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annotate xml/ru/docs/http/ngx_http_mp4_module.xml @ 659:77a3314c74a7

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Avoid the uses of second person.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 28 Aug 2012 09:23:40 +0000
parents 764fbac1b8b4
children 95c3c3bbf1ce
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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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. Если файл отформатирован хорошо,
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53 с метаданными в начале файла, nginx просто посылает в ответ
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54 содержимое файла. В противном случае, он вынужден будет прочитать
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55 файл и подготовить новый поток, в котором метаданные предшествуют
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56 медийным данным. Это требует дополнительного процессорного
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57 времени, памяти и дискового ввода/вывода, поэтому лучше
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58 <link
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59 url="http://flowplayer.org/plugins/streaming/pseudostreaming.html#prepare">
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60 подготовить исходный файл для псевдо-стриминга</link>,
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61 нежели чем заставлять nginx делать это для каждого запроса.
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62 </para>
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63
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64 <para>
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65 Для запроса с ненулевым аргументом
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66 <literal>start</literal>
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67 nginx считывает из файла метаданные, готовит поток с запрошенного
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68 смещения, и отправляет его клиенту.
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69 Это тоже требует дополнительных ресурсов, как указано выше.
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70 </para>
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71
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72 <para>
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73 Если запрос, обрабатываемый этим модулем, не содержит аргумента
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74 <literal>start</literal>,
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75 дополнительные ресурсы не тратятся, а файл отсылается просто как
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76 статический ресурс.
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77 Некоторые плееры также поддерживают запросы с указанием диапазона
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78 запрашиваемых байт (byte-range requests), для них вообще не
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79 требуется этот модуль.
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80 </para>
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81
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82 <para>
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83 По умолчанию этот модуль не собирается, его сборку необходимо
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84 разрешить с помощью конфигурационного параметра
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85 <literal>--with-http_mp4_module</literal>.
87
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86 <note>
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87 Если ранее использовался сторонний модуль mp4, следует его отключить.
87
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88 </note>
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89 </para>
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90
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91 <para>
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92 Схожая поддержка псевдо-стриминга для FLV-файлов обеспечивается модулем
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93 <link doc="ngx_http_flv_module.xml">ngx_http_flv_module</link>.
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94 </para>
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95
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96 </section>
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97
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98
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99 <section id="example" name="Пример конфигурации">
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100
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101 <para>
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102 <example>
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103 location /video/ {
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104 mp4;
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105 mp4_buffer_size 1m;
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106 mp4_max_buffer_size 5m;
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107 }
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108 </example>
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109 </para>
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110
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111 </section>
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112
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113
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114 <section id="directives" name="Директивы">
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115
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116 <directive name="mp4">
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117 <syntax/>
87
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118 <default/>
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119 <context>location</context>
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120
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121 <para>
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122 Включает в содержащем location обработку этим модулем.
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123 </para>
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124
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125 </directive>
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126
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127
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128 <directive name="mp4_buffer_size">
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129 <syntax><value>размер</value></syntax>
102
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130 <default>512K</default>
87
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131 <context>http</context>
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132 <context>server</context>
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133 <context>location</context>
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134
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135 <para>
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136 Задаёт начальный размер буфера памяти, используемого при обработке MP4 файлов.
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137 </para>
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138
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139 </directive>
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140
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141
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142 <directive name="mp4_max_buffer_size">
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143 <syntax><value>размер</value></syntax>
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144 <default>10M</default>
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145 <context>http</context>
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146 <context>server</context>
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147 <context>location</context>
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148
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149 <para>
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150 В процессе обработки метаданных может понадобиться буфер большего размера.
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151 Его размер не может превышать указанного,
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152 иначе nginx возвращает серверную ошибку
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153 <http-status code="500" text="Internal Server Error"/>
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154 и протоколирует следующее:
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155 <example>
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156 "/some/movie/file.mp4" mp4 moov atom is too large:
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157 12583268, you may want to increase mp4_max_buffer_size
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158 </example>
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159 </para>
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160
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161 </directive>
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162
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163 </section>
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164
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165 </module>