The most basic problem is the 24 fps established for movies, and the nominal 25 fps of PAL standard TV which is linked to the 50Hz AC that originated in Europe. The lower resolution NTSC TV standard was adopted in America with 29.97 interlaced fps. (Not to mention the SECAM system developed in France which encodes colour differently)

I'll have to read up on EDCF, thanks ;-)

You can't be me, I'm taken