[MEncoder-users] How does one interlace progressive content?

[Grozdan Nikolov]

On Sunday 05 August 2007 07:06, RC wrote:
> On Sun, 5 Aug 2007 03:08:15 +0200
>
> Grozdan Nikolov <microchip at chello.be> wrote:
> > so how are interlaced PAL DVDs made? I have a couple of them here and
> > mplayer  always reports 25fps frame rate
>
> They are interlaced to begin with, NOT converted from progressive to
> interlaced.
>
> I can't imagine what you hope to accomplish by converting progressive
> video to interlaced, but I can assure you it won't have any positive
> effects at all.

Hi RC,

I'm actually trying to accomplish nothing. It's not that I encode progressive 
content to interlaced. I'm trying to understand how interlacing (and 
telecine) is made because I'm curious. I know interlacing and telecine is bad 
but I'm curious about how it is made, hence all the questions I asked here in 
the past ;)

>
> > I did a small test here with tinterlace=4 on a 25fps progressive PAL
> > DVD and  during encoding, mencoder printed a lot of duplicate frames
> > but the result  was a 25fps file (or at least that's what mplayer and
> > avidump reports). The  file played just fine without sync issues and I
> > could see the interlacing
>
> If you set -ofps mencoder will skip/duplicate frames as needed to get
> the framerate you've set.  Your video, however, is now double-height
> (eg 720x1152) and pretty much useless.
>
> _______________________________________________
> MEncoder-users mailing list
> MEncoder-users at mplayerhq.hu
> http://lists.mplayerhq.hu/mailman/listinfo/mencoder-users