[FFmpeg-cvslog] documentation: extend documentation for ffmpeg -aspect option

[Stefano Sabatini]

ffmpeg | branch: master | Stefano Sabatini <stefano.sabatini-lala at poste.it> | Sat Apr  9 13:49:49 2011 +0200| [4bc282322ba1c03ed98737740f6b5e17b604ffa1] | committer: Anton Khirnov

documentation: extend documentation for ffmpeg -aspect option

Signed-off-by: Anton Khirnov <anton at khirnov.net>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4bc282322ba1c03ed98737740f6b5e17b604ffa1
---

 doc/ffmpeg.texi |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
index 0d12f65..cabf395 100644
--- a/doc/ffmpeg.texi
+++ b/doc/ffmpeg.texi
@@ -230,7 +230,13 @@ The following abbreviations are recognized:
 @end table
 
 @item -aspect @var{aspect}
-Set aspect ratio (4:3, 16:9 or 1.3333, 1.7777).
+Set the video display aspect ratio specified by @var{aspect}.
+
+ at var{aspect} can be a floating point number string, or a string of the
+form @var{num}:@var{den}, where @var{num} and @var{den} are the
+numerator and denominator of the aspect ratio. For example "4:3",
+"16:9", "1.3333", and "1.7777" are valid argument values.
+
 @item -croptop @var{size}
 @item -cropbottom @var{size}
 @item -cropleft @var{size}