Mercurial > hg > nginx-quic

annotate docs/xml/http/ngx_http_mp4_module.xml @ 4141:a18b10aea510

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Fixed markup.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 20 Sep 2011 13:15:41 +0000
parents d889195c8db4
children
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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="HTTP MP4 Module" id="http_mp4_module">
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6
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7 <section name="Summary">
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8
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9 <para>
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10 The module <code>ngx_http_mp4_module</code> provides pseudo-streaming
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11 server-side support for H.264/AAC files typically having filename extensions
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12 <pathname>.mp4</pathname>, <pathname>.m4v</pathname>,
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13 and <pathname>.m4a</pathname>.
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14 </para>
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15
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16 <para>
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17 Pseudo-streaming works in alliance with conformant Flash players.
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18 A player sends an HTTP request to the server with a start time
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19 argument in the request URI’s query string (named simply
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20 <parameter>start</parameter>
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21 and specified in seconds), and the server responds with a stream
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22 so that its start position corresponds to the requested time,
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23 for example:
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24 <example>
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25 http://example.com/elephants_dream.mp4?start=238.88
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26 </example>
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27 This allows for a random seeking at any time, or starting playback
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28 in the middle of a timeline.
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29 </para>
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30
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31 <para>
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32 To support seeking, H.264-based formats store the metadata
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33 in the so-called “moov atom.”
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34 It is a part of the file that holds the index information for the
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35 whole file.
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36 </para>
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37
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38 <para>
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39 To start playback, a player first needs to read metadata.
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40 This is done by sending a special request with the
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41 <parameter>start=0</parameter>
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42 argument. Many encoding software will insert the metadata at
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43 the end of the file. This is bad for pseudo-streaming:
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44 the metadata needs to be located at the beginning of the file,
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45 or else the entire file will have to be downloaded before it
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46 starts playing. If a file is well-formed (with metadata at the
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47 beginning of a file), nginx just sends back the contents of a file.
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48 Otherwise, it has to read the file and prepare a new stream so that
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49 metadata comes before media data.
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50 This involves some CPU, memory, and disk I/O overhead,
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51 so it is a good idea to
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52 <link url="http://flowplayer.org/plugins/streaming/pseudostreaming.html#prepare">
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53 prepare an original file for pseudo-streaming</link>,
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54 rather than having nginx do this on every such request.
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55 </para>
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56
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57 <para>
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58 For a matching request with a non-zero
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59 <parameter>start</parameter>
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60 argument, nginx will read metadata from the file, prepare the
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61 stream starting from the requested offset, and send it to a client.
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62 This has the same overhead as described above.
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63 </para>
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64
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65 <para>
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66 If a matching request does not include the
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67 <parameter>start</parameter>
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68 argument, there is no overhead, and the file is just sent as a static resource.
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69 Some players also support byte-range requests, and thus do not require
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70 this module at all.
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71 </para>
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72
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73 <para>
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74 This module is not built by default, it should be enabled with the
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75 <code>--with-http_mp4_module</code>
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76 configuration parameter.
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77 <note>
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78 If you were using the third-party mp4 module, be sure to disable it.
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79 </note>
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80 </para>
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81
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82 <para>
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83 A similar pseudo-streaming support for FLV files is provided by the module
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84 <link doc="ngx_http_flv_module.xml">ngx_http_flv_module</link>.
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85 </para>
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86
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87 </section>
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88
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89
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90 <section id="example" name="Example Configuration">
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91
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92 <para>
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93 <example>
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94 location /video/ {
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95 mp4;
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96 mp4_buffer_size 1m;
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97 mp4_max_buffer_size 5m;
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98 }
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99 </example>
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100 </para>
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101
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102 </section>
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103
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104
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105 <section id="directives" name="Directives">
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106
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107 <directive name="mp4">
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108 <syntax>mp4</syntax>
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109 <default/>
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110 <context>location</context>
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111
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112 <para>
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113 Turns on module processing in a surrounding location.
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114 </para>
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115
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116 </directive>
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117
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118
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119 <directive name="mp4_buffer_size">
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120 <syntax>mp4_buffer_size <argument>size</argument></syntax>
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121 <default>mp4_buffer_size 512K</default>
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122 <context>http</context>
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123 <context>server</context>
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124 <context>location</context>
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125
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126 <para>
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127 Sets the initial size of a memory buffer used to process MP4 files.
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128 </para>
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129
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130 </directive>
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131
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132
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133 <directive name="mp4_max_buffer_size">
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134 <syntax>mp4_max_buffer_size <argument>size</argument></syntax>
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135 <default>mp4_max_buffer_size 10M</default>
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136 <context>http</context>
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137 <context>server</context>
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138 <context>location</context>
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139
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140 <para>
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141 During metadata processing, a larger buffer may become necessary.
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142 Its size cannot exceed the specified <argument>size</argument>,
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143 or else nginx will return the server error
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144 <http-status code="500" text="Internal Server Error"/>,
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145 and log the following:
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146 <example>
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147 "/some/movie/file.mp4" mp4 moov atom is too large:
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148 12583268, you may want to increase mp4_max_buffer_size
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149 </example>
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150 </para>
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151
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152 </directive>
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153
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154 </section>
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155
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156 </module>