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annotate xml/ru/docs/http/ngx_http_mp4_module.xml @ 87:f5539fb36bbb

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Russian translation of ngx_http_mp4_module.
author Ruslan Ermilov <ru@nginx.com>
date Fri, 14 Oct 2011 08:45:37 +0000
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children c76a257f3fd4
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f5539fb36bbb Russian translation of ngx_http_mp4_module.
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1 <?xml version="1.0"?>
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2
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3 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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4
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5 <module name="Модуль ngx_http_mp4_module"
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6 link="/ru/docs/http/ngx_http_mp4_module.html"
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7 lang="ru">
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8
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9 <section name="Обзор">
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10
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11 <para>
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12 Модуль <code>ngx_http_mp4_module</code> обеспечивает серверную поддержку
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13 псевдо-стриминга для файлов в формате H.264/AAC. Такие файлы обычно
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14 имеют расширения
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15 <pathname>.mp4</pathname>, <pathname>.m4v</pathname>
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16 и <pathname>.m4a</pathname>.
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17 </para>
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18
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19 <para>
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20 Псевдо-стриминг работает в паре с совместимым Flash-плеером.
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21 Плеер посылает серверу HTTP-запрос с указанием точки времени старта
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22 в аргументе
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23 <parameter>start</parameter>
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24 строки запроса (время задаётся в секундах), а сервер в
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25 ответ посылает поток, у которого начальная позиция соответствует
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26 запрошенному времени, например:
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27 <example>
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28 http://example.com/elephants_dream.mp4?start=238.88
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29 </example>
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30 Это позволяет в любой момент времени выполнить произвольное
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31 позиционирование, а также начать воспроизведение с середины
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32 временной шкалы.
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33 </para>
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34
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35 <para>
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36 В форматах, основанных на H.264, метаданные, необходимые для поддержки
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37 позиционирования, хранятся в так называемом “moov атоме.”
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38 Это часть файла, которая содержит индексную информацию для всего файла.
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39 </para>
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40
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41 <para>
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42 До начала воспроизведения плееру необходимо прочитать метаданные.
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43 Для этого он отсылает специальный запрос с аргументом
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44 <parameter>start=0</parameter>.
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45 Многие кодирующие программы добавляют метаданные в конец файла.
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46 Для псевдо-стриминга это плохо: метаданные должны быть расположены
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47 в начале файла, иначе потребуется загрузить файл целиком, прежде
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48 чем начать воспроизведение. Если файл отформатирован хорошо,
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49 с метаданными в начале файла, nginx просто посылает в ответ
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50 содержимое файла. В противном случае, он вынужден будет прочитать
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51 файл и подготовить новый поток, в котором метаданные предшествуют
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52 медийным данным. Это требует дополнительного процессорного
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53 времени, памяти и дискового ввода/вывода, поэтому лучше
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54 <link
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55 url="http://flowplayer.org/plugins/streaming/pseudostreaming.html#prepare">
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56 подготовить исходный файл для псевдо-стриминга</link>,
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57 нежели чем заставлять nginx делать это для каждого запроса.
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58 </para>
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59
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60 <para>
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61 Для запроса с ненулевым аргументом
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62 <parameter>start</parameter>
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63 nginx считывает из файла метаданные, готовит поток с запрошенного
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64 смещения, и отправляет его клиенту.
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65 Это тоже требует дополнительных ресурсов, как указано выше.
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66 </para>
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67
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68 <para>
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69 Если запрос, обрабатываемый этим модулем, не содержит аргумента
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70 <parameter>start</parameter>,
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71 дополнительные ресурсы не тратятся, а файл отсылается просто как
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72 статический ресурс.
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73 Некоторые плееры также поддерживают запросы с указанием диапазона
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74 запрашиваемых байт (byte-range requests), для них вообще не
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75 требуется этот модуль.
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76 </para>
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77
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78 <para>
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79 По умолчанию этот модуль не собирается, его сборку необходимо
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80 разрешить с помощью конфигурационного параметра
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81 <code>--with-http_mp4_module</code>.
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82 <note>
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83 Если вы ранее использовали сторонний модуль mp4, не забудьте его отключить.
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84 </note>
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85 </para>
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86
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87 <para>
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88 Схожая поддержка псевдо-стриминга для FLV-файлов обеспечивается модулем
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89 <link doc="ngx_http_flv_module.xml">ngx_http_flv_module</link>.
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90 </para>
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91
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92 </section>
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93
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94
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95 <section id="example" name="Пример конфигурации">
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96
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97 <para>
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98 <example>
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99 location /video/ {
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100 mp4;
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101 mp4_buffer_size 1m;
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102 mp4_max_buffer_size 5m;
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103 }
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104 </example>
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105 </para>
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106
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107 </section>
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108
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109
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110 <section id="directives" name="Директивы">
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111
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112 <directive name="mp4">
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113 <syntax>mp4</syntax>
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114 <default/>
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115 <context>location</context>
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116
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117 <para>
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118 Включает в содержащем location обработку этим модулем.
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119 </para>
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120
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121 </directive>
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122
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123
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124 <directive name="mp4_buffer_size">
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125 <syntax>mp4_buffer_size <argument>размер</argument></syntax>
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126 <default>mp4_buffer_size 512K</default>
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127 <context>http</context>
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128 <context>server</context>
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129 <context>location</context>
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130
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131 <para>
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132 Задаёт начальный размер буфера памяти, используемого при обработке MP4 файлов.
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133 </para>
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134
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135 </directive>
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136
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137
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138 <directive name="mp4_max_buffer_size">
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139 <syntax>mp4_max_buffer_size <argument>размер</argument></syntax>
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140 <default>mp4_max_buffer_size 10M</default>
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141 <context>http</context>
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142 <context>server</context>
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143 <context>location</context>
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144
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145 <para>
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146 В процессе обработки метаданных может понадобиться буфер большего размера.
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147 Его размер не может превышать указанного,
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148 иначе nginx возвращает серверную ошибку
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149 <http-status code="500" text="Internal Server Error"/>
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150 и протоколирует следующее:
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151 <example>
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152 "/some/movie/file.mp4" mp4 moov atom is too large:
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153 12583268, you may want to increase mp4_max_buffer_size
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154 </example>
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155 </para>
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156
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157 </directive>
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158
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159 </section>
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160
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161 </module>