[FFmpeg-user] How to achieve old -croptop
coniophora at gmail.com
Sat Sep 3 18:44:52 CEST 2011
On Sep 3, 2011, at 9:00 AM, orang Aumori Jepun wrote:
> Hi all.
> I recently installed the latest ffmpeg.
> And I noticed the parameters are little bit changed from
> the old debian ones.
> Now , I want to know how to achieve the old style
> ffmpeg -i INFILE.mpg -croptop 50 test.mpg
> with the latest ffmpeg ( as of 27.Aug.2011)?
> I'm not a native English speaker and I can not succeed in
> understanging the latest ffmpeg man page.
> So , someone please help me understand set up the
> parameter for the latest ffmpeg.
As I understand,
out_w is the width in pixels of the final output you want
out_h is the height in pixels of the final output you want
and these are based on the ORIGINAL frame:
x is the pixel position, counting from the left side of the original frame,
of the left side of the frame you want to keep
y is the pixel position, counting from the top of the original frame,
of the top side of the frame you want to keep
So, for example,
-vf crop=640:480:60:40 will find the point that is 60 pixels from the
left side of the original and 40 pixels from the top of the original,
and then save a frame that is 640x480 from there, with that point as
the upper left corner.
If x and y are not given, it defaults to centering the final frame
in the original frame.
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