[MPlayer-users] probably my usual stupid question of the week
Aaron Peterson
aaron at alpete.com
Fri Apr 16 17:03:12 CEST 2004
> Crop should probably go first. No need to use -xy and -zoom. They're
> rather strange. Just use -vf crop=...,scale=w:h and fill in the width
> and height to use. There are tricks to get mencoder to compute them
> for you, but it won't align them at multiple-of-16 boundaries so
> you're best to just figure out the right size yourself. Normally it's
> 640x272 (2.35:1), 640x288, 640x352 / 640x368 (16:9), or 640x480 (4:3).
Okay, so the original video is 720x480, aspect 1.78:1. So I ran
cropdetect, and it tells me it wants to crop a picture 720 x 366. So I
calculate the equivalent 640 x N ratio, and N=325 (almost). Anyway, this
is not a multiple of 16, so I divide by 16 which is 20 something, then
multiply 16 by 20 to get 320. So I just want to confirm that this is the
correct method to go about all this, I would want to scale to 640x320? Or
should I use one of the measurements you gave above instead? If I should
use one of the above, how would I have figured out which one?
If I didn't want to scale down the video, but did want to preserve the
aspect in a way that most players understand, do i need to use
scale=720xXXX ?
Aaron
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