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lavfi/delogo: Document where parameter show=1 draws its rectangle 

It is not completely obvious where delogo's parameter show=1 draws its
rectangle. Document it so that the user can more easily tune the
parameters.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Jean Delvare 2013-07-13 16:51:09 +02:00 committed by Michael Niedermayer
parent b6d0bb6086
commit 9e4bb09140
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@ -2854,6 +2854,11 @@ When set to 1, a green rectangle is drawn on the screen to simplify
finding the right @var{x}, @var{y}, @var{w}, and @var{h} parameters.
The default value is 0.
The rectangle is drawn on the outermost pixels which will be (partly)
replaced with interpolated values. The values of the next pixels
immediately outside this rectangle in each direction will be used to
compute the interpolated pixel values inside the rectangle.
@end table
@subsection Examples