To deinterlace or not to deinterlace that is the question?

[skydiver]

Coming from flask it is easy to tell when to deinterlace because the opening screen tells you when the movie is interlaced. I am now using GK and do not know how to tell if the orig movie is interlaced or not. I am assuming that if the movie is interlaced all I would have to do is check the feild deinterlace option or fast deinterlace. Is this the correct/best way?
Thanx in advance

[Enchanter]

Viewing various scenes from the movie, esp. the fast-motion ones, will reveal whether the movie requires deinterlacing or not. Generally, NTSC materials (29.97 fps or originally-FILM 23.97 fps) come with interlace artifacts. PAL movies (25 fps) rarely suffer from those.