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annotate xml/ru/docs/http/ngx_http_mp4_module.xml @ 580:be54c443235a

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Added copyright markers to documentation sources.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 10 Jul 2012 12:59:42 +0000
parents b082f02cb7a3
children 764fbac1b8b4
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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
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13 <section id="summary">
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14
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15 <para>
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16 Модуль <literal>ngx_http_mp4_module</literal> обеспечивает серверную поддержку
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17 псевдо-стриминга для файлов в формате H.264/AAC.
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18 Такие файлы обычно имеют расширения
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682163f2b298 Unified article/path and module/pathname into a single "path".
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19 <path>.mp4</path>, <path>.m4v</path> и <path>.m4a</path>.
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20 </para>
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21
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22 <para>
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23 Псевдо-стриминг работает в паре с совместимым Flash-плеером.
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24 Плеер посылает серверу HTTP-запрос с указанием точки времени старта
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25 в аргументе
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26 <literal>start</literal>
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27 строки запроса (время задаётся в секундах), а сервер в
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28 ответ посылает поток, у которого начальная позиция соответствует
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29 запрошенному времени, например:
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30 <example>
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31 http://example.com/elephants_dream.mp4?start=238.88
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32 </example>
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33 Это позволяет в любой момент времени выполнить произвольное
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34 позиционирование, а также начать воспроизведение с середины
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35 временной шкалы.
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36 </para>
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37
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38 <para>
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39 В форматах, основанных на H.264, метаданные, необходимые для поддержки
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40 позиционирования, хранятся в так называемом “moov атоме.”
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41 Это часть файла, которая содержит индексную информацию для всего файла.
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42 </para>
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43
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44 <para>
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45 До начала воспроизведения плееру необходимо прочитать метаданные.
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46 Для этого он отсылает специальный запрос с аргументом
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47 <literal>start=0</literal>.
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48 Многие кодирующие программы добавляют метаданные в конец файла.
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49 Для псевдо-стриминга это плохо: метаданные должны быть расположены
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50 в начале файла, иначе потребуется загрузить файл целиком, прежде
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51 чем начать воспроизведение. Если файл отформатирован хорошо,
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52 с метаданными в начале файла, nginx просто посылает в ответ
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53 содержимое файла. В противном случае, он вынужден будет прочитать
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54 файл и подготовить новый поток, в котором метаданные предшествуют
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55 медийным данным. Это требует дополнительного процессорного
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56 времени, памяти и дискового ввода/вывода, поэтому лучше
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57 <link
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58 url="http://flowplayer.org/plugins/streaming/pseudostreaming.html#prepare">
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59 подготовить исходный файл для псевдо-стриминга</link>,
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60 нежели чем заставлять nginx делать это для каждого запроса.
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61 </para>
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62
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63 <para>
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64 Для запроса с ненулевым аргументом
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65 <literal>start</literal>
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66 nginx считывает из файла метаданные, готовит поток с запрошенного
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67 смещения, и отправляет его клиенту.
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68 Это тоже требует дополнительных ресурсов, как указано выше.
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69 </para>
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70
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71 <para>
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72 Если запрос, обрабатываемый этим модулем, не содержит аргумента
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73 <literal>start</literal>,
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74 дополнительные ресурсы не тратятся, а файл отсылается просто как
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75 статический ресурс.
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76 Некоторые плееры также поддерживают запросы с указанием диапазона
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77 запрашиваемых байт (byte-range requests), для них вообще не
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78 требуется этот модуль.
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79 </para>
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80
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81 <para>
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82 По умолчанию этот модуль не собирается, его сборку необходимо
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83 разрешить с помощью конфигурационного параметра
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84 <literal>--with-http_mp4_module</literal>.
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85 <note>
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86 Если вы ранее использовали сторонний модуль mp4, не забудьте его отключить.
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87 </note>
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88 </para>
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89
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90 <para>
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91 Схожая поддержка псевдо-стриминга для FLV-файлов обеспечивается модулем
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92 <link doc="ngx_http_flv_module.xml">ngx_http_flv_module</link>.
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93 </para>
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94
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95 </section>
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96
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97
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98 <section id="example" name="Пример конфигурации">
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99
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100 <para>
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101 <example>
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102 location /video/ {
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103 mp4;
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104 mp4_buffer_size 1m;
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105 mp4_max_buffer_size 5m;
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106 }
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107 </example>
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108 </para>
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109
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110 </section>
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111
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112
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113 <section id="directives" name="Директивы">
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114
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115 <directive name="mp4">
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116 <syntax/>
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117 <default/>
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118 <context>location</context>
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119
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120 <para>
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121 Включает в содержащем location обработку этим модулем.
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122 </para>
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123
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124 </directive>
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125
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126
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127 <directive name="mp4_buffer_size">
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128 <syntax><value>размер</value></syntax>
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129 <default>512K</default>
87
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130 <context>http</context>
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131 <context>server</context>
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132 <context>location</context>
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133
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134 <para>
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135 Задаёт начальный размер буфера памяти, используемого при обработке MP4 файлов.
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136 </para>
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137
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138 </directive>
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139
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140
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141 <directive name="mp4_max_buffer_size">
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142 <syntax><value>размер</value></syntax>
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143 <default>10M</default>
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144 <context>http</context>
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145 <context>server</context>
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146 <context>location</context>
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147
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148 <para>
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149 В процессе обработки метаданных может понадобиться буфер большего размера.
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150 Его размер не может превышать указанного,
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151 иначе nginx возвращает серверную ошибку
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152 <http-status code="500" text="Internal Server Error"/>
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153 и протоколирует следующее:
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154 <example>
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155 "/some/movie/file.mp4" mp4 moov atom is too large:
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156 12583268, you may want to increase mp4_max_buffer_size
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157 </example>
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158 </para>
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159
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160 </directive>
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161
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162 </section>
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163
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164 </module>