Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_mp4_module.xml @ 368:ce12542164cf
Fixed some bugs.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Fri, 27 Jan 2012 22:26:28 +0000 |
parents | b082f02cb7a3 |
children | be54c443235a |
rev | line source |
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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 |
110
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9 <section id="summary"> |
87
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10 |
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11 <para> |
271 | 12 Модуль <literal>ngx_http_mp4_module</literal> обеспечивает серверную поддержку |
365 | 13 псевдо-стриминга для файлов в формате H.264/AAC. |
14 Такие файлы обычно имеют расширения | |
148
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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>. |
87
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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 |
271 | 22 <literal>start</literal> |
87
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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 |
271 | 43 <literal>start=0</literal>. |
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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 |
365 | 47 чем начать воспроизведение. Если файл отформатирован хорошо, |
87
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48 с метаданными в начале файла, nginx просто посылает в ответ |
365 | 49 содержимое файла. В противном случае, он вынужден будет прочитать |
87
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50 файл и подготовить новый поток, в котором метаданные предшествуют |
365 | 51 медийным данным. Это требует дополнительного процессорного |
87
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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 |
271 | 61 <literal>start</literal> |
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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 |
271 | 69 <literal>start</literal>, |
87
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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 |
271 | 80 <literal>--with-http_mp4_module</literal>. |
87
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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"> |
102
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112 <syntax/> |
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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"> |
271 | 124 <syntax><value>размер</value></syntax> |
102
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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"> |
271 | 138 <syntax><value>размер</value></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> |