[MPlayer-users] Re: [-] Crop before deinterlacing OK?

[Rich Felker]

On Thu, Jul 07, 2005 at 08:20:48PM -0700, RC wrote:
> On Thu, 7 Jul 2005 10:34:40 +0200
> Matthias Wieser <mwieser at gmx.de> wrote:
> 
> > Less work for the deinterlacing filter.
> 
> In most cases, it's a nominal difference.
> 
> > I thought you only need to inverse teleine when capturing NTSC
> > movies. Normal NTSC TV broadcasts can be deinterlaced with pp=[md|
> > lb...], right?
> 
> You'll find that NTSC broadcasts are commonly telecined, also.  Inverse
> telecine filters don't have negative side-effects if the content is
> not telecined, so it's best to always include it.

If it's true interlaced, they have completely random effects..
pullup is harmless on progressive content tho.

> > Mplayer HTML documentation says: "[...]you must crop vertically by 
> > multiples of four or else the inverse-telecine filter will not have 
> > proper data." Which informations included in the TV signal are lost
> > when cropping? I think DVD has something like a soft-telecine flag
> > but TV?
> 
> I was mistaken.  It seems vf_crop does pass the flags other important
> information through.

Oh, I didn't know this. Cool. :)

> However, if your objective is to save CPU cycles, putting crop before
> pullup may be pointless at best, or counter productive at worst.
> Disabling direct rendering in pullup will slow things down, not speed

I already disabled direct rendering in pullup because it was buggy. :(

> them up.  Though, it should make such a very small difference in either
> case I wouldn't bother trying...

Agree.

Rich