doc: Clarify documentation for fade duration.

6453fddb · Carl Eugen Hoyos · 4a94f7b2 · 6453fddb
Commit 6453fddb authored Mar 09, 2015 by Carl Eugen Hoyos
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filters.texi doc/filters.texi +2 -1

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--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -4538,7 +4538,8 @@ 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".