indeo4: update AVCodecContext width/height on size change

[ffmpeg] / doc / libavfilter.texi

diff --git a/doc/libavfilter.texi b/doc/libavfilter.texi
index 9efeba2f68ca063b7b4d705e85f19fa3fa9f77b1..b452294a5ff8aa0099a338aafe167bf83401b0d8 100644 (file)
--- a/doc/libavfilter.texi
+++ b/doc/libavfilter.texi
@@ -2,29 +2,18 @@
 
 @settitle Libavfilter Documentation
 @titlepage
 
 @settitle Libavfilter Documentation
 @titlepage

-@sp 7

 @center @titlefont{Libavfilter Documentation}
 @center @titlefont{Libavfilter Documentation}

-@sp 3

 @end titlepage
 
 @end titlepage
 

+@top
+
+@contents

 
 @chapter Introduction
 
 
 @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.
 
 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!
 
 But note that there may still be serious bugs in the code and its API
 and ABI should not be considered stable yet!
 


@@ -47,15 +36,14 @@ and the vflip filter before merging it back with the other stream by
 overlaying it on top. You can use the following command to achieve this:
 
 @example
 overlaying it on top. You can use the following command to achieve this:
 
 @example

-./ffmpeg -i in.avi -s 240x320 -vfilters "[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
 
 @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.
 
 onto the bottom half.
 

-Video filters are loaded using the @var{-vfilters} option passed to
-ffmpeg or to ffplay. Filters in the same linear chain are separated by
+Video filters are loaded using the @var{-vf} option passed to
+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
 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


@@ -71,90 +59,34 @@ There exist so-called @var{source filters} that do not have a video
 input, and we expect in the future some @var{sink filters} that will
 not have video output.
 
 input, and we expect in the future some @var{sink filters} that will
 not have video output.
 

-@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
+@chapter graph2dot

 
 

-Crop the input video to x:y:width:height.
+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.

 
 

+Invoke the command:

 @example
 @example

-./ffmpeg -i in.avi -vfilters "crop=0:0:0:240" out.avi
+graph2dot -h

 @end example
 
 @end example
 

-``x'' and ``y'' specify the position of the top-left corner of the
-output (non-cropped) area.
+to see how to use @file{graph2dot}.

 
 

-The default value of ``x'' and ``y'' is 0.
-
-The ``width'' and ``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:
+You can then pass the dot description to the @file{dot} program (from
+the graphviz suite of programs) and obtain a graphical representation
+of the filter graph.

 
 

+For example the sequence of commands:

 @example
 @example

-"crop=100:100:0:0"
+echo @var{GRAPH_DESCRIPTION} | \
+tools/graph2dot -o graph.tmp && \
+dot -Tpng graph.tmp -o graph.png && \
+display graph.png

 @end example
 
 @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 ``width'' and ``height'' is 0.
-
-@section format
+can be used to create and display an image representing the graph
+described by the @var{GRAPH_DESCRIPTION} string.

 
 

-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 vflip
-
-Flip the input video vertically.
-
-@example
-./ffmpeg -i in.avi -vfilters "vflip" out.avi
-@end example
+@include filters.texi

 
 @bye
 
 @bye