interlace?

[Gildas Bazin]

On Sunday 05 August 2001 7:04 pm, Bjarne Wichmann Petersen wrote:
> Hi
> 
> When I try to play various manga-movies I get this "interlace" effect for
> moving objects. It's like half the object moves while the rest is delayed.
> I can't figure out whether it's a decoding/display-issue or the movies
> have been decoded that way?
> 

The problem you see comes from the fact that you are playing an "interlaced 
video" (that is designed for TV sets) on a progressive scan screen (computer 
screen). Each picture of an interlaced video is composed of two field, and 
each field is supposed to be displayed one after the other. But a computer 
screen can only display them at the same time (thus the artefact).

VLC doesn't implement any option to improve the output quality of interlaced 
videos.
Basically you've got two solutions two improve the quality:
* The cheap one which would be two discard one field, so lower the vertical 
resolution.
* The computer intensive one which would be to do some postprocessing on each 
picture to smooth the interlace artefact.

It shouldn't be to much work to implement the first solution (as a first 
step).

--
Gildas