@settitle Libavfilter Documentation
@titlepage
-@sp 7
@center @titlefont{Libavfilter Documentation}
-@sp 3
@end titlepage
+@top
+
+@contents
@chapter Introduction
-Libavfilter is the filtering API of FFmpeg. It is the substitute of the
+Libavfilter is the filtering API of Libav. It is the substitute of the
now deprecated 'vhooks' and started as a Google Summer of Code project.
-Integrating libavfilter into the main FFmpeg repository is a work in
-progress. If you wish to try the unfinished development code of
-libavfilter then check it out from the libavfilter repository into
-some directory of your choice by:
-
-@example
- svn checkout svn://svn.ffmpeg.org/soc/libavfilter
-@end example
-
-And then read the README file in the top directory to learn how to
-integrate it into ffmpeg and ffplay.
-
But note that there may still be serious bugs in the code and its API
and ABI should not be considered stable yet!
overlaying it on top. You can use the following command to achieve this:
@example
-./ffmpeg -i in.avi -s 240x320 -vf "[in] split [T1], fifo, [T2] overlay= 0:240 [out]; [T1] fifo, crop=0:0:-1:240, vflip [T2]
+./avconv -i input -vf "[in] split [T1], fifo, [T2] overlay=0:H/2 [out]; [T1] fifo, crop=iw:ih/2:0:ih/2, vflip [T2]" output
@end example
-where input_video.avi has a vertical resolution of 480 pixels. The
-result will be that in output the top half of the video is mirrored
+The result will be that in output the top half of the video is mirrored
onto the bottom half.
Video filters are loaded using the @var{-vf} option passed to
-ffmpeg or to ffplay. Filters in the same linear chain are separated by
+avconv or to avplay. Filters in the same linear chain are separated by
commas. In our example, @var{split, fifo, overlay} are in one linear
chain, and @var{fifo, crop, vflip} are in another. The points where
the linear chains join are labeled by names enclosed in square
@chapter graph2dot
-The @file{graph2dot} program included in the FFmpeg @file{tools}
+The @file{graph2dot} program included in the Libav @file{tools}
directory can be used to parse a filter graph description and issue a
corresponding textual representation in the dot language.
can be used to create and display an image representing the graph
described by the @var{GRAPH_DESCRIPTION} string.
-@chapter Available video filters
-
-When you configure your FFmpeg build, you can disable any of the
-existing video filters.
-The configure output will show the video filters included in your
-build.
-
-Below is a description of the currently available video filters.
-
-@section crop
-
-Crop the input video to @var{x}:@var{y}:@var{width}:@var{height}.
-
-@example
-./ffmpeg -i in.avi -vf "crop=0:0:0:240" out.avi
-@end example
-
-@var{x} and @var{y} specify the position of the top-left corner of the
-output (non-cropped) area.
-
-The default value of @var{x} and @var{y} is 0.
-
-The @var{width} and @var{height} parameters specify the width and height
-of the output (non-cropped) area.
-
-A value of 0 is interpreted as the maximum possible size contained in
-the area delimited by the top-left corner at position x:y.
-
-For example the parameters:
-
-@example
-"crop=100:100:0:0"
-@end example
-
-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 @var{width} and @var{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 -vf "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 -vf "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 pad
-
-Add paddings to the input image, and places the original input at the
-given coordinates @var{x}, @var{y}.
-
-It accepts the following parameters:
-@var{width}:@var{height}:@var{x}:@var{y}:@var{color}.
-
-Follows the description of the accepted parameters.
-
-@table @option
-@item width, height
-
-Specify the size of the output image with the paddings added. If the
-value for @var{width} or @var{height} is 0, the corresponding input size
-is used for the output.
-
-The default value of @var{width} and @var{height} is 0.
-
-@item x, y
-
-Specify the offsets where to place the input image in the padded area
-with respect to the top/left border of the output image.
-
-The default value of @var{x} and @var{y} is 0.
-
-@item color
-
-Specify the color of the padded area, it can be the name of a color
-(case insensitive match) or a 0xRRGGBB[AA] sequence.
-
-The default value of @var{color} is ``black''.
-
-@end table
-
-@section scale
-
-Scale the input video to @var{width}:@var{height} and/or convert the image format.
-
-For example the command:
-
-@example
-./ffmpeg -i in.avi -vf "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 @var{width} or @var{height} is 0, the respective input
-size is used for the output.
-
-If the value for @var{width} or @var{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 @var{width} and @var{height} is 0.
-
-@section slicify
-
-Pass the images of input video on to next video filter as multiple
-slices.
-
-@example
-./ffmpeg -i in.avi -vf "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 unsharp
-
-Sharpen or blur the input video. It accepts the following parameters:
-
-@multitable @columnfractions .2 .5 .1 .1 .1
-@headitem Name @tab Description @tab Min @tab Max @tab Default
-@item @var{luma_msize_x}
-@tab Luma matrix horizontal size
-@tab 3
-@tab 13
-@tab 5
-@item @var{luma_msize_y}
-@tab Luma matrix vertical size
-@tab 3
-@tab 13
-@tab 5
-@item @var{luma_amount}
-@tab Luma effect strength
-@tab -2.0
-@tab 5.0
-@tab 1.0
-@item @var{chroma_msize_x}
-@tab Chroma matrix horizontal size
-@tab 3
-@tab 13
-@tab 0
-@item @var{chroma_msize_y}
-@tab Chroma matrix vertical size
-@tab 3
-@tab 13
-@tab 0
-@item @var{chroma_amount}
-@tab Chroma effect strength
-@tab -2.0
-@tab 5.0
-@tab 0.0
-@end multitable
-
-Negative values for the amount will blur the input video, while positive
-values will sharpen. All parameters are optional and default to the
-equivalent of the string '5:5:1.0:0:0:0.0'.
-
-@example
-# Strong luma sharpen effect parameters
-unsharp=7:7:2.5
-
-# Strong blur of both luma and chroma parameters
-unsharp=7:7:-2:7:7:-2
-
-# Use the default values with @command{ffmpeg}
-./ffmpeg -i in.avi -vf "unsharp" out.mp4
-@end example
-
-@section vflip
-
-Flip the input video vertically.
-
-@example
-./ffmpeg -i in.avi -vf "vflip" out.avi
-@end example
-
-@chapter Available video sources
-
-Below is a description of the currently available video sources.
-
-@section nullsrc
-
-Null video source, never return images. It is mainly useful as a
-template and to be employed in analysis / debugging tools.
-
-It accepts as optional parameter a string of the form
-@var{width}:@var{height}, where @var{width} and @var{height} specify the size of
-the configured source.
-
-The default values of @var{width} and @var{height} are respectively 352
-and 288 (corresponding to the CIF size format).
-
-@chapter Available video sinks
-
-Below is a description of the currently available video sinks.
-
-@section nullsink
-
-Null video sink, do absolutely nothing with the input video. It is
-mainly useful as a template and to be employed in analysis / debugging
-tools.
+@include filters.texi
@bye
projects / ffmpeg / blobdiff