Excellent article all about interlacing

[Steve Mackay]

I'm still trying to fix my horizontal lines on movie issues. While looking I found this excellent site about interlacing. Note it talks about PAL standards mainly.

http://100fps.com/

I hope this helps

Steve

[Melkor]

I posted a couple other articles here,
https://www.videohelp.com/forum/viewtopic.php?t=200037

Take care.

[teegee420]

Great info, Melkor. Perhaps you or someone else can enlighten me on something I don't completely understand. If VCD mpegs are progressive, why do they look normal on the TV? Is this because I have a progressive scan DVD player? Does that mean I can encode all of my video as progressive and they'll look fine on TV?

[Melkor]

Hey teegee,

Your DVD player takes care of the problem for you via telecining (3:2 pulldown) in real time.

This is my basic understanding of this.. if my facts are off someone please feel free to correct me.....
It takes the 24 fps progressive source and inserts another frame for 5 frames per 1/60th of a second or 30 fps output. Frames 2 and 3 "swap" fields from the proceeding frames. You can see a good example of this at this website:

http://www.animemusicvideos.org/guides/avtech/video2_2.htm

Yeah, if your goal is TV playback (all I ever do) then you can just use progressive. Everything I've encoded from day one (DivX & XviD .avis) I've done as progressive and haven't had any playback problems.

Take care.

[Melkor]

One other thing...

I always encode at 23.97 fps and use the 3:2 pulldown.

Later