[MPlayer-users] Comparison of different deinterlace and denoise filters

[Fabio Papa]

On Wednesday 22 October 2003 20:36, D Richard Felker III wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
>
> On Wed, Oct 22, 2003 at 08:44:31AM +0200, Fabio Papa wrote:
> > [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> > On Wednesday 22 October 2003 05:38, D Richard Felker III wrote:
> > [snip]
> >
> > > Once you have interlaced 4:2:0 video like this, you can display it
> > > properly (still interlaced) with -vf ilpack. And of course it's ready
> > > for deinterlacing or inverse telecine.
> >
> > Ok, sorry folks to bump in a second time, but I've similar problems with
> > deinterlacing and I'm interested in all this.
> > Rich, you said earlier that scaling operation must be included in the two
> > il in the vf chain, to avoid problems that comes from interlaced videos.
> > Then here you're saying that such a video is then ready to be
> > de-interlaced. Hav I got you right? If so, I thought deinterlacing was
> > only good on unscaled videos: am I wrong here?
>
> Yes, definitely wrong. The statement of the rule is "you cannot scale
> interlaced video as if the frames are a single picture". If you do so,
> you'll ruin it. Of course you're perfectly free to scale the two
> fields separately, though. Here's a summary:
>
> 2 interlaced fields     --scale-->     trash, output is absolutely
> treated as 1 frame                     worthless and ruined
>
> 2 interlaced fields     --scale-->     still 2 interlaced fields,
> treated as separate                    just scaled to a different
> images                                 size
>
> Using the il=d:d and il=i:i filters enables you to (roughly speaking)
> treat the two fields independently.
>
> Finally, deinterlacing can be performed on any valid interlaced
> frames. The "you can't deinterlace scaled video" myth comes from the
> fact that most people stupidly try to scale interlaced video as if it
> were a progressive frame, thereby ruining it for ANY further use (not
> just for deinterlacing).

Ok, very clear. Thanks for the info!

>
> Rich
>
>
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-- 
Fabio Papa
Engineering division
Machining Centers Manufacturing S.p.A.
viale F. e G. Celaschi 19 - Vigolzone (PC) Italy