[FFmpeg-cvslog] doc: add vf_crop keepaspect documentation

[Stefano Sabatini]

ffmpeg | branch: master | Stefano Sabatini <stefasab at gmail.com> | Sun Mar 11 17:47:06 2012 +0100| [4272dc3ec5c56c46e88366c9a49a9a6aceb36e12] | committer: Michael Niedermayer

doc: add vf_crop keepaspect documentation

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4272dc3ec5c56c46e88366c9a49a9a6aceb36e12
---

 doc/filters.texi |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/doc/filters.texi b/doc/filters.texi
index b13d5f5..063cc13 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -903,9 +903,14 @@ testing purposes.
 
 @section crop
 
-Crop the input video to @var{out_w}:@var{out_h}:@var{x}:@var{y}.
+Crop the input video to @var{out_w}:@var{out_h}:@var{x}:@var{y}:@var{keep_aspect}
 
-The parameters are expressions containing the following constants:
+The @var{keep_aspect} parameter is optional, if specified and set to a
+non-zero value will force the output display aspect ratio to be the
+same of the input, by changing the output sample aspect ratio.
+
+The @var{out_w}, @var{out_h}, @var{x}, @var{y} parameters are
+expressions containing the following constants:
 
 @table @option
 @item x, y