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                  <a href="#gst-plugins-good-plugins-3gppmux.description" class="shortcut">Description</a>
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<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>
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<a name="gst-plugins-good-plugins-3gppmux.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"></pre>
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<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 (3gppmux).
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.