Hi!
I believe attached patch improves the fade documentation.
Please comment, Carl Eugen
diff --git a/doc/filters.texi b/doc/filters.texi
index 191b52f..d394aec 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -4503,7 +4503,8 @@ The number of seconds 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 filled with the
selected @option{color}.
-If both duration and nb_frames are specified, duration is used. Default is 0.
+If both duration and nb_frames are specified, duration is used. Default is 0
+(nb_frames is used by default).
@item color, c
Specify the color of the fade. Default is "black".
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