[MPlayer-users] Re: Split an Mencoder Divx with vbr mp3 audio

[martin pavon]

 --- Kim Minh Kaplan <kmkaplan at selfoffice.com> escribió: > [Automatic
answer: RTFM (read DOCS, FAQ), also read
> DOCS/bugreports.html]
> Green, Shaun writes:
> 
> > But it's MUCH less intuitive and harder to setup and get the right
> aspect
> > ratio. By specifying crop, then scale, yes you actually are scaling
> first,
> > which gets the aspect ratio correct, then you crop the black bars
> away. This
> > is intuitive and easy to understand.
> 
> You can use something like scale=640:-2,crop=... to automatically get
> the correct aspect.  Off course this will not make the height a
> multiple of 16.  Maybe there should be some options for scale to get
> some modulo values.  This was discussed some times ago but I think no
> conclusion was reached.
> 
> Just in case you want to know, in scale=W":H",crop=W':H' with a movie
> size of WxH (usually 720x576 or 720x480) with an aspect A (usually 4/3
> or 16/9), you have the following relation:
> 
>  W"        H     W'
> --- = A * --- * ---
>  H"        W     H'
> 
> Mmm, I think I'm gonna write my encoding cookbook...
> 
> Kim Minh.
> 

Hi Kim !!!!

That's an excelent idea !!!! I'd like very much to read it. In the
meantime, can you confirm that the order of the options is important?
-vop scale=640:352,crop=704:460:8:8 is not equal to
-vop crop=704:460:8:8,scale=640:352? I couldn't find anything about this
in docs (Please, don't blame me, I didn't find it, I don't say it is not
there).

By the way, the first case is a real one; the resulting movie looks 
fine (well almost fine, there is a problem that I submit to the list)
but this values  don't verify your relation but I think they are the usual
values

640/352=1.81

16/9 * 480/720 * 704/460 = 2.05

(may be 460 is not multiple of 16?)

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