doc/swscaler: explain default Lanczos parameter

Explain that the default Lanczos filter parameter is 3 and that it can be
changed by the param0 option.

Signed-off-by: Werner Robitza <werner.robitza@gmail.com>
This commit is contained in:
Werner Robitza 2019-05-26 17:52:00 +02:00 committed by Gyan Doshi
parent 254da41531
commit 7458fa119c

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@ -48,7 +48,8 @@ Select Gaussian rescaling algorithm.
Select sinc rescaling algorithm.
@item lanczos
Select Lanczos rescaling algorithm.
Select Lanczos rescaling algorithm. The default width (alpha) is 3 and can be
changed by setting @code{param0}.
@item spline
Select natural bicubic spline rescaling algorithm.