[FFmpeg-cvslog] doc/swscaler: explain default Lanczos parameter

[Werner Robitza]

ffmpeg | branch: master | Werner Robitza <werner.robitza at gmail.com> | Sun May 26 17:52:00 2019 +0200| [7458fa119c907bc43dd10e2ecdaaad1483e5920d] | committer: Gyan Doshi

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 at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7458fa119c907bc43dd10e2ecdaaad1483e5920d
---

 doc/scaler.texi | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/doc/scaler.texi b/doc/scaler.texi
index f1b9bba3b4..eb045de6b7 100644
--- a/doc/scaler.texi
+++ b/doc/scaler.texi
@@ -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.