vf_gradfun: switch to an AVOptions-based system.

1 files changed, 16 insertions, 12 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index 51f7833216..f4f5cf5a27 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1174,23 +1174,27 @@ This filter is designed for playback only.  Do not use it prior to
 lossy compression, because compression tends to lose the dither and
 bring back the bands.
 
-The filter takes two optional parameters, separated by ':':
-@var{strength}:@var{radius}
+This filter accepts the following options:
+
+@table @option
 
-@var{strength} is the maximum amount by which the filter will change
-any one pixel. Also the threshold for detecting nearly flat
-regions. Acceptable values range from .51 to 64, default value is
-1.2, out-of-range values will be clipped to the valid range.
+@item strength
+The maximum amount by which the filter will change any one pixel. Also the
+threshold for detecting nearly flat regions. Acceptable values range from .51 to
+64, default value is 1.2, out-of-range values will be clipped to the valid
+range.
 
-@var{radius} is the neighborhood to fit the gradient to. A larger
-radius makes for smoother gradients, but also prevents the filter from
-modifying the pixels near detailed regions. Acceptable values are
-8-32, default value is 16, out-of-range values will be clipped to the
-valid range.
+@item radius
+The neighborhood to fit the gradient to. A larger radius makes for smoother
+gradients, but also prevents the filter from modifying the pixels near detailed
+regions. Acceptable values are 8-32, default value is 16, out-of-range values
+will be clipped to the valid range.
+
+@end table
 
 @example
 # default parameters
-gradfun=1.2:16
+gradfun=strength=1.2:radius=16
 
 # omitting radius
 gradfun=1.2