vf_fade: switch to an AVOptions-based system.

1 files changed, 18 insertions, 14 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index 27b6093..0cbbe6b 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1000,33 +1000,37 @@ For more information about libfreetype, check:
 
 Apply fade-in/out effect to input video.
 
-It accepts the parameters:
-@var{type}:@var{start_frame}:@var{nb_frames}
+This filter accepts the following options:
+
+@table @option
 
-@var{type} specifies if the effect type, can be either "in" for
-fade-in, or "out" for a fade-out effect.
+@item type
+The effect type -- can be either "in" for fade-in, or "out" for a fade-out
+effect.
+
+@item start_frame
+The number of the start frame for starting to apply the fade effect.
 
-@var{start_frame} specifies the number of the start frame for starting
-to apply the fade effect.
+@item nb_frames
+The number of frames for which the fade effect has to last. At the end of the
+fade-in effect the output video will have the same intensity as the input video,
+at the end of the fade-out transition the output video will be completely black.
 
-@var{nb_frames} specifies the number of frames for which the fade
-effect has to last. At the end of the fade-in effect the output video
-will have the same intensity as the input video, at the end of the
-fade-out transition the output video will be completely black.
+@end table
 
 A few usage examples follow, usable too as test scenarios.
 @example
 # fade in first 30 frames of video
-fade=in:0:30
+fade=type=in:nb_frames=30
 
 # fade out last 45 frames of a 200-frame video
-fade=out:155:45
+fade=type=out:start_frame=155:nb_frames=45
 
 # fade in first 25 frames and fade out last 25 frames of a 1000-frame video
-fade=in:0:25, fade=out:975:25
+fade=type=in:start_frame=0:nb_frames=25, fade=type=out:start_frame=975:nb_frames=25
 
 # make first 5 frames black, then fade in from frame 5-24
-fade=in:5:20
+fade=type=in:start_frame=5:nb_frames=20
 @end example
 
 @section fieldorder