avfilter/vf_zscale: add support for setting scaling filter parameters

param_a/b are utilized for this.

1 files changed, 7 insertions, 0 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index 50aa0eb305..152e806fdd 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -22393,6 +22393,13 @@ Possible values are:
 
 @item npl
 Set the nominal peak luminance.
+
+@item param_a
+Parameter A for scaling filters. Parameter "b" for bicubic, and the number of
+filter taps for lanczos.
+
+@item param_b
+Parameter B for scaling filters. Parameter "c" for bicubic.
 @end table
 
 The values of the @option{w} and @option{h} options are expressions