Option "Fast DeInterlace"

[Cartman]

After reading the doom9 manual about encoding with G'Knot I am not sure what
to do when the preview of DVD2AVI (key F5) shows "Interlaced". I am ripping/encoding
only PAL DVDs.

Does DVD2AVI's output "Interlaced" mean that i have to select "Fast DeInterlace" in
G'Knot? Or only if output "Interlaced" combines with black lines in the video?

As for my already produced DivX5 videos I used always "Fast DeInterlace" when
DVD2AVI showed "Interlaced", wheather there were black lines or not.

If that procedure was wrong: Did that reduce the quality of my DivX5 videos?

[jggimi]

If that procedure was wrong: Did that reduce the quality of my DivX5 videos?Fast deinterlace cuts resolution in half. PAL DVD video streams have a resolution of 720x576. Each frame is made up of two fields, containing either the odd or even lines, each field being 720x288.

Fast deinterlace works by cutting the resolution in half or selecting only a single field. It does so through the AviSynth filter command "SeparateFields().SelectEven()" in Gknot 0.27, or "VerticalReduceBy2" in prior releases. In either case, it reduces uncropped PAL video to 720x288 prior to resizing.

Hakko, Manono, and I wrote a tutorial on figuring out what to do with various types of input -- Hakko wrote some terrific PAL management techniques near the end of it. If you haven't yet read it, try:

www.doom9.org/ivtc-tut.htm.

[Cartman]

Thanks for the doc link, but I still don't know what to select for DVDs like
"Event Horizon" and "Battle Royale". DVD2AVI's preview shows
PAL and Interlaced. In fact, the frames has each second line
shifted. The shifted lines are best visible at scenes with heavy movements.

I suppose that I have to select "Swap Field Order" and later "Fast/Field DeInterlace",
right?

The other kind of DVDs are that ones with PAL Interlaced -- without any
shifts and without black lines. The frames look absolutely ok -- like the
progressive ones.

For this ones I suppose that I have to do nothing special -- no Swapping and
no DeInterlace. Formerly I selected for this kind of DVDs DeInterlace, but
I think I did wrong...

Thanks.

[N_F]

Try reading http://forum.doom9.org/showthread.php?s=&threadid=38351, especially manonos (though credit may (also) go to hakko504(?)) two latest posts where he explains what a field is and writes down step by step how to handle a PAL movie. It should answer all your questions.

This thread in combination with the ivtc-tut is the best source regarding PAL interlacing that I have found yet.