avfilter/vf_lut: add support for commands

While here remove excessive log and uninit() call in negate_init().

1 files changed, 8 insertions, 0 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index 121a9847e1..891e8c4544 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -14114,6 +14114,10 @@ expression
 
 All expressions default to "val".
 
+@subsection Commands
+
+This filter supports same @ref{commands} as options.
+
 @subsection Examples
 
 @itemize
@@ -14776,6 +14780,10 @@ It accepts the following option:
 With value 1, it negates the alpha component, if present. Default value is 0.
 @end table
 
+@subsection Commands
+
+This filter supports same @ref{commands} as options.
+
 @anchor{nlmeans}
 @section nlmeans