not use the 2:3 
pullup scheme ( I think )

when I look at the raw footage on sony vegas I see
F:F:D:F:F: F:F:D:F:F F:F:D:F:F

where F is a progressive frame
and   D is a complete duplicate of the previous progressive frame.

I would like to edit the mencoder pullup source code to handle this PF24 
format to remove the duplicate frame and create the 24fps progressive file.

What do i have to read (or communicate with ) to begin this process?