[MPlayer-users] Re: AVI->DVD: Problem understanding expand and scale

[Giacomo Comes]

On Sat, Oct 08, 2005 at 09:15:11AM +0200, Thomas Heuving wrote:
> Nico Sabbi schrieb am Thu, 06 Oct 2005 10:10:04 +0200:
> >>  mencoder -oac lavc -ovc lavc -of mpeg -mpegopts format=dvd -vf
> >>  expand=672:378:16:4,dsize=16/9,scale=720:576,harddup
> >>  -lavcopts aspect=16/9:acodec=ac3:abitrate=192:vcodec=mpeg2video:
> >>  vrc_buf_size=1835:vrc_maxrate=9800:vbitrate=5000:keyint=18
> >>  -o test.mpg -endpos 100 my.avi
> >
> > why not simply -vf scale=-1:-10,expand=720:576,harddup
> > to keep the original width, or
> 
> that works, but I want some black borders as most DVD-Players seem
> to cut some of the original content in order to present the material
> on the Television. I think that's the reason why commercial content
> tends to have black borders too (?).
> Less complicated is
> scale=-1:10:::::pal (or ntsc)
> so you don't have to expand by yourself.
> 
> > -vf scale 720:-10,expand=720:576,harddup  to resize the width to 720
> > and the height according to the A/R ?
> 
> This gives bad distortions.
> 
> > unnecessarily complicated
> 
> But it seems to be necessary to do two invokations, as I didn't find
>  and nobody mentioned a working example of putting black borders and do
>  a scaling in one go.

I already told you that that if you do scale-expand you can do it in one pass.

For you particular movie

-vf scale=684:547,expand=720:576  will add 5% border and
-vf scale=648:518,expand=720:576  will add 10% border

This numbers assumes that your avi has aspect ratio 1:1 and the mpeg aspect 16/9.
If the aspect ratio is different, the numbers have to be modified.

Giacomo