[MPlayer-dev-eng] -vop scale

[Kim Minh Kaplan]

Hello,

I recently started using -vop scale=640:-2,crop=... instead of
calculating the scaled width myself.  But the code in vf_scale.c is
not restrictive enough: it can result in dimensions (height here) that
are not usable because it is not even.  So I came up with the
attached patch which does the job quite well and rounds to the nearest even height.

I want to commit this but to be complete I have to do the same thing
for the width.  But what value does it have to be a multiple of? 8, 16
or 32?

Kim Minh.
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