[poisondeathray]

Originally Posted by expanseFan

I didn't know that, thanks. One question though, why other deinterlacers like yadifmod if video was 30i, they deinterlace it and result in 30p instead of 60p?
If 30i is actually 60p, does that mean that videos were really filmed at 60fps and simply interlaced and reduced to 30fps?

No, just the settings used for mode

####	mode -

		Controls double rate vs same rate output, and whether or not the spatial interlacing check is performed.

		0(default) = same rate, do spatial check
		1 = double rate, do spatial check
		2 = same rate, no spatial check
		3 = double rate, no spatial check