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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#gst-plugins-good-plugins-smptealpha.synopsis" class="shortcut">Top</a>
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<a href="#gst-plugins-good-plugins-smptealpha.description" class="shortcut">Description</a>
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<a href="#gst-plugins-good-plugins-smptealpha.object-hierarchy" class="shortcut">Object Hierarchy</a>
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<a href="#gst-plugins-good-plugins-smptealpha.properties" class="shortcut">Properties</a>
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<div class="refentry">
<a name="gst-plugins-good-plugins-smptealpha"></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-smptealpha.top_of_page"></a>smptealpha</span></h2>
<p>smptealpha — Apply the standard SMPTE transitions as alpha on video images</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gst-plugins-good-plugins-smptealpha.synopsis"></a><h2>Synopsis</h2>
<a name="GstSMPTEAlpha"></a><pre class="synopsis">struct <a class="link" href="gst-plugins-good-plugins-smptealpha.html#GstSMPTEAlpha-struct" title="struct GstSMPTEAlpha">GstSMPTEAlpha</a>;
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-smptealpha.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
+----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a>
+----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html">GstElement</a>
+----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseTransform.html">GstBaseTransform</a>
+----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideofilter.html#GstVideoFilter">GstVideoFilter</a>
+----GstSMPTEAlpha
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-smptealpha.properties"></a><h2>Properties</h2>
<pre class="synopsis">
"<a class="link" href="gst-plugins-good-plugins-smptealpha.html#GstSMPTEAlpha--border" title='The "border" property'>border</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write
"<a class="link" href="gst-plugins-good-plugins-smptealpha.html#GstSMPTEAlpha--depth" title='The "depth" property'>depth</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write
"<a class="link" href="gst-plugins-good-plugins-smptealpha.html#GstSMPTEAlpha--position" title='The "position" property'>position</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write
"<a class="link" href="gst-plugins-good-plugins-smptealpha.html#GstSMPTEAlpha--type" title='The "type" property'>type</a>" <span class="type">GstSMPTEAlphaTransitionType</span> : Read / Write
"<a class="link" href="gst-plugins-good-plugins-smptealpha.html#GstSMPTEAlpha--invert" title='The "invert" property'>invert</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-smptealpha.description"></a><h2>Description</h2>
<p>
smptealpha can accept an I420 or AYUV video stream. An alpha channel is added
using an effect specific SMPTE mask in the I420 input case. In the AYUV case,
the alpha channel is modified using the effect specific SMPTE mask.
</p>
<p>
The <span class="type">"position"</span> property is a controllabe double between 0.0 and
1.0 that specifies the position in the transition. 0.0 is the start of the
transition with the alpha channel to complete opaque where 1.0 has the alpha
channel set to completely transparent.
</p>
<p>
The <span class="type">"depth"</span> property defines the precision in bits of the mask.
A higher presision will create a mask with smoother gradients in order to
avoid banding.
</p>
<p>
</p>
<div class="refsect2">
<a name="idp74287824"></a><h3>Sample pipelines</h3>
<p>
Here is a pipeline to demonstrate the smpte transition :
</p>
<pre class="programlisting">
gst-launch-1.0 -v videotestsrc ! smptealpha border=20000 type=44
position=0.5 ! videomixer ! videoconvert ! ximagesink
</pre>
<p>
This shows a midway bowtie-h transition a from a videotestsrc to a
transparent image. The edges of the transition are smoothed with a
20000 big border.
</p>
</div>
<p>
</p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="idp71025712"></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-smpte.html#plugin-smpte">smpte</a>
</td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Wim Taymans <wim.taymans@gmail.com></td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Filter/Editor/Video</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="idp74118704"></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>sink</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>always</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>video/x-raw, format=(string)I420, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-raw, format=(string)YV12, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-raw, format=(string)AYUV, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-raw, format=(string)ARGB, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-raw, format=(string)BGRA, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-raw, format=(string)RGBA, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-raw, format=(string)ARGB, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</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/x-raw, format=(string)AYUV, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-raw, format=(string)ARGB, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-raw, format=(string)BGRA, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-raw, format=(string)RGBA, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-raw, format=(string)ARGB, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-smptealpha.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstSMPTEAlpha-struct"></a><h3>struct GstSMPTEAlpha</h3>
<pre class="programlisting">struct GstSMPTEAlpha;</pre>
<p>
</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-smptealpha.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstSMPTEAlpha--border"></a><h3>The <code class="literal">"border"</code> property</h3>
<pre class="programlisting"> "border" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write</pre>
<p>The border width of the transition.</p>
<p>Allowed values: >= 0</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSMPTEAlpha--depth"></a><h3>The <code class="literal">"depth"</code> property</h3>
<pre class="programlisting"> "depth" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write</pre>
<p>Depth of the mask in bits.</p>
<p>Allowed values: [1,24]</p>
<p>Default value: 16</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSMPTEAlpha--position"></a><h3>The <code class="literal">"position"</code> property</h3>
<pre class="programlisting"> "position" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write</pre>
<p>Position of the transition effect.</p>
<p>Allowed values: [0,1]</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSMPTEAlpha--type"></a><h3>The <code class="literal">"type"</code> property</h3>
<pre class="programlisting"> "type" <span class="type">GstSMPTEAlphaTransitionType</span> : Read / Write</pre>
<p>The type of transition to use.</p>
<p>Default value: A bar moves from left to right</p>
</div>
<hr>
<div class="refsect2">
<a name="GstSMPTEAlpha--invert"></a><h3>The <code class="literal">"invert"</code> property</h3>
<pre class="programlisting"> "invert" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write</pre>
<p>
Set to TRUE to invert the transition mask (ie. flip it horizontally).
</p>
<p>Default value: FALSE</p>
<p class="since">Since 0.10.23</p>
</div>
</div>
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