documentation: extend documentation for ffmpeg -aspect option

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

diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
index 0d12f65f02aeaa0da2b8cef88ac9972cd99e9d30..cabf39558245b338bf7943c14f0976bd48f14af1 100644 (file)
--- 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}.
+
+@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}