[MPlayer-users] Best way to always scale+expand to 640x480?

[Steffen Barszus]

On Saturday 28 December 2002 01:16, Ed Fisher wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Here's the issue:  I need to always be able to scale a movie, no matter
> its resolution, to 640x480, but preserving its aspect ratio.  I don't
> know the resolution or aspect ratio ahead of time, so I can't
> intelligently pass the exact -vop expand=x:y,scale=x:y on the command
> line.
>
> I tried -vop expand=640:480,scale=640:-1 but that didn't work--it simply
> retained the source movie's height, rather than automatically scale,
> say, scale a 576x320 movie to 640x352 (and then the expand would stretch
> it to 640x480).

Hmm this should definitly  work, if I had understand the manpage correct. I 
played too a lot with these options for dvb-output and svcd-encoding. I can 
have a closer look if needed. AFAIR I had problems, and had to decide between 
2 cases (if 640:-1 gives a bigger value than 480). I gave up after a time, 
But I will write a little script for making svcd-compatible mpeg2-files with 
mplayer as scaler, so maybe I can help you tommorow. 
Maybe autoscaling for height do not work if there is no AR given ? (and AR is 
not calculated for avi's from it's resolution ? 

> So does anyone know of a way to do what I need?
>
Not really. If there is a solution, it would be great.

> As a side note, I also noticed that in mplayer (CVS 021227) -vo xv with
> -vop expand gives me bright grey borders instead of black letterboxing
> like I normally expect.  If i use -vo sdl and -forcexv, though, it looks
> fine.  Anyone know what's going on?
>
> Thanks,
> gleam

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