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doc: add vf_crop keepaspect documentation
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -903,9 +903,14 @@ testing purposes.
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@section crop
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@section crop
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Crop the input video to @var{out_w}:@var{out_h}:@var{x}:@var{y}.
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Crop the input video to @var{out_w}:@var{out_h}:@var{x}:@var{y}:@var{keep_aspect}
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The parameters are expressions containing the following constants:
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The @var{keep_aspect} parameter is optional, if specified and set to a
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non-zero value will force the output display aspect ratio to be the
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same of the input, by changing the output sample aspect ratio.
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The @var{out_w}, @var{out_h}, @var{x}, @var{y} parameters are
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expressions containing the following constants:
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@table @option
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@table @option
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@item x, y
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@item x, y
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