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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>3gppmux</title>
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<tr><td colspan="5" class="shortcuts">
<a href="#gst-plugins-good-plugins-3gppmux.synopsis" class="shortcut">Top</a>
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<a href="#gst-plugins-good-plugins-3gppmux.description" class="shortcut">Description</a>
</td></tr>
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<div class="refentry">
<a name="gst-plugins-good-plugins-3gppmux"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-good-plugins-3gppmux.top_of_page"></a>3gppmux</span></h2>
<p>3gppmux — Muxer for 3GPP (.3gp) files</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gst-plugins-good-plugins-3gppmux.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"></pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-3gppmux.description"></a><h2>Description</h2>
<p>
This element merges streams (audio and video) into 3GPP (.3gp) files.
</p>
<p>
The following background intends to explain why various similar muxers
are present in this plugin.
</p>
<p>
The <a class="ulink" href="http://www.apple.com/quicktime/resources/qtfileformat.pdf" target="_top">
QuickTime file format specification</a> served as basis for the MP4 file
format specification (mp4mux), and as such the QuickTime file structure is
nearly identical to the so-called ISO Base Media file format defined in
ISO 14496-12 (except for some media specific parts).
In turn, the latter ISO Base Media format was further specialized as a
Motion JPEG-2000 file format in ISO 15444-3 (mj2mux)
and in various 3GPP(2) specs (gppmux).
The fragmented file features defined (only) in ISO Base Media are used by
ISMV files making up (a.o.) Smooth Streaming (ismlmux).
</p>
<p>
A few properties (movie-timescale,
trak-timescale) allow adjusting
some technical parameters, which might be useful in (rare) cases to resolve
compatibility issues in some situations.
</p>
<p>
Some other properties influence the result more fundamentally.
A typical mov/mp4 file's metadata (aka moov) is located at the end of the file,
somewhat contrary to this usually being called "the header".
However, a faststart file will
(with some effort) arrange this to be located near start of the file,
which then allows it e.g. to be played while downloading.
Alternatively, rather than having one chunk of metadata at start (or end),
there can be some metadata at start and most of the other data can be spread
out into fragments of fragment-duration.
If such fragmented layout is intended for streaming purposes, then
streamable allows foregoing to add
index metadata (at the end of file).
</p>
<p>
dts-method allows selecting a
method for managing input timestamps (stay tuned for 0.11 to have this
automagically settled). The default delta/duration method should handle nice
(aka perfect streams) just fine, but may experience problems otherwise
(e.g. input stream with re-ordered B-frames and/or with frame dropping).
The re-ordering approach re-assigns incoming timestamps in ascending order
to incoming buffers and offers an alternative in such cases. In cases where
that might fail, the remaining method can be tried, which is exact and
according to specs, but might experience playback on not so spec-wise players.
Note that this latter approach also requires one to enable
presentation-timestamp.
</p>
<p>
</p>
<div class="refsect2">
<a name="idp9390112"></a><h3>Example pipelines</h3>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch v4l2src num<span class="gtkdoc opt">-</span>buffers<span class="gtkdoc opt">=</span><span class="number">50</span> <span class="gtkdoc opt">!</span> queue <span class="gtkdoc opt">!</span> ffenc_h263 <span class="gtkdoc opt">!</span> gppmux <span class="gtkdoc opt">!</span> filesink location<span class="gtkdoc opt">=</span>video<span class="number">.3</span>gp</pre></td>
</tr>
</tbody>
</table>
</div>
Records a video stream captured from a v4l2 device, encodes it into H.263
and muxes it into an 3gp file.
</div>
<p>
</p>
<p>
Documentation last reviewed on 2011-04-21
</p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="idp9127472"></a><h3>Element Information</h3>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">plugin</span></p></td>
<td>
<a class="link" href="gst-plugins-good-plugins-plugin-isomp4.html#plugin-isomp4">isomp4</a>
</td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Thiago Sousa Santos <thiagoss@embedded.ufcg.edu.br></td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Codec/Muxer</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="idp7908416"></a><h3>Element Pads</h3>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>audio_%d</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>sink</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>request</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>audio/AMR, rate=(int)8000, channels=(int)[ 1, 2 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> audio/AMR-WB, rate=(int)16000, channels=(int)[ 1, 2 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> audio/mpeg, mpegversion=(int)1, layer=(int)3, channels=(int)[ 1, 2 ], rate=(int)[ 1, 2147483647 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> audio/mpeg, mpegversion=(int)4, stream-format=(string)raw, channels=(int)[ 1, 8 ], rate=(int)[ 1, 2147483647 ]</td>
</tr>
</tbody>
</table></div>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>video_%d</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>sink</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>request</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>video/x-h263, width=(int)[ 16, 4096 ], height=(int)[ 16, 4096 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/mpeg, mpegversion=(int)4, systemstream=(boolean)false, width=(int)[ 16, 4096 ], height=(int)[ 16, 4096 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-divx, divxversion=(int)5, width=(int)[ 16, 4096 ], height=(int)[ 16, 4096 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-h264, stream-format=(string)avc, alignment=(string)au, width=(int)[ 16, 4096 ], height=(int)[ 16, 4096 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
</tbody>
</table></div>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>src</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>source</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>always</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>video/quicktime, variant=(string)3gpp</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-3gppmux.details"></a><h2>Details</h2>
</div>
</div>
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