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doc: add vf_crop keepaspect documentation 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Stefano Sabatini 2012-03-11 17:47:06 +01:00 committed by Michael Niedermayer
parent f49cb8e669
commit 4272dc3ec5
1 changed files with 7 additions and 2 deletions
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9
doc/filters.texi
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@ -903,9 +903,14 @@ testing purposes.
@section crop
Crop the input video to @var{out_w}:@var{out_h}:@var{x}:@var{y}.
Crop the input video to @var{out_w}:@var{out_h}:@var{x}:@var{y}:@var{keep_aspect}
The parameters are expressions containing the following constants:
The @var{keep_aspect} parameter is optional, if specified and set to a
non-zero value will force the output display aspect ratio to be the
same of the input, by changing the output sample aspect ratio.
The @var{out_w}, @var{out_h}, @var{x}, @var{y} parameters are
expressions containing the following constants:
@table @option
@item x, y