[MPlayer-users] deinterlace+horiz scale

[rcooley]

On Sat, 5 Jun 2004 14:13:44 -0400
D Richard Felker III <dalias at aerifal.cx> wrote:

> And it also has ghosts whenever there was motion!! VERY VERY BAD!!
> (Same thing as pp=lb :) 

Blur isn't good, but I think you over-state it.  With deinterlacers, I
use pp=lb because it's the only one that doesn't produce
terrible-looking output.  pp=md looks bad on most material, and
absolutely terrible on high-contrast material like animation, on-screen
text, etc.

I guess I should go try this on some animation to see what artifacts
I can pick-out...

> It's especially bad if your video happens to
> be telecined rather than 50/60 fps interlaced, since the ghosts will
> flicker in and out and be 2.5x as large when they do appear.

Hmm.  I don't understand why they would be 2.5X as large.  Anyhow,
wouldn't adding -vf ivtc take care of that?

> No, it's a "bug" in the brains of the idiot engineers who designed
> interlacing. Interlacing is inherently flawed because both fields are
> undersampled (and thus they alias) 

Well, it's just that I would have thought that -vf field would have done
a bit more to improve the quality...