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Documented the "rate" parameter of the "error_log" directive.
author Maxim Dounin <mdounin@mdounin.ru>
date Sun, 16 Jun 2024 06:55:30 +0300
parents 9eadb98ec770
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) Nginx, Inc.
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5 -->
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6
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7 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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8
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9 <module name="Module ngx_http_mp4_module"
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10 link="/en/docs/http/ngx_http_mp4_module.html"
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11 lang="en"
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12 rev="9">
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13
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14 <section id="summary">
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16 <para>
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17 The <literal>ngx_http_mp4_module</literal> module provides pseudo-streaming
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18 server-side support for MP4 files.
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19 Such files typically have the <path>.mp4</path>, <path>.m4v</path>,
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20 or <path>.m4a</path> filename extensions.
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21 </para>
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23 <para>
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24 Pseudo-streaming works in alliance with a compatible media player.
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25 The player sends an HTTP request to the server with the start time
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26 specified in the query string argument (named simply
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27 <literal>start</literal>
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28 and specified in seconds), and the server responds with the stream
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29 such that its start position corresponds to the requested time,
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30 for example:
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31 <example>
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32 http://example.com/elephants_dream.mp4?start=238.88
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33 </example>
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34 This allows performing a random seeking at any time, or starting playback
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35 in the middle of the timeline.
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36 </para>
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38 <para>
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39 To support seeking, H.264-based formats store metadata
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40 in a so-called “moov atom”.
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41 It is a part of the file that holds the index information for the
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42 whole file.
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43 </para>
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45 <para>
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46 To start playback, the player first needs to read metadata.
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47 This is done by sending a special request with the
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48 <literal>start=0</literal> argument.
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49 A lot of encoding software insert the metadata at
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50 the end of the file.
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51 This is suboptimal for pseudo-streaming, because the player
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52 has to download the entire file before starting playback.
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53 If the metadata are located at the beginning of the file,
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54 it is enough for nginx to simply start sending back the file contents.
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55 If the metadata are located at the end of the file,
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56 nginx must read the entire file and prepare a new stream so that
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57 the metadata come before the media data.
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58 This involves some CPU, memory, and disk I/O overhead,
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59 so it is a good idea to
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60 <link
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61 url="https://github.com/flowplayer/flowplayer/wiki/7.1.1-video-file-correction">
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62 prepare an original file for pseudo-streaming</link> in advance,
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63 rather than having nginx do this on every such request.
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64 </para>
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66 <para>
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67 The module also supports the <literal>end</literal> argument of an HTTP request
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68 (1.5.13) which sets the end point of playback.
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69 The <literal>end</literal> argument can be specified with the
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70 <literal>start</literal> argument
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71 or separately:
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72 <example>
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73 http://example.com/elephants_dream.mp4?start=238.88&amp;end=555.55
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74 </example>
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75 </para>
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76
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77 <para>
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78 For a matching request with a non-zero
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79 <literal>start</literal> or <literal>end</literal>
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80 argument, nginx will read the metadata from the file, prepare the
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81 stream with the requested time range, and send it to the client.
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82 This has the same overhead as described above.
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83 </para>
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84
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85 <para id="keyframe">
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86 If the <literal>start</literal> argument points to
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87 a non-key video frame,
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88 the beginning of such video will be broken.
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89 To fix this issue, the video
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90 <link id="mp4_start_key_frame">can</link> be prepended with
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91 the key frame before <literal>start</literal> point
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92 and with all intermediate frames between them.
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93 These frames will be hidden from playback
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94 using an edit list (1.21.4).
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95 </para>
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96
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97 <para>
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98 If a matching request does not include the
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99 <literal>start</literal> and <literal>end</literal>
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100 arguments, there is no overhead, and the file is sent simply as a static
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101 resource.
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102 Some players also support byte-range requests, and thus do not require
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103 this module.
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104 </para>
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105
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106 <para>
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107 This module is not built by default, it should be enabled with the
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108 <literal>--with-http_mp4_module</literal>
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109 configuration parameter.
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110 <note>
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111 If a third-party mp4 module was previously used, it should be disabled.
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112 </note>
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113 </para>
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114
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115 <para>
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116 A similar pseudo-streaming support for FLV files is provided by the
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117 <link doc="ngx_http_flv_module.xml">ngx_http_flv_module</link> module.
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118 </para>
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119
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120 </section>
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121
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122
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123 <section id="example" name="Example Configuration">
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124
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125 <para>
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126 <example>
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127 location /video/ {
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128 mp4;
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129 mp4_buffer_size 1m;
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130 mp4_max_buffer_size 5m;
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131 mp4_limit_rate on;
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132 mp4_limit_rate_after 30s;
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133 }
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134 </example>
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135 </para>
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136
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137 </section>
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138
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139
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140 <section id="directives" name="Directives">
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141
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142 <directive name="mp4">
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143 <syntax/>
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144 <default/>
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145 <context>location</context>
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146
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147 <para>
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148 Turns on module processing in a surrounding location.
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149 </para>
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150
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151 </directive>
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152
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153
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154 <directive name="mp4_buffer_size">
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155 <syntax><value>size</value></syntax>
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156 <default>512K</default>
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157 <context>http</context>
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158 <context>server</context>
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159 <context>location</context>
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160
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161 <para>
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162 Sets the initial <value>size</value> of the buffer used for
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163 processing MP4 files.
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164 </para>
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165
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166 </directive>
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167
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168
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169 <directive name="mp4_max_buffer_size">
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170 <syntax><value>size</value></syntax>
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171 <default>10M</default>
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172 <context>http</context>
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173 <context>server</context>
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174 <context>location</context>
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175
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176 <para>
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177 During metadata processing, a larger buffer may become necessary.
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178 Its size cannot exceed the specified <value>size</value>,
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179 or else nginx will return the
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180 <http-status code="500" text="Internal Server Error"/> server error,
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181 and log the following message:
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182 <example>
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183 "/some/movie/file.mp4" mp4 moov atom is too large:
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184 12583268, you may want to increase mp4_max_buffer_size
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185 </example>
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186 </para>
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187
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188 </directive>
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189
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190
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191 <directive name="mp4_start_key_frame">
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192 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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193 <default>off</default>
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194 <context>http</context>
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195 <context>server</context>
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196 <context>location</context>
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197 <appeared-in>1.21.4</appeared-in>
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198
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199 <para>
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200 Forces output video to always start with a key video frame.
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201 If the <literal>start</literal> argument does not point to a key frame,
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202 initial frames are hidden using an mp4 edit list.
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203 Edit lists are supported by major players and browsers such as
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204 Chrome, Safari, QuickTime and ffmpeg,
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205 partially supported by Firefox.
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206 </para>
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207
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208 </directive>
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209
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210 </section>
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211
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212 </module>