[MPlayer-users] Problem with 'scale' negative options.

[D Richard Felker III]

On Thu, Oct 21, 2004 at 07:23:18PM -0700, RC wrote:
> This really isn't a bug, more like a limited feature...
> 
> Scale's negative options are very useful, but they don't always work. 
> '-2' works fine if you want to adjust the height of a video, but not the
> width.
> 
> For instance, I sometimes use:  -vf scale=-1:-2
> Scaling the height to match the width, compensating for aspect.
> 
> Unfortunately, -2 doesn't work in place of width, unless you manually
> specify height:  -vf scale=-2:480
> 
> The above works, but requires you to know the pre-scaled height ahead of
> time, which isn't always possible.  
> 
> I would expect any of the following should work, but do not:
> scale=-2:-1
> scale=-2:0
> scale=-2
> 
> I've also tried every different combination of the negative options,
> but never have success.  Is there some workaround?  Is the limitation
> ever going to be fixed?

i'm very confused how these would be useful. it seems like -vf scale
with no options will do about the same as what you want in most of
these cases. if you want these extended options you described to work,
please submit a patch. as long as it's clean and not buggy it should
be accepted.

rich