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annotate xml/ru/docs/http/ngx_http_mp4_module.xml @ 1096:f34be6b26447

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Corrected text formatting for ngx_http_mp4_module.
author Yaroslav Zhuravlev <yar@nginx.com>
date Tue, 04 Mar 2014 13:02:21 +0000
parents 95c3c3bbf1ce
children 1fcf8c840dbe
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="Модуль ngx_http_mp4_module"
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10 link="/ru/docs/http/ngx_http_mp4_module.html"
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11 lang="ru"
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12 rev="1">
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13
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14 <section id="summary">
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15
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16 <para>
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17 Модуль <literal>ngx_http_mp4_module</literal> обеспечивает серверную поддержку
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18 псевдо-стриминга для файлов в формате H.264/AAC.
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19 Такие файлы обычно имеют расширения
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682163f2b298 Unified article/path and module/pathname into a single "path".
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20 <path>.mp4</path>, <path>.m4v</path> и <path>.m4a</path>.
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21 </para>
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22
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23 <para>
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24 Псевдо-стриминг работает в паре с совместимым Flash-плеером.
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25 Плеер посылает серверу HTTP-запрос с указанием точки времени старта
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26 в аргументе
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27 <literal>start</literal>
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28 строки запроса (время задаётся в секундах), а сервер в
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29 ответ посылает поток, у которого начальная позиция соответствует
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30 запрошенному времени, например:
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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 Это позволяет в любой момент времени выполнить произвольное
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35 позиционирование, а также начать воспроизведение с середины
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36 временной шкалы.
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37 </para>
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38
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39 <para>
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40 В форматах, основанных на H.264, метаданные, необходимые для поддержки
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41 позиционирования, хранятся в так называемом “moov атоме.”
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42 Это часть файла, которая содержит индексную информацию для всего файла.
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43 </para>
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44
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45 <para>
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46 До начала воспроизведения плееру необходимо прочитать метаданные.
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47 Для этого он отсылает специальный запрос с аргументом
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48 <literal>start=0</literal>.
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49 Многие кодирующие программы добавляют метаданные в конец файла.
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50 Для псевдо-стриминга это плохо: метаданные должны быть расположены
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51 в начале файла, иначе потребуется загрузить файл целиком, прежде
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52 чем начать воспроизведение.
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53 Если файл отформатирован хорошо, с метаданными в начале файла,
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54 nginx просто посылает в ответ
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55 содержимое файла.
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56 В противном случае, он вынужден будет прочитать
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57 файл и подготовить новый поток, в котором метаданные предшествуют
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58 медийным данным.
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59 Это требует дополнительного процессорного
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60 времени, памяти и дискового ввода/вывода, поэтому лучше
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61 <link
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62 url="http://flowplayer.org/plugins/streaming/pseudostreaming.html#prepare">
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63 подготовить исходный файл для псевдо-стриминга</link>,
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64 нежели чем заставлять nginx делать это для каждого запроса.
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65 </para>
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66
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67 <para>
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68 Для запроса с ненулевым аргументом
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69 <literal>start</literal>
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70 nginx считывает из файла метаданные, готовит поток с запрошенного
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71 смещения, и отправляет его клиенту.
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72 Это тоже требует дополнительных ресурсов, как указано выше.
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73 </para>
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74
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75 <para>
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76 Если запрос, обрабатываемый этим модулем, не содержит аргумента
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77 <literal>start</literal>,
87
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78 дополнительные ресурсы не тратятся, а файл отсылается просто как
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79 статический ресурс.
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80 Некоторые плееры также поддерживают запросы с указанием диапазона
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81 запрашиваемых байт (byte-range requests), для них вообще не
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82 требуется этот модуль.
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83 </para>
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84
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85 <para>
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86 По умолчанию этот модуль не собирается, его сборку необходимо
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87 разрешить с помощью конфигурационного параметра
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88 <literal>--with-http_mp4_module</literal>.
87
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89 <note>
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90 Если ранее использовался сторонний модуль mp4, следует его отключить.
87
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91 </note>
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92 </para>
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93
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94 <para>
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95 Схожая поддержка псевдо-стриминга для FLV-файлов обеспечивается модулем
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96 <link doc="ngx_http_flv_module.xml">ngx_http_flv_module</link>.
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97 </para>
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98
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99 </section>
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100
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101
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102 <section id="example" name="Пример конфигурации">
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103
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104 <para>
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105 <example>
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106 location /video/ {
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107 mp4;
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108 mp4_buffer_size 1m;
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109 mp4_max_buffer_size 5m;
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110 }
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111 </example>
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112 </para>
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113
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114 </section>
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115
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116
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117 <section id="directives" name="Директивы">
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118
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119 <directive name="mp4">
102
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120 <syntax/>
87
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121 <default/>
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122 <context>location</context>
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123
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124 <para>
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125 Включает в содержащем location обработку этим модулем.
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126 </para>
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127
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128 </directive>
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129
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130
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131 <directive name="mp4_buffer_size">
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132 <syntax><value>размер</value></syntax>
102
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133 <default>512K</default>
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134 <context>http</context>
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135 <context>server</context>
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136 <context>location</context>
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137
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138 <para>
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139 Задаёт начальный размер буфера памяти, используемого при обработке MP4-файлов.
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140 </para>
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141
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142 </directive>
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143
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144
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145 <directive name="mp4_max_buffer_size">
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146 <syntax><value>размер</value></syntax>
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147 <default>10M</default>
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148 <context>http</context>
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149 <context>server</context>
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150 <context>location</context>
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151
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152 <para>
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153 В ходе обработки метаданных может понадобиться буфер большего размера.
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154 Его размер не может превышать указанного,
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155 иначе nginx вернёт серверную ошибку
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156 <http-status code="500" text="Internal Server Error"/>
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157 и запишет в лог следующее сообщение:
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158 <example>
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159 "/some/movie/file.mp4" mp4 moov atom is too large:
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160 12583268, you may want to increase mp4_max_buffer_size
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161 </example>
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162 </para>
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163
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164 </directive>
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165
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166 </section>
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167
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168 </module>