[FFmpeg-cvslog] doc: Clarify documentation for fade duration.

[Carl Eugen Hoyos]

ffmpeg | branch: master | Carl Eugen Hoyos <cehoyos at ag.or.at> | Mon Mar  9 10:57:58 2015 +0100| [6453fddb58a0728156876e4119e69241d9a8cc6f] | committer: Carl Eugen Hoyos

doc: Clarify documentation for fade duration.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6453fddb58a0728156876e4119e69241d9a8cc6f
---

 doc/filters.texi |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/doc/filters.texi b/doc/filters.texi
index a2c8a0a..dbcd391 100644
--- 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".