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<a name="gst-plugins-good-plugins-mp4mux"></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-mp4mux.top_of_page"></a>mp4mux</span></h2>
<p>mp4mux — Muxer for ISO MPEG-4 (.mp4) files</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-mp4mux.properties"></a><h2>Properties</h2>
<div class="informaltable"><table border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type"><span class="type">GstQTMuxDtsMethods</span></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux--dts-method" title="The “dts-method” property">dts-method</a></td>
<td class="property_flags">Read / Write / Construct</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux--faststart" title="The “faststart” property">faststart</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux--faststart-file" title="The “faststart-file” property">faststart-file</a></td>
<td class="property_flags">Read / Write / Construct</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux--fragment-duration" title="The “fragment-duration” property">fragment-duration</a></td>
<td class="property_flags">Read / Write / Construct</td>
</tr>
<tr>
<td class="property_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux--moov-recovery-file" title="The “moov-recovery-file” property">moov-recovery-file</a></td>
<td class="property_flags">Read / Write / Construct</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux--movie-timescale" title="The “movie-timescale” property">movie-timescale</a></td>
<td class="property_flags">Read / Write / Construct</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux--presentation-time" title="The “presentation-time” property">presentation-time</a></td>
<td class="property_flags">Read / Write / Construct</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux--streamable" title="The “streamable” property">streamable</a></td>
<td class="property_flags">Read / Write / Construct</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux--trak-timescale" title="The “trak-timescale” property">trak-timescale</a></td>
<td class="property_flags">Read / Write / Construct</td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstMP4Mux"></a><div class="refsect1">
<a name="gst-plugins-good-plugins-mp4mux.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="typedef_keyword">typedef</td>
<td class="function_name"><a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux">GstMP4Mux</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-mp4mux.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html">GstObject</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html">GstElement</a>
<span class="lineart">╰──</span> GstMP4Mux
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-mp4mux.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GstMP4Mux implements
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstTagSetter.html">GstTagSetter</a> and GstTagXmpWriter.</p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-mp4mux.description"></a><h2>Description</h2>
<p>This element merges streams (audio and video) into ISO MPEG-4 (.mp4) 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 (<a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux--movie-timescale" title="The “movie-timescale” property">movie-timescale</a>,</p>
<a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux--trak-timescale" title="The “trak-timescale” property">trak-timescale</a>) allow adjusting
<p>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 <a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux--faststart" title="The “faststart” property">faststart</a> 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 <a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux--fragment-duration" title="The “fragment-duration” property">fragment-duration</a>.
If such fragmented layout is intended for streaming purposes, then</p>
<a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux--streamable" title="The “streamable” property">streamable</a> allows foregoing to add
<p>index metadata (at the end of file).</p>
<a class="link" href="gst-plugins-good-plugins-mp4mux.html#GstMP4Mux--dts-method" title="The “dts-method” property">dts-method</a> allows selecting a
<p>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</p>
presentation-timestamp.
<div class="refsect2">
<a name="id-1.2.80.8.14"></a><h3>Example pipelines</h3>
<div class="informalexample"><pre class="programlisting">
gst-launch-1.0 gst-launch-1.0 v4l2src num-buffers=50 ! queue ! x264enc ! mp4mux ! filesink location=video.mp4
</pre></div>
Records a video stream captured from a v4l2 device, encodes it into H.264
and muxes it into an mp4 file.
</div>
<p>Documentation last reviewed on 2011-04-21</p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.80.8.15.1.1"></a><h3>Element Information</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<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="id-1.2.80.8.15.1.2"></a><h3>Element Pads</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>audio_%u</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/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>
<tr>
<td><p><span class="term"></span></p></td>
<td> audio/x-alac, channels=(int)[ 1, 2 ], rate=(int)[ 1, 2147483647 ]</td>
</tr>
</tbody>
</table></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>video_%u</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/mpeg, mpegversion=(int)4, systemstream=(boolean)false, width=(int)[ 16, 4096 ], height=(int)[ 16, 4096 ]</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 ]</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 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-mp4-part, width=(int)[ 16, 4096 ], height=(int)[ 16, 4096 ]</td>
</tr>
</tbody>
</table></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<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)iso</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-mp4mux.functions_details"></a><h2>Functions</h2>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-mp4mux.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstMP4Mux"></a><h3>GstMP4Mux</h3>
<pre class="programlisting">typedef struct _Gst3GPPMux GstMP4Mux;
</pre>
<p>
</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-mp4mux.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstMP4Mux--dts-method"></a><h3>The <code class="literal">“dts-method”</code> property</h3>
<pre class="programlisting"> “dts-method” <span class="type">GstQTMuxDtsMethods</span></pre>
<p>(DEPRECATED) Method to determine DTS time.</p>
<p>Flags: Read / Write / Construct</p>
<p>Default value: reorder</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMP4Mux--faststart"></a><h3>The <code class="literal">“faststart”</code> property</h3>
<pre class="programlisting"> “faststart” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>If the file should be formatted for faststart (headers first).</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMP4Mux--faststart-file"></a><h3>The <code class="literal">“faststart-file”</code> property</h3>
<pre class="programlisting"> “faststart-file” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</pre>
<p>File that will be used temporarily to store data from the stream when creating a faststart file. If null a filepath will be created automatically.</p>
<p>Flags: Read / Write / Construct</p>
<p>Default value: NULL</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMP4Mux--fragment-duration"></a><h3>The <code class="literal">“fragment-duration”</code> property</h3>
<pre class="programlisting"> “fragment-duration” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Fragment durations in ms (produce a fragmented file if > 0).</p>
<p>Flags: Read / Write / Construct</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMP4Mux--moov-recovery-file"></a><h3>The <code class="literal">“moov-recovery-file”</code> property</h3>
<pre class="programlisting"> “moov-recovery-file” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</pre>
<p>File to be used to store data for moov atom making movie file recovery possible in case of a crash during muxing. Null for disabled. (Experimental).</p>
<p>Flags: Read / Write / Construct</p>
<p>Default value: NULL</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMP4Mux--movie-timescale"></a><h3>The <code class="literal">“movie-timescale”</code> property</h3>
<pre class="programlisting"> “movie-timescale” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Timescale to use in the movie (units per second).</p>
<p>Flags: Read / Write / Construct</p>
<p>Allowed values: >= 1</p>
<p>Default value: 1000</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMP4Mux--presentation-time"></a><h3>The <code class="literal">“presentation-time”</code> property</h3>
<pre class="programlisting"> “presentation-time” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Calculate and include presentation/composition time (in addition to decoding time).</p>
<p>Flags: Read / Write / Construct</p>
<p>Default value: TRUE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMP4Mux--streamable"></a><h3>The <code class="literal">“streamable”</code> property</h3>
<pre class="programlisting"> “streamable” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>If set to true, the output should be as if it is to be streamed and hence no indexes written or duration written. (DEPRECATED, only valid for fragmented MP4).</p>
<p>Flags: Read / Write / Construct</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMP4Mux--trak-timescale"></a><h3>The <code class="literal">“trak-timescale”</code> property</h3>
<pre class="programlisting"> “trak-timescale” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Timescale to use for the tracks (units per second, 0 is automatic).</p>
<p>Flags: Read / Write / Construct</p>
<p>Default value: 0</p>
</div>
</div>
</div>
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