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| 3 | <!-- Created on June, 30 2006 by texi2html 1.76 -->
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| 5 | Written by: Lionel Cons <[email protected]> (original author)
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| 6 | Karl Berry <[email protected]>
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| 7 | Olaf Bachmann <[email protected]>
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| 13 | <head>
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| 14 | <title>Video Hook Documentation: 1. Introduction</title>
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| 15 |
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| 16 | <meta name="description" content="Video Hook Documentation: 1. Introduction">
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| 17 | <meta name="keywords" content="Video Hook Documentation: 1. Introduction">
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| 39 | </head>
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| 40 |
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| 41 | <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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| 42 |
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| 43 | <a name="SEC1"></a>
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| 44 | <table cellpadding="1" cellspacing="1" border="0">
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| 45 | <tr><td valign="middle" align="left">[ < ]</td>
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| 46 | <td valign="middle" align="left">[<a href="#SEC2" title="Next section in reading order"> > </a>]</td>
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| 47 | <td valign="middle" align="left"> </td>
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| 48 | <td valign="middle" align="left">[ << ]</td>
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| 49 | <td valign="middle" align="left">[ Up ]</td>
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| 50 | <td valign="middle" align="left">[ >> ]</td>
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| 51 | <td valign="middle" align="left"> </td>
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| 52 | <td valign="middle" align="left"> </td>
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| 53 | <td valign="middle" align="left"> </td>
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| 54 | <td valign="middle" align="left"> </td>
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| 55 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
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| 56 | <td valign="middle" align="left">[Contents]</td>
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| 57 | <td valign="middle" align="left">[Index]</td>
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| 58 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
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| 59 | </tr></table>
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| 60 | <h1 class="chapter"> 1. Introduction </h1>
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| 61 |
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| 62 |
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| 63 | <p>The video hook functionality is designed (mostly) for live video. It allows
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| 64 | the video to be modified or examined between the decoder and the encoder.
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| 65 | </p>
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| 66 | <p>Any number of hook modules can be placed inline, and they are run in the
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| 67 | order that they were specified on the ffmpeg command line.
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| 68 | </p>
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| 69 | <p>Three modules are provided and are described below. They are all intended to
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| 70 | be used as a base for your own modules.
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| 71 | </p>
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| 72 | <p>Modules are loaded using the -vhook option to ffmpeg. The value of this parameter
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| 73 | is a space separated list of arguments. The first is the module name, and the rest
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| 74 | are passed as arguments to the Configure function of the module.
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| 75 | </p>
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| 76 | <hr size="6">
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| 77 | <a name="SEC2"></a>
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| 78 | <table cellpadding="1" cellspacing="1" border="0">
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| 79 | <tr><td valign="middle" align="left">[<a href="#SEC1" title="Previous section in reading order"> < </a>]</td>
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| 80 | <td valign="middle" align="left">[<a href="#SEC3" title="Next section in reading order"> > </a>]</td>
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| 81 | <td valign="middle" align="left"> </td>
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| 82 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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| 83 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
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| 84 | <td valign="middle" align="left">[ >> ]</td>
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| 85 | <td valign="middle" align="left"> </td>
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| 86 | <td valign="middle" align="left"> </td>
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| 87 | <td valign="middle" align="left"> </td>
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| 88 | <td valign="middle" align="left"> </td>
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| 89 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
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| 90 | <td valign="middle" align="left">[Contents]</td>
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| 91 | <td valign="middle" align="left">[Index]</td>
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| 92 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
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| 93 | </tr></table>
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| 94 | <h2 class="section"> 1.1 null.c </h2>
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| 95 |
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| 96 | <p>This does nothing. Actually it converts the input image to RGB24 and then converts
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| 97 | it back again. This is meant as a sample that you can use to test your setup.
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| 98 | </p>
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| 99 | <hr size="6">
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| 100 | <a name="SEC3"></a>
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| 101 | <table cellpadding="1" cellspacing="1" border="0">
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| 102 | <tr><td valign="middle" align="left">[<a href="#SEC2" title="Previous section in reading order"> < </a>]</td>
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| 104 | <td valign="middle" align="left"> </td>
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| 105 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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| 109 | <td valign="middle" align="left"> </td>
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| 110 | <td valign="middle" align="left"> </td>
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| 111 | <td valign="middle" align="left"> </td>
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| 112 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
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| 113 | <td valign="middle" align="left">[Contents]</td>
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| 114 | <td valign="middle" align="left">[Index]</td>
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| 115 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
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| 116 | </tr></table>
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| 117 | <h2 class="section"> 1.2 fish.c </h2>
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| 118 |
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| 119 | <p>This implements a 'fish detector'. Essentially it converts the image into HSV
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| 120 | space and tests whether more than a certain percentage of the pixels fall into
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| 121 | a specific HSV cuboid. If so, then the image is saved into a file for processing
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| 122 | by other bits of code.
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| 123 | </p>
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| 124 | <p>Why use HSV? It turns out that HSV cuboids represent a more compact range of
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| 125 | colors than would an RGB cuboid.
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| 126 | </p>
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| 127 | <hr size="6">
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| 128 | <a name="SEC4"></a>
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| 129 | <table cellpadding="1" cellspacing="1" border="0">
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| 130 | <tr><td valign="middle" align="left">[<a href="#SEC3" title="Previous section in reading order"> < </a>]</td>
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| 131 | <td valign="middle" align="left">[ > ]</td>
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| 132 | <td valign="middle" align="left"> </td>
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| 133 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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| 134 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
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| 135 | <td valign="middle" align="left">[ >> ]</td>
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| 136 | <td valign="middle" align="left"> </td>
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| 137 | <td valign="middle" align="left"> </td>
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| 138 | <td valign="middle" align="left"> </td>
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| 139 | <td valign="middle" align="left"> </td>
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| 140 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
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| 141 | <td valign="middle" align="left">[Contents]</td>
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| 142 | <td valign="middle" align="left">[Index]</td>
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| 143 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
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| 144 | </tr></table>
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| 145 | <h2 class="section"> 1.3 imlib2.c </h2>
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| 146 |
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| 147 | <p>This allows a caption to be placed onto each frame. It supports inserting the
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| 148 | time and date. By using the imlib functions, it would be easy to add your own
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| 149 | graphical logo, add a frame/border, etc.
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| 150 | </p>
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| 151 |
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| 152 | <hr size="6">
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| 153 | <a name="SEC_About"></a>
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| 154 | <table cellpadding="1" cellspacing="1" border="0">
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| 155 | <tr><td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
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| 156 | <td valign="middle" align="left">[Contents]</td>
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| 157 | <td valign="middle" align="left">[Index]</td>
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| 158 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
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| 159 | </tr></table>
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| 160 | <h1>About This Document</h1>
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| 161 | <p>
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| 162 | This document was generated on <i>June, 30 2006</i> using <a href="http://texi2html.cvshome.org/"><i>texi2html 1.76</i></a>.
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| 163 | </p>
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| 164 | <p>
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| 165 | The buttons in the navigation panels have the following meaning:
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| 166 | </p>
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| 167 | <table border="1">
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| 168 | <tr>
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| 169 | <th> Button </th>
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| 170 | <th> Name </th>
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| 171 | <th> Go to </th>
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| 172 | <th> From 1.2.3 go to</th>
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| 173 | </tr>
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| 174 | <tr>
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| 175 | <td align="center"> [ < ] </td>
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| 176 | <td align="center">Back</td>
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| 177 | <td>previous section in reading order</td>
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| 178 | <td>1.2.2</td>
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| 179 | </tr>
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| 180 | <tr>
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| 181 | <td align="center"> [ > ] </td>
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| 182 | <td align="center">Forward</td>
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| 183 | <td>next section in reading order</td>
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| 184 | <td>1.2.4</td>
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| 185 | </tr>
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| 186 | <tr>
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| 187 | <td align="center"> [ << ] </td>
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| 188 | <td align="center">FastBack</td>
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| 189 | <td>beginning of this chapter or previous chapter</td>
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| 190 | <td>1</td>
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| 191 | </tr>
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| 192 | <tr>
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| 193 | <td align="center"> [ Up ] </td>
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| 194 | <td align="center">Up</td>
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| 195 | <td>up section</td>
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| 196 | <td>1.2</td>
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| 197 | </tr>
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| 198 | <tr>
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| 199 | <td align="center"> [ >> ] </td>
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| 200 | <td align="center">FastForward</td>
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| 201 | <td>next chapter</td>
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| 202 | <td>2</td>
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| 203 | </tr>
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| 204 | <tr>
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| 205 | <td align="center"> [Top] </td>
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| 206 | <td align="center">Top</td>
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| 207 | <td>cover (top) of document</td>
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| 208 | <td> </td>
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| 209 | </tr>
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| 210 | <tr>
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| 211 | <td align="center"> [Contents] </td>
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| 212 | <td align="center">Contents</td>
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| 213 | <td>table of contents</td>
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| 214 | <td> </td>
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| 215 | </tr>
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| 216 | <tr>
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| 217 | <td align="center"> [Index] </td>
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| 218 | <td align="center">Index</td>
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| 219 | <td>index</td>
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| 220 | <td> </td>
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| 221 | </tr>
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| 222 | <tr>
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| 223 | <td align="center"> [ ? ] </td>
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| 224 | <td align="center">About</td>
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| 225 | <td>about (help)</td>
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| 226 | <td> </td>
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| 227 | </tr>
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| 228 | </table>
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| 229 |
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| 230 | <p>
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| 231 | where the <strong> Example </strong> assumes that the current position is at <strong> Subsubsection One-Two-Three </strong> of a document of the following structure:
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| 232 | </p>
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| 233 |
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| 234 | <ul>
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| 235 | <li> 1. Section One
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| 236 | <ul>
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| 237 | <li>1.1 Subsection One-One
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| 238 | <ul>
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| 239 | <li>...</li>
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| 240 | </ul>
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| 241 | </li>
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| 242 | <li>1.2 Subsection One-Two
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| 243 | <ul>
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| 244 | <li>1.2.1 Subsubsection One-Two-One</li>
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| 245 | <li>1.2.2 Subsubsection One-Two-Two</li>
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| 246 | <li>1.2.3 Subsubsection One-Two-Three
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| 247 | <strong><== Current Position </strong></li>
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| 248 | <li>1.2.4 Subsubsection One-Two-Four</li>
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| 249 | </ul>
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| 250 | </li>
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| 251 | <li>1.3 Subsection One-Three
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| 252 | <ul>
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| 253 | <li>...</li>
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| 254 | </ul>
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| 255 | </li>
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| 256 | <li>1.4 Subsection One-Four</li>
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| 257 | </ul>
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| 258 | </li>
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| 259 | </ul>
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| 260 |
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| 261 | <hr size="1">
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| 262 | <p>
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| 263 | <font size="-1">
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| 264 | This document was generated on <i>June, 30 2006</i> using <a href="http://texi2html.cvshome.org/"><i>texi2html 1.76</i></a>.
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| 265 | </font>
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| 266 | <br>
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| 267 |
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| 268 | </p>
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| 269 | </body>
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| 270 | </html>
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