[MPlayer-users] deinterlace+horiz scale

[Jan Knutar]

> I was trying out "-vf field" a while back, and I found something
> strange.  It seems the quality is much better if I just use scale to
> halve the vertical resolution, rather than using field.  -vf field
> resulted in stair-stepping lines, and just an all-around much lower
> quality picture, while halving the resolution with scale produced a
> picture that looked very nearly as good as full-res.

That makes sense. -vf scale would have averaged two lines into one, or 
something similar, while -vf field throws away every other line.