[MPlayer-users] Confused about deinterlacing and scaling

[Dominik 'Rathann' Mierzejewski]

On Wednesday, 28 July 2004 at 18:55, * wrote:
> --- Dominik 'Rathann' Mierzejewski <dominik at rangers.eu.org> wrote:
> > On Wednesday, 28 July 2004 at 09:36, * wrote:
> > > Hello, I'm about to spend 14+ days encoding some DVDs of television
> > > shows and it would be *fantastic* if someone could glance at my
> > > options and point out anything wrong (from past history I'm positive
> > > I must be doing at least a couple things wrong).
> > > 
> > > In particular I'm confused about the pp to use for deinterlacing.
> > > It sounds like pp=lb is best in theory but I have to say that pp=ci
> > > looks a lot less blurry.
> > > 
> > > Also I'm not clear on whether (or how) to scale after deinterlacing
> > > and cropping.
> > > 
> > > Anyway here are some relevant lines from the mplayer header:
> > > 
> > >     VIDEO:  MPEG2  720x480  (aspect 2)  29.970 fps  9800.0 kbps
> > >     Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
> > >     VO: [xv] 720x480 => 720x540 Planar YV12
> > > 
> > > Maybe the 720x540 means it was originally PAL TV?
> > 
> > No. PAL DVDs are encoded with 720x576 resolution. And yours looks like
> > NTSC, so I think what you're seeing is not interlacing but telecine.
> > MEncoder can reverse it using pullup or filmdint. See
> > menc-feat-telecine.html in the HTML docs. Remember to consult man
> > mplayer
> > before using any filters (for example, you need softskip after
> > pullup for
> > it to work correctly and all inverse telecine filters need -ofps
> > 24000/1001).
> > 
> > R.
> > 
> Actually I think it is not telecine- that's what I first assumed but
> when I try using pullup or ivtc there are a constant stream of
> messages about "Duplicate frame" and the video looks jerky.  I'm not
> sure how to tell if it's telecine other than that.

That's why I told you to read the docs and use -ofps 24000/1001.

> Assuming it's not telecine, do you think those options are okay for
> deinterlacing, cropping and resizing?  Thanks!

Yes. Although the bitrate is a bit low for 640x480. I'd recommend
about 1200kbps or 512x384. Check the calcbpp.pl script in TOOLS.

R.

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