[dvd::rip] Re: Deinterlacing

[Robin Hill <robin@xxxxxxxxxxxxxxx>]

On Mon Jul 25, 2005 at 10:04:10PM +0200, Sylvain wrote:

> 
> 
> Robin Hill wrote:
> 
>     On Mon Jul 25, 2005 at 07:43:25PM +0200, Sylvain wrote:
> 
>         Robin Hill wrote:
> 
>             This depends entirely on the codec - xvid, for example, has an
>             interlaced mode in which case it will deal perfectly well with
>             interlaced video
> 
>         That sounds good to me :)
>         How do you do that (I didn't see anything in the configuration options
>         accessible from dvdrip, but my xvid4conf might bo too old : 1.12) ?
> 
>     On the Features tab in xvid4conf 1.12 there's an Interlaced option box
>     (on my 1.12 there is anyway).
> 
> it is here indeed.
> there were so many boxes I didn't see it, my bad :(
> but they say "this option does not deinterlace video, but encode it
> field-based" ; I'm not sure to understand how it works nor what it deos
> exactly...

Basically, on an interlaced video a single frame (i.e. a full screen
image) is made up of two fields (each field containing alternate lines
of the frame).  So when using interlaced mode xvid will compare the
changes in each alternate field to encode it (so it compares the fields
which will replace each other on the screen).  This means that a single
frame change is repesented by 2 field changes instead.  This means the
end result is still interlaced (so the option doesn't perform
deinterlacing). At least, that's what I understand of it, not having
delved into the depths of the xvid code!


HTH,
        Robin
-- 
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    ( ' }     |       Robin Hill        <robin@xxxxxxxxxxxxxxx> |
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