[FFmpeg-devel] [PATCH] doc/filters: extend syntax description for transpose, and add examples

Stefano Sabatini stefasab at gmail.com
Wed Dec 12 12:37:07 CET 2012

 doc/filters.texi |   18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/doc/filters.texi b/doc/filters.texi
index b9b0ded..e4c16b6 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -3886,7 +3886,12 @@ Default mode is @code{merge}.
 Transpose rows with columns in the input video and optionally flip it.
-This filter accepts the following named parameters:
+The filter accepts parameters as a list of @var{key}=@var{value}
+pairs, separated by ":". If the key of the first options is omitted,
+the arguments are interpreted according to the following syntax:
+ at example
+ at end example
 @table @option
 @item dir
@@ -3945,6 +3950,17 @@ Preserve landscape geometry (when @var{width} >= @var{height}).
 Default value is @code{none}.
 @end table
+For example to rotate by 90 degrees clockwise and preserve portrait
+ at example
+ at end example
+The command above can also be specified as:
+ at example
+ at end example
 @section unsharp
 Sharpen or blur the input video.

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