apedec: Convert to the new bitstream reader

[ffmpeg] / doc / libavfilter.texi

diff --git a/doc/libavfilter.texi b/doc/libavfilter.texi
index 1c1220541cf2f691529fe87c704e41cccc0481f5..84bad29dab28c82261e8e10ec1cfb9005feeee70 100644 (file)
--- a/doc/libavfilter.texi
+++ b/doc/libavfilter.texi
@@ -11,22 +11,10 @@
 
 @chapter Introduction
 
-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.
+Libavfilter is the filtering API of Libav. It replaces 'vhooks', and
+started as a Google Summer of Code project.
 
-Integrating libavfilter into the main Libav 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.libav.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
+Note that there may still be serious bugs in the code and its API
 and ABI should not be considered stable yet!
 
 @chapter Tutorial
@@ -43,34 +31,33 @@ input --> split --> fifo -----------------------> overlay --> output
             +------> fifo --> crop --> vflip --------+
 @end example
 
-splits the stream in two streams, sends one stream through the crop filter
-and the vflip filter before merging it back with the other stream by
+splits the stream in two streams, then sends one stream through the crop filter
+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
-./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
-onto the bottom half.
+The result will be that the top half of the video is mirrored
+onto the bottom half of the output video.
 
 Video filters are loaded using the @var{-vf} option passed to
-ffmpeg or to ffplay. 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
-brackets. In our example, that is @var{[T1]} and @var{[T2]}. The magic
+avconv or to avplay. Filters in the same linear chain are separated by
+commas. In our example, @var{split}, @var{fifo}, and @var{overlay} are in one
+linear chain, and @var{fifo}, @var{crop}, and @var{vflip} are in another. The
+points where the linear chains join are labeled by names enclosed in square
+brackets. In our example, they join at @var{[T1]} and @var{[T2]}. The magic
 labels @var{[in]} and @var{[out]} are the points where video is input
 and output.
 
-Some filters take in input a list of parameters: they are specified
-after the filter name and an equal sign, and are separated each other
+Some filters take a list of parameters: they are specified
+after the filter name and an equal sign, and are separated
 by a semicolon.
 
-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.
+There are so-called @var{source filters} that do not take video
+input, and we expect that some @var{sink filters} will
+not have video output, at some point in the future.
 
 @chapter graph2dot