Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_mp4_module.xml @ 1106:5a7f86254a34
Mp4: documented the "end" request argument support.
| author | Yaroslav Zhuravlev <yar@nginx.com> |
|---|---|
| date | Tue, 04 Mar 2014 13:02:21 +0000 |
| parents | eb3713019359 |
| children | 65bc9d1ec234 |
| rev | line source |
|---|---|
| 22 | 1 <?xml version="1.0"?> |
| 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 |
| 22 | 7 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
| 8 | |
| 89 | 9 <module name="Module ngx_http_mp4_module" |
| 22 | 10 link="/en/docs/http/ngx_http_mp4_module.html" |
| 589 | 11 lang="en" |
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12 rev="6"> |
| 22 | 13 |
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14 <section id="summary"> |
| 22 | 15 |
| 16 <para> | |
| 966 | 17 The <literal>ngx_http_mp4_module</literal> module provides pseudo-streaming |
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18 server-side support for MP4 files. |
| 966 | 19 Such files typically have the <path>.mp4</path>, <path>.m4v</path>, |
| 20 or <path>.m4a</path> filename extensions. | |
| 22 | 21 </para> |
| 22 | |
| 23 <para> | |
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24 Pseudo-streaming works in alliance with a compatible Flash player. |
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25 The player sends an HTTP request to the server with the start time |
| 966 | 26 specified in the query string argument (named simply |
| 271 | 27 <literal>start</literal> |
| 966 | 28 and specified in seconds), and the server responds with the stream |
| 29 such that its start position corresponds to the requested time, | |
| 22 | 30 for example: |
| 31 <example> | |
| 32 http://example.com/elephants_dream.mp4?start=238.88 | |
| 33 </example> | |
| 966 | 34 This allows performing a random seeking at any time, or starting playback |
| 35 in the middle of the timeline. | |
| 22 | 36 </para> |
| 37 | |
| 38 <para> | |
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39 To support seeking, H.264-based formats store metadata |
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40 in a so-called “moov atom”. |
| 22 | 41 It is a part of the file that holds the index information for the |
| 42 whole file. | |
| 43 </para> | |
| 44 | |
| 45 <para> | |
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46 To start playback, the player first needs to read metadata. |
| 22 | 47 This is done by sending a special request with the |
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48 <literal>start=0</literal> argument. |
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49 A lot of encoding software insert the metadata at |
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50 the end of the file. |
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51 This is suboptimal for pseudo-streaming, because the player |
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52 has to download the entire file before starting playback. |
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53 If the metadata are located at the beginning of the file, |
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54 it is enough for nginx to simply start sending back the file contents. |
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55 If the metadata are located at the end of the file, |
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56 nginx must read the entire file and prepare a new stream so that |
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57 the metadata come before the media data. |
| 22 | 58 This involves some CPU, memory, and disk I/O overhead, |
| 59 so it is a good idea to | |
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60 <link |
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61 url="http://flowplayer.org/plugins/streaming/pseudostreaming.html#prepare"> |
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62 prepare an original file for pseudo-streaming</link> in advance, |
| 22 | 63 rather than having nginx do this on every such request. |
| 64 </para> | |
| 65 | |
| 66 <para> | |
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67 The module also supports the <literal>end</literal> argument of an HTTP request |
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68 (1.5.13) which sets the end point of playback. |
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69 The <literal>end</literal> argument can be specified with the |
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70 <literal>start</literal> argument |
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71 or separately: |
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72 <example> |
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73 http://example.com/elephants_dream.mp4?start=238.88&end=555.55 |
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74 </example> |
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75 </para> |
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76 |
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77 <para> |
| 22 | 78 For a matching request with a non-zero |
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79 <literal>start</literal> or <literal>end</literal> |
| 966 | 80 argument, nginx will read the metadata from the file, prepare the |
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81 stream with the requested time range, and send it to the client. |
| 22 | 82 This has the same overhead as described above. |
| 83 </para> | |
| 84 | |
| 85 <para> | |
| 86 If a matching request does not include the | |
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87 <literal>start</literal> and <literal>end</literal> |
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88 arguments, there is no overhead, and the file is sent simply as a static |
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89 resource. |
| 22 | 90 Some players also support byte-range requests, and thus do not require |
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91 this module. |
| 22 | 92 </para> |
| 93 | |
| 94 <para> | |
| 95 This module is not built by default, it should be enabled with the | |
| 271 | 96 <literal>--with-http_mp4_module</literal> |
| 22 | 97 configuration parameter. |
| 98 <note> | |
| 966 | 99 If a third-party mp4 module was previously used, it should be disabled. |
| 22 | 100 </note> |
| 101 </para> | |
| 102 | |
| 103 <para> | |
| 966 | 104 A similar pseudo-streaming support for FLV files is provided by the |
| 105 <link doc="ngx_http_flv_module.xml">ngx_http_flv_module</link> module. | |
| 22 | 106 </para> |
| 107 | |
| 108 </section> | |
| 109 | |
| 110 | |
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111 <section id="example" name="Example Configuration"> |
| 22 | 112 |
| 113 <para> | |
| 114 <example> | |
| 115 location /video/ { | |
| 116 mp4; | |
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117 mp4_buffer_size 1m; |
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118 mp4_max_buffer_size 5m; |
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119 mp4_limit_rate on; |
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120 mp4_limit_rate_after 30s; |
| 22 | 121 } |
| 122 </example> | |
| 123 </para> | |
| 124 | |
| 125 </section> | |
| 126 | |
| 127 | |
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128 <section id="directives" name="Directives"> |
| 22 | 129 |
| 130 <directive name="mp4"> | |
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131 <syntax/> |
| 22 | 132 <default/> |
| 133 <context>location</context> | |
| 134 | |
| 135 <para> | |
| 136 Turns on module processing in a surrounding location. | |
| 137 </para> | |
| 138 | |
| 139 </directive> | |
| 140 | |
| 141 | |
| 142 <directive name="mp4_buffer_size"> | |
| 271 | 143 <syntax><value>size</value></syntax> |
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144 <default>512K</default> |
| 22 | 145 <context>http</context> |
| 146 <context>server</context> | |
| 147 <context>location</context> | |
| 148 | |
| 149 <para> | |
| 966 | 150 Sets the initial size of a memory buffer used for processing MP4 files. |
| 22 | 151 </para> |
| 152 | |
| 153 </directive> | |
| 154 | |
| 155 | |
| 156 <directive name="mp4_max_buffer_size"> | |
| 271 | 157 <syntax><value>size</value></syntax> |
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158 <default>10M</default> |
| 22 | 159 <context>http</context> |
| 160 <context>server</context> | |
| 161 <context>location</context> | |
| 162 | |
| 163 <para> | |
| 164 During metadata processing, a larger buffer may become necessary. | |
| 271 | 165 Its size cannot exceed the specified <value>size</value>, |
| 966 | 166 or else nginx will return the |
| 167 <http-status code="500" text="Internal Server Error"/> server error, | |
| 168 and log the following message: | |
| 22 | 169 <example> |
| 170 "/some/movie/file.mp4" mp4 moov atom is too large: | |
| 171 12583268, you may want to increase mp4_max_buffer_size | |
| 172 </example> | |
| 173 </para> | |
| 174 | |
| 175 </directive> | |
| 176 | |
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177 |
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178 <directive name="mp4_limit_rate"> |
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179 <syntax> |
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180 <literal>on</literal> | |
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181 <literal>off</literal> | |
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182 <value>factor</value></syntax> |
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183 <default>off</default> |
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184 <context>http</context> |
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185 <context>server</context> |
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186 <context>location</context> |
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187 |
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188 <para> |
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189 Limits the rate of response transmission to a client. |
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190 The rate is limited based on the average bitrate of the |
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191 MP4 file served. |
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192 To calculate the rate, the bitrate is multiplied by the specified |
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193 <value>factor</value>. |
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194 The special value “<literal>on</literal>” corresponds to the factor of 1.1. |
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195 The special value “<literal>off</literal>” disables rate limiting. |
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196 The limit is set per a request, and so if a client simultaneously opens |
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197 two connections, the overall rate will be twice as much |
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198 as the specified limit. |
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199 </para> |
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200 |
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201 <para> |
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202 <note> |
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203 This directive is available as part of our <commercial_version/>. |
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204 </note> |
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205 </para> |
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206 |
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207 </directive> |
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208 |
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209 |
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210 <directive name="mp4_limit_rate_after"> |
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211 <syntax><value>time</value></syntax> |
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212 <default>60s</default> |
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213 <context>http</context> |
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214 <context>server</context> |
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215 <context>location</context> |
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216 |
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217 <para> |
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218 Sets the initial amount of media data (measured in playback time) |
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219 after which the further transmission of the response to a client |
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220 will be rate limited. |
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221 </para> |
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222 |
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223 <para> |
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224 <note> |
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225 This directive is available as part of our <commercial_version/>. |
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226 </note> |
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227 </para> |
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228 |
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229 </directive> |
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230 |
| 22 | 231 </section> |
| 232 | |
| 233 </module> |