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<TITLE>Video Hook Documentation</TITLE>
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<H1> 1. Introduction </H1>
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<P>
The video hook functionality is designed (mostly) for live video. It allows
the video to be modified or examined between the decoder and the encoder.
</P>
<P>
Any number of hook modules can be placed inline, and they are run in the
order that they were specified on the ffmpeg command line.
</P>
<P>
Three modules are provided and are described below. They are all intended to
be used as a base for your own modules.
</P>
<P>
Modules are loaded using the -vhook option to ffmpeg. The value of this parameter
is a space seperated list of arguments. The first is the module name, and the rest
are passed as arguments to the Configure function of the module.
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<H2> 1.1 null.c </H2>
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<P>
This does nothing. Actually it converts the input image to RGB24 and then converts
it back again. This is meant as a sample that you can use to test your setup.
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<H2> 1.2 fish.c </H2>
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<P>
This implements a 'fish detector'. Essentially it converts the image into HSV
space and tests whether more than a certain percentage of the pixels fall into
a specific HSV cuboid. If so, then the image is saved into a file for processing
by other bits of code.
</P>
<P>
Why use HSV? It turns out that HSV cuboids represent a more compact range of
colors than would an RGB cuboid.
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<H2> 1.3 imlib2.c </H2>
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<P>
This allows a caption to be placed onto each frame. It supports inserting the
time and date. By using the imlib functions, it would be easy to add your own
graphical logo, add a frame/border, etc.
</P>
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<H1>Table of Contents</H1>
<BLOCKQUOTE>
<A NAME="TOC1" HREF="hooks.html#SEC1">1. Introduction</A>
<BR>
<BLOCKQUOTE>
<A NAME="TOC2" HREF="hooks.html#SEC2">1.1 null.c</A>
<BR>
<A NAME="TOC3" HREF="hooks.html#SEC3">1.2 fish.c</A>
<BR>
<A NAME="TOC4" HREF="hooks.html#SEC4">1.3 imlib2.c</A>
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<H1>Short Table of Contents</H1>
<BLOCKQUOTE>
<A NAME="TOC1" HREF="hooks.html#SEC1">1. Introduction</A>
<BR>
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<H1>About this document</H1>
This document was generated
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where the <STRONG> Example </STRONG> assumes that the current position
is at <STRONG> Subsubsection One-Two-Three </STRONG> of a document of
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