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-<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>HTTP MP4 Module</title></head><body><center><h3>HTTP MP4 Module</h3></center><center><h4>Summary</h4></center><p>
-The module <code>ngx_http_mp4_module</code> provides pseudo-streaming
-server-side support for H.264/AAC files typically having filename extensions
-<code>.mp4</code>, <code>.m4v</code>,
-and <code>.m4a</code>.
-</p><p>
-Pseudo-streaming works in alliance with conformant Flash players.
-A player sends an HTTP request to the server with a start time
-argument in the request URI’s query string (named simply
-<code>start</code>
-and specified in seconds), and the server responds with a stream
-so that its start position corresponds to the requested time,
-for example:
-<blockquote><pre>
-http://example.com/elephants_dream.mp4?start=238.88
-</pre></blockquote>
-This allows for a random seeking at any time, or starting playback
-in the middle of a timeline.
-</p><p>
-To support seeking, H.264-based formats store the metadata
-in the so-called “moov atom.”
-It is a part of the file that holds the index information for the
-whole file.
-</p><p>
-To start playback, a player first needs to read metadata.
-This is done by sending a special request with the
-<code>start=0</code>
-argument. Many encoding software will insert the metadata at
-the end of the file. This is bad for pseudo-streaming:
-the metadata needs to be located at the beginning of the file,
-or else the entire file will have to be downloaded before it
-starts playing. If a file is well-formed (with metadata at the
-beginning of a file), nginx just sends back the contents of a file.
-Otherwise, it has to read the file and prepare a new stream so that
-metadata comes before media data.
-This involves some CPU, memory, and disk I/O overhead,
-so it is a good idea to
-<a href="http://flowplayer.org/plugins/streaming/pseudostreaming.html#prepare">
-prepare an original file for pseudo-streaming</a>,
-rather than having nginx do this on every such request.
-</p><p>
-For a matching request with a non-zero
-<code>start</code>
-argument, nginx will read metadata from the file, prepare the
-stream starting from the requested offset, and send it to a client.
-This has the same overhead as described above.
-</p><p>
-If a matching request does not include the
-<code>start</code>
-argument, there is no overhead, and the file is just sent as a static resource.
-Some players also support byte-range requests, and thus do not require
-this module at all.
-</p><p>
-This module is not built by default, it should be enabled with the
-<code>--with-http_mp4_module</code>
-configuration parameter.
-
-If you were using the third-party mp4 module, be sure to disable it.
-</p><p>
-A similar pseudo-streaming support for FLV files is provided by the module
-<a href="ngx_http_flv_module.html">ngx_http_flv_module</a>.
-</p><a name="example"></a><center><h4>Example Configuration</h4></center><p><blockquote><pre>
-location /video/ {
- mp4;
- mp4_buffer_size 1m;
- mp4_max_buffer_size 5m;
-}
-</pre></blockquote></p><a name="directives"></a><center><h4>Directives</h4></center><hr><a name="mp4"></a><strong>syntax</strong>:
- <code>mp4</code><br><strong>default</strong>:
- <strong>none</strong><br><strong>context</strong>:
- <code>location</code><br><p>
-Turns on module processing in a surrounding location.
-</p><hr><a name="mp4_buffer_size"></a><strong>syntax</strong>:
- <code>mp4_buffer_size <code><i>size</i></code></code><br><strong>default</strong>:
- <code>mp4_buffer_size 512K</code><br><strong>context</strong>:
- <code>http</code>, <code>server</code>, <code>location</code><br><p>
-Sets the initial size of a memory buffer used to process MP4 files.
-</p><hr><a name="mp4_max_buffer_size"></a><strong>syntax</strong>:
- <code>mp4_max_buffer_size <code><i>size</i></code></code><br><strong>default</strong>:
- <code>mp4_max_buffer_size 10M</code><br><strong>context</strong>:
- <code>http</code>, <code>server</code>, <code>location</code><br><p>
-During metadata processing, a larger buffer may become necessary.
-Its size cannot exceed the specified <code><i>size</i></code>,
-or else nginx will return the server error
-500 (Internal Server Error),
-and log the following:
-<blockquote><pre>
-"/some/movie/file.mp4" mp4 moov atom is too large:
-12583268, you may want to increase mp4_max_buffer_size
-</pre></blockquote></p></body></html>