izzy wrote:
Also (rana i think you will like what u am going to say next) if you have a interlaced dvd the dvd will de-interlace it and make it into a progressive dvd while you are watching the movie.
There are lots of de-interlacing programs. Nothing beats digitally obtained original '24 film frames per sec' using flags if avail in the encoding.
Next best is to obtain 24 film frames per sec based on 2-3 pattern (Film to NTSC), avail in what we call Pseudo-prog DVDs.
Field Averaged DVDs have 60 mixed up fields (Khichdi) made from 24 film frames. The best progressive signal you can get is 60 Khichdi fields per sec. This, I think is called De-Interlacing. So, de-interlacing doesn't work for Field Averaged DVDs. Such De-Interlacing is best suited for NTSC shot 60 individual pictures per sec material, like NTSC (or PAL @ 50 fields per sec) Camera shot music videos. De-interlacing will not work for those DVDs that have been Field Averaged (if) in the process of converting from PAL to NTSC or vice-versa. 
Rana