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annotate xml/ru/docs/http/ngx_http_mp4_module.xml @ 148:682163f2b298

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Unified article/path and module/pathname into a single "path". "path" no longer emits double quotes so preserve them where needed. Replaced some misuses of "path" and "dirname".
author Ruslan Ermilov <ru@nginx.com>
date Tue, 25 Oct 2011 13:28:36 +0000
parents 40eec261c2a6
children 4c6d2c614d2c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 id="summary">
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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
148
682163f2b298 Unified article/path and module/pathname into a single "path".
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15 <path>.mp4</path>, <path>.m4v</path> и <path>.m4a</path>.
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16 </para>
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17
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18 <para>
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19 Псевдо-стриминг работает в паре с совместимым Flash-плеером.
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20 Плеер посылает серверу HTTP-запрос с указанием точки времени старта
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21 в аргументе
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22 <parameter>start</parameter>
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23 строки запроса (время задаётся в секундах), а сервер в
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24 ответ посылает поток, у которого начальная позиция соответствует
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25 запрошенному времени, например:
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26 <example>
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27 http://example.com/elephants_dream.mp4?start=238.88
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28 </example>
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29 Это позволяет в любой момент времени выполнить произвольное
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30 позиционирование, а также начать воспроизведение с середины
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31 временной шкалы.
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32 </para>
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33
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34 <para>
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35 В форматах, основанных на H.264, метаданные, необходимые для поддержки
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36 позиционирования, хранятся в так называемом “moov атоме.”
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37 Это часть файла, которая содержит индексную информацию для всего файла.
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38 </para>
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39
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40 <para>
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41 До начала воспроизведения плееру необходимо прочитать метаданные.
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42 Для этого он отсылает специальный запрос с аргументом
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43 <parameter>start=0</parameter>.
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44 Многие кодирующие программы добавляют метаданные в конец файла.
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45 Для псевдо-стриминга это плохо: метаданные должны быть расположены
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46 в начале файла, иначе потребуется загрузить файл целиком, прежде
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47 чем начать воспроизведение. Если файл отформатирован хорошо,
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48 с метаданными в начале файла, nginx просто посылает в ответ
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49 содержимое файла. В противном случае, он вынужден будет прочитать
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50 файл и подготовить новый поток, в котором метаданные предшествуют
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51 медийным данным. Это требует дополнительного процессорного
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52 времени, памяти и дискового ввода/вывода, поэтому лучше
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53 <link
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54 url="http://flowplayer.org/plugins/streaming/pseudostreaming.html#prepare">
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55 подготовить исходный файл для псевдо-стриминга</link>,
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56 нежели чем заставлять nginx делать это для каждого запроса.
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57 </para>
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58
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59 <para>
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60 Для запроса с ненулевым аргументом
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61 <parameter>start</parameter>
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62 nginx считывает из файла метаданные, готовит поток с запрошенного
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63 смещения, и отправляет его клиенту.
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64 Это тоже требует дополнительных ресурсов, как указано выше.
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65 </para>
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66
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67 <para>
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68 Если запрос, обрабатываемый этим модулем, не содержит аргумента
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69 <parameter>start</parameter>,
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70 дополнительные ресурсы не тратятся, а файл отсылается просто как
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71 статический ресурс.
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72 Некоторые плееры также поддерживают запросы с указанием диапазона
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73 запрашиваемых байт (byte-range requests), для них вообще не
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74 требуется этот модуль.
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75 </para>
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76
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77 <para>
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78 По умолчанию этот модуль не собирается, его сборку необходимо
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79 разрешить с помощью конфигурационного параметра
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80 <code>--with-http_mp4_module</code>.
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81 <note>
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82 Если вы ранее использовали сторонний модуль mp4, не забудьте его отключить.
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83 </note>
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84 </para>
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85
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86 <para>
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87 Схожая поддержка псевдо-стриминга для FLV-файлов обеспечивается модулем
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88 <link doc="ngx_http_flv_module.xml">ngx_http_flv_module</link>.
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89 </para>
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90
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91 </section>
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92
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93
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94 <section id="example" name="Пример конфигурации">
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95
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96 <para>
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97 <example>
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98 location /video/ {
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99 mp4;
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100 mp4_buffer_size 1m;
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101 mp4_max_buffer_size 5m;
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102 }
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103 </example>
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104 </para>
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105
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106 </section>
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107
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108
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109 <section id="directives" name="Директивы">
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110
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111 <directive name="mp4">
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112 <syntax/>
87
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113 <default/>
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114 <context>location</context>
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115
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116 <para>
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117 Включает в содержащем location обработку этим модулем.
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118 </para>
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119
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120 </directive>
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121
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122
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123 <directive name="mp4_buffer_size">
102
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124 <syntax><argument>размер</argument></syntax>
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125 <default>512K</default>
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126 <context>http</context>
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127 <context>server</context>
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128 <context>location</context>
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129
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130 <para>
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131 Задаёт начальный размер буфера памяти, используемого при обработке MP4 файлов.
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132 </para>
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133
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134 </directive>
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135
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136
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137 <directive name="mp4_max_buffer_size">
102
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138 <syntax><argument>размер</argument></syntax>
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139 <default>10M</default>
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140 <context>http</context>
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141 <context>server</context>
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142 <context>location</context>
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143
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144 <para>
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145 В процессе обработки метаданных может понадобиться буфер большего размера.
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146 Его размер не может превышать указанного,
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147 иначе nginx возвращает серверную ошибку
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148 <http-status code="500" text="Internal Server Error"/>
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149 и протоколирует следующее:
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150 <example>
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151 "/some/movie/file.mp4" mp4 moov atom is too large:
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152 12583268, you may want to increase mp4_max_buffer_size
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153 </example>
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154 </para>
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155
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156 </directive>
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157
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158 </section>
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159
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160 </module>