[MPlayer-users] seeking explanation of -1 and -2 in -vop scale
Chris Phillips
chris at thirtythreeandathird.net
Wed Sep 18 14:40:01 CEST 2002
hi, can someone briefly state precisely what -2 and -1 actually DO mean in
the -vop scale filter? i know they preserve aspect ratios (scale=640:-2)
but their behaviour seems confusing? what is the difference? how does
cropping an image before scaling (scale=640:-2,crop=720:436:4:740) affect
this -2 or -1 status?
Also is it better to crop then scale or scale then crop? for a perl script
i'm writing i really want to scale afterwards, but have found that many
times i've tried to scale a cropped image it has been scaled relative to
the original dimensions and aspect information, not the new size.
any information greatly recieved
thanks
chris
xxxx
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