Re: Re: avoiding jagged lines on mp2

On Fri, Apr 28, 2006 at 12:24:25PM +0200, herve.flores wrote:
> >Date: Fri, 28 Apr 2006 00:27:23 +0200 (CEST)
> >From: Leonardo Boselli <leo@xxxxxxxxxxxxxx>
> >Subject: [Ffmpeg-user] avoiding jagged lines on mp2
> >
> >result is good if I have images without too much movements, but is the
> >people move too much i get a lod of annoying jagged lines due to
> >interlacing. Other times i resorted in the dirt way, encoding as a  
> >384x288
> >images, so using only even fields , but losing a lot of details.
> >since post of the movie are maps and other drawing of course i want to
> >keep the most detail it is possible, and the problem can be seen  
> >only when
> >some one is gesturing.
> 
> >There is a way to avoid it ?
> yes, use a progressive camera to shoot, like some very expensive HD  
> camera
> 
> seriously, you have an interlaced input and you complain about an  
> interlaced output
> then you want to suppress half of the informations of your input but  
> without loosing quality...

 Actually deinteralcing this is not needed at all. As it was suggested all
that's needed is explicitly tell ffmpeg that input is interlaced by using
-ilme and -ildct options. The jagged lines most probably come from
some "inconsistency" between DV-AVI and MPEG-2. One is Top Field First and
the other is Bottom Field First (by default) I could never remember which
one does it which way but i think DV-Avi is TFF. There is nothing wrong
with TFF MPEG-2 it just needs to be specified in the MPEG-2 "header". AFAIK
ffmpeg doesn't have option to set it. In m$ windows world this can be easily
fixed using f.ex. ReStream  (maybe some other tools too; have a look at
www.videohelp.com)

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