[MEncoder-users] Deinterlacing produces red and green ghost effects - looks off

[Rich Felker]

On Wed, May 11, 2005 at 08:42:28PM +0200, Sebastian wrote:
> Sebastian schrieb:
> > Hi all,
> > 
> > I got some interlaced PAL material here. I'm trying to deinterlace, but
> > no matter which filter I use the result looks off when there's high
> > motion. I'm using mplayer/mencoder CVS-050511-14:33-3.3.5-20050130.
> > I've uploaded pictures of a guy in a smoking rasing his hand and then
> > lowering it.
> > 
> > http://www-users.rwth-aachen.de/sebastian.kemper/deinterlace1.png
> > 
> > Here the guy raises his hand. The red ghost hands is faster then the
> > guys hand.
> > 
> > http://www-users.rwth-aachen.de/sebastian.kemper/deinterlace2.png
> > 
> > Here the guy lowers his hand. But this time a green ghost hand is slower
> > then the guys hand.
> > 
> > What's wrong? Can the filters be fixed? Or is it because the first half
> > of the movie is progressive and the second is interlaced and mplayers
> > decoder doesn't get it? I read something alike here:
> > http://forums.3ivx.com/cgi-bin/ikonboard/topic.cgi?forum=14&topic=124
> > They figured it's the "Chroma Bug" and linked a description.
> > 
> > Thanks
> > 
> > Sebastian
> > 
> > _______________________________________________
> > MEncoder-users mailing list
> > MEncoder-users at mplayerhq.hu
> > http://mplayerhq.hu/mailman/listinfo/mencoder-users
> > 
> > 
> Hi :D
> 
> Nevermind! I think I've found the solution here ->
> http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-telecine.html section
> 7.12.4.1, that is I have to crop dividable by 4 vertically. Now the
> 'ghosts' are gone.

Oh, yes, that would be a cause for the problem too. Actually I wrote
that part and had copy&pasted it in as part of the above explanation
of what I _thought_ the problem was, but then I decided it wasn't
relevant. Never thought of the fact that your crop offsets might be
bad.. :)

Rich