X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=doc%2Flibavfilter.texi;h=0e473fdfee676b02dafce827c157e677f73a56bd;hb=60a92a77f317442307766a8f311ccf5a08d28986;hp=db21d7fdf2444ee9b271488b61a2cb89e35ec307;hpb=debfab4a0d3636181caef90a4f7942263591e49e;p=ffmpeg

diff --git a/doc/libavfilter.texi b/doc/libavfilter.texi
index db21d7fdf24..0e473fdfee6 100644
--- a/doc/libavfilter.texi
+++ b/doc/libavfilter.texi
@@ -109,10 +109,92 @@ will delimit the rectangle with the top-left corner placed at position
 100:100 and the right-bottom corner corresponding to the right-bottom
 corner of the input image.
 
-The default value of ``w'' and ``h'' is 0.
+The default value of ``width'' and ``height'' is 0.
+
+@section format
+
+Convert the input video to one of the specified pixel formats.
+Libavfilter will try to pick one that is supported for the input to
+the next filter.
+
+The filter accepts a list of pixel format names, separated by ``:'',
+for example ``yuv420p:monow:rgb24''.
+
+The following command:
+
+@example
+./ffmpeg -i in.avi -vfilters "format=yuv420p" out.avi
+@end example
+
+will convert the input video to the format ``yuv420p''.
+
+@section noformat
+
+Force libavfilter not to use any of the specified pixel formats for the
+input to the next filter.
+
+The filter accepts a list of pixel format names, separated by ``:'',
+for example ``yuv420p:monow:rgb24''.
+
+The following command:
+
+@example
+./ffmpeg -i in.avi -vfilters "noformat=yuv420p, vflip" out.avi
+@end example
+
+will make libavfilter use a format different from ``yuv420p'' for the
+input to the vflip filter.
 
 @section null
 
 Pass the source unchanged to the output.
 
+@section scale
+
+Scale the input video to width:height and/or convert the image format.
+
+For example the command:
+
+@example
+./ffmpeg -i in.avi -vfilters "scale=200:100" out.avi
+@end example
+
+will scale the input video to a size of 200x100.
+
+If the input image format is different from the format requested by
+the next filter, the scale filter will convert the input to the
+requested format.
+
+If the value for ``width'' or ``height'' is 0, the respective input
+size is used for the output.
+
+If the value for ``width'' or ``height'' is -1, the scale filter will
+use, for the respective output size, a value that maintains the aspect
+ratio of the input image.
+
+The default value of ``width'' and ``height'' is 0.
+
+@section slicify
+
+Pass the images of input video on to next video filter as multiple
+slices.
+
+@example
+./ffmpeg -i in.avi -vfilters "slicify=32" out.avi
+@end example
+
+The filter accepts the slice height as parameter. If the parameter is
+not specified it will use the default value of 16.
+
+Adding this in the beginning of filter chains should make filtering
+faster due to better use of the memory cache.
+
+@section vflip
+
+Flip the input video vertically.
+
+@example
+./ffmpeg -i in.avi -vfilters "vflip" out.avi
+@end example
+
 @bye