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diff --git a/vhook/hooks.html b/vhook/hooks.html new file mode 100644 index 0000000000..750d15cc92 --- /dev/null +++ b/vhook/hooks.html @@ -0,0 +1,95 @@ +<HTML> +<HEAD> +<!-- This HTML file has been created by texi2html 1.51 + from hooks.texi on 20 November 2002 --> + +<TITLE>Video Hook Documentation</TITLE> +</HEAD> +<BODY> +<H1>Video Hook Documentation</H1> +<P> +<P><HR><P> +<H1>Table of Contents</H1> +<UL> +<LI><A NAME="TOC1" HREF="hooks.html#SEC1">1 Introduction</A> +<UL> +<LI><A NAME="TOC2" HREF="hooks.html#SEC2">1.1 null.c</A> +<LI><A NAME="TOC3" HREF="hooks.html#SEC3">1.2 fish.c</A> +<LI><A NAME="TOC4" HREF="hooks.html#SEC4">1.3 imlib2.c</A> +</UL> +</UL> +<P><HR><P> + +<P> +Video Hook Documentation +<P> + +</P> + + + +<H1><A NAME="SEC1" HREF="hooks.html#TOC1">1 Introduction</A></H1> + +<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. + +</P> + + +<H2><A NAME="SEC2" HREF="hooks.html#TOC2">1.1 null.c</A></H2> + +<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. + +</P> + + +<H2><A NAME="SEC3" HREF="hooks.html#TOC3">1.2 fish.c</A></H2> + +<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. + +</P> + + +<H2><A NAME="SEC4" HREF="hooks.html#TOC4">1.3 imlib2.c</A></H2> + +<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> + +<P><HR><P> +This document was generated on 20 November 2002 using the +<A HREF="http://wwwcn.cern.ch/dci/texi2html/">texi2html</A> +translator version 1.51.</P> +</BODY> +</HTML> |