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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
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<title>videomixer: GStreamer Good Plugins 1.0 Plugins Reference Manual</title>
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<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#gst-plugins-good-plugins-videomixer.description" class="shortcut">Description</a></span><span id="nav_hierarchy">  <span class="dim">|</span> 
                  <a href="#gst-plugins-good-plugins-videomixer.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_interfaces">  <span class="dim">|</span> 
                  <a href="#gst-plugins-good-plugins-videomixer.implemented-interfaces" class="shortcut">Implemented Interfaces</a></span><span id="nav_properties">  <span class="dim">|</span> 
                  <a href="#gst-plugins-good-plugins-videomixer.properties" class="shortcut">Properties</a></span>
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<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
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</tr></table>
<div class="refentry">
<a name="gst-plugins-good-plugins-videomixer"></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-videomixer.top_of_page"></a>videomixer</span></h2>
<p>videomixer</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-videomixer.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" 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"><a class="link" href="gst-plugins-good-plugins-videomixer.html#GstVideoMixer2Background" title="enum GstVideoMixer2Background"><span class="type">GstVideoMixer2Background</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-videomixer.html#GstVideoMixer2--background" title="The “background” property">background</a></td>
<td class="property_flags">Read / Write</td>
</tr></tbody>
</table></div>
</div>
<a name="GstVideoMixer2"></a><div class="refsect1">
<a name="gst-plugins-good-plugins-videomixer.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-good-plugins-videomixer.html#GstVideoMixer2-struct" title="struct GstVideoMixer2">GstVideoMixer2</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="gst-plugins-good-plugins-videomixer.html#GstVideoMixer2Background" title="enum GstVideoMixer2Background">GstVideoMixer2Background</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-videomixer.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="../gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
    <span class="lineart">╰──</span> <a href="../gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
        <span class="lineart">╰──</span> <a href="../gstreamer-1.0/GstObject.html#GstObject-struct">GstObject</a>
            <span class="lineart">╰──</span> <a href="../gstreamer-1.0/GstElement.html#GstElement-struct">GstElement</a>
                <span class="lineart">╰──</span> GstVideoMixer2
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-videomixer.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GstVideoMixer2 implements
 <a href="../gstreamer-1.0/GstChildProxy.html#GstChildProxy-struct">GstChildProxy</a>.</p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-videomixer.description"></a><h2>Description</h2>
<p>Videomixer can accept AYUV, ARGB and BGRA video streams. For each of the requested
sink pads it will compare the incoming geometry and framerate to define the
output parameters. Indeed output video frames will have the geometry of the
biggest incoming video stream and the framerate of the fastest incoming one.</p>
<p>Videomixer will do colorspace conversion.</p>
<p>Individual parameters for each input stream can be configured on the
<span class="type">GstVideoMixer2Pad</span>.</p>
<div class="refsect2">
<a name="id-1.2.270.8.5"></a><h3>Sample 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
2
3
4
5
6
7
8</pre></td>
        <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> \
  videotestsrc pattern<span class="gtkdoc opt">=</span><span class="number">1</span> <span class="gtkdoc opt">!</span> \
  video<span class="gtkdoc opt">/</span>x<span class="gtkdoc opt">-</span>raw<span class="gtkdoc opt">,</span>format<span class="gtkdoc opt">=</span>AYUV<span class="gtkdoc opt">,</span>framerate<span class="gtkdoc opt">=</span>\<span class="gtkdoc opt">(</span>fraction\<span class="gtkdoc opt">)</span><span class="number">10</span><span class="gtkdoc opt">/</span><span class="number">1</span><span class="gtkdoc opt">,</span>width<span class="gtkdoc opt">=</span><span class="number">100</span><span class="gtkdoc opt">,</span>height<span class="gtkdoc opt">=</span><span class="number">100</span> <span class="gtkdoc opt">!</span> \
  videobox border<span class="gtkdoc opt">-</span>alpha<span class="gtkdoc opt">=</span><span class="number">0</span> top<span class="gtkdoc opt">=-</span><span class="number">70</span> bottom<span class="gtkdoc opt">=-</span><span class="number">70</span> right<span class="gtkdoc opt">=-</span><span class="number">220</span> <span class="gtkdoc opt">!</span> \
  videomixer name<span class="gtkdoc opt">=</span>mix <span class="gtkdoc kwc">sink_0</span><span class="gtkdoc opt">::</span>alpha<span class="gtkdoc opt">=</span><span class="number">0.7</span> <span class="gtkdoc kwc">sink_1</span><span class="gtkdoc opt">::</span>alpha<span class="gtkdoc opt">=</span><span class="number">0.5</span> <span class="gtkdoc opt">!</span> \
  videoconvert <span class="gtkdoc opt">!</span> xvimagesink \
  videotestsrc <span class="gtkdoc opt">!</span> \
  video<span class="gtkdoc opt">/</span>x<span class="gtkdoc opt">-</span>raw<span class="gtkdoc opt">,</span>format<span class="gtkdoc opt">=</span>AYUV<span class="gtkdoc opt">,</span>framerate<span class="gtkdoc opt">=</span>\<span class="gtkdoc opt">(</span>fraction\<span class="gtkdoc opt">)</span><span class="number">5</span><span class="gtkdoc opt">/</span><span class="number">1</span><span class="gtkdoc opt">,</span>width<span class="gtkdoc opt">=</span><span class="number">320</span><span class="gtkdoc opt">,</span>height<span class="gtkdoc opt">=</span><span class="number">240</span> <span class="gtkdoc opt">!</span> mix<span class="gtkdoc opt">.</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>
 A pipeline to demonstrate videomixer used together with videobox.
This should show a 320x240 pixels video test source with some transparency
showing the background checker pattern. Another video test source with just
the snow pattern of 100x100 pixels is overlaid on top of the first one on
the left vertically centered with a small transparency showing the first
video test source behind and the checker pattern under it. Note that the
framerate of the output video is 10 frames per second.
<div class="informalexample">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
2
3
4
5</pre></td>
        <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> videotestsrc pattern<span class="gtkdoc opt">=</span><span class="number">1</span> <span class="gtkdoc opt">!</span> \
  video<span class="gtkdoc opt">/</span>x<span class="gtkdoc opt">-</span>raw<span class="gtkdoc opt">,</span> framerate<span class="gtkdoc opt">=</span>\<span class="gtkdoc opt">(</span>fraction\<span class="gtkdoc opt">)</span><span class="number">10</span><span class="gtkdoc opt">/</span><span class="number">1</span><span class="gtkdoc opt">,</span> width<span class="gtkdoc opt">=</span><span class="number">100</span><span class="gtkdoc opt">,</span> height<span class="gtkdoc opt">=</span><span class="number">100</span> <span class="gtkdoc opt">!</span> \
  videomixer name<span class="gtkdoc opt">=</span>mix <span class="gtkdoc opt">!</span> videoconvert <span class="gtkdoc opt">!</span> ximagesink \
  videotestsrc <span class="gtkdoc opt">!</span>  \
  video<span class="gtkdoc opt">/</span>x<span class="gtkdoc opt">-</span>raw<span class="gtkdoc opt">,</span> framerate<span class="gtkdoc opt">=</span>\<span class="gtkdoc opt">(</span>fraction\<span class="gtkdoc opt">)</span><span class="number">5</span><span class="gtkdoc opt">/</span><span class="number">1</span><span class="gtkdoc opt">,</span> width<span class="gtkdoc opt">=</span><span class="number">320</span><span class="gtkdoc opt">,</span> height<span class="gtkdoc opt">=</span><span class="number">240</span> <span class="gtkdoc opt">!</span> mix<span class="gtkdoc opt">.</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>
 A pipeline to demostrate bgra mixing. (This does not demonstrate alpha blending). 
<div class="informalexample">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
2
3
4
5</pre></td>
        <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> videotestsrc pattern<span class="gtkdoc opt">=</span><span class="number">1</span> <span class="gtkdoc opt">!</span> \
  video<span class="gtkdoc opt">/</span>x<span class="gtkdoc opt">-</span>raw<span class="gtkdoc opt">,</span>format <span class="gtkdoc opt">=</span>I420<span class="gtkdoc opt">,</span> framerate<span class="gtkdoc opt">=</span>\<span class="gtkdoc opt">(</span>fraction\<span class="gtkdoc opt">)</span><span class="number">10</span><span class="gtkdoc opt">/</span><span class="number">1</span><span class="gtkdoc opt">,</span> width<span class="gtkdoc opt">=</span><span class="number">100</span><span class="gtkdoc opt">,</span> height<span class="gtkdoc opt">=</span><span class="number">100</span> <span class="gtkdoc opt">!</span> \
  videomixer name<span class="gtkdoc opt">=</span>mix <span class="gtkdoc opt">!</span> videoconvert <span class="gtkdoc opt">!</span> ximagesink \
  videotestsrc <span class="gtkdoc opt">!</span> \
  video<span class="gtkdoc opt">/</span>x<span class="gtkdoc opt">-</span>raw<span class="gtkdoc opt">,</span>format<span class="gtkdoc opt">=</span>I420<span class="gtkdoc opt">,</span> framerate<span class="gtkdoc opt">=</span>\<span class="gtkdoc opt">(</span>fraction\<span class="gtkdoc opt">)</span><span class="number">5</span><span class="gtkdoc opt">/</span><span class="number">1</span><span class="gtkdoc opt">,</span> width<span class="gtkdoc opt">=</span><span class="number">320</span><span class="gtkdoc opt">,</span> height<span class="gtkdoc opt">=</span><span class="number">240</span> <span class="gtkdoc opt">!</span> mix<span class="gtkdoc opt">.</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>
 A pipeline to test I420
<div class="informalexample">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8</pre></td>
        <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> videomixer name<span class="gtkdoc opt">=</span>mixer <span class="gtkdoc kwc">sink_1</span><span class="gtkdoc opt">::</span>alpha<span class="gtkdoc opt">=</span><span class="number">0.5</span> <span class="gtkdoc kwc">sink_1</span><span class="gtkdoc opt">::</span>xpos<span class="gtkdoc opt">=</span><span class="number">50</span> <span class="gtkdoc kwc">sink_1</span><span class="gtkdoc opt">::</span>ypos<span class="gtkdoc opt">=</span><span class="number">50</span> <span class="gtkdoc opt">!</span> \
  videoconvert <span class="gtkdoc opt">!</span> ximagesink \
  videotestsrc pattern<span class="gtkdoc opt">=</span>snow timestamp<span class="gtkdoc opt">-</span>offset<span class="gtkdoc opt">=</span><span class="number">3000000000</span> <span class="gtkdoc opt">!</span> \
  <span class="string">&quot;video/x-raw,format=AYUV,width=640,height=480,framerate=(fraction)30/1&quot;</span> <span class="gtkdoc opt">!</span> \
  timeoverlay <span class="gtkdoc opt">!</span> queue2 <span class="gtkdoc opt">!</span> mixer<span class="gtkdoc opt">.</span> \
  videotestsrc pattern<span class="gtkdoc opt">=</span>smpte <span class="gtkdoc opt">!</span> \
  <span class="string">&quot;video/x-raw,format=AYUV,width=800,height=600,framerate=(fraction)10/1&quot;</span> <span class="gtkdoc opt">!</span> \
  timeoverlay <span class="gtkdoc opt">!</span> queue2 <span class="gtkdoc opt">!</span> mixer<span class="gtkdoc opt">.</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>
 A pipeline to demonstrate synchronized mixing (the second stream starts after 3 seconds)
</div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.270.8.6.1"></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-videomixer.html#plugin-videomixer">videomixer</a>
          </td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Wim Taymans &lt;wim@fluendo.com&gt;, Sebastian Dröge &lt;sebastian.droege@collabora.co.uk&gt;</td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Filter/Editor/Video/Compositor</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.270.8.6.2"></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>sink_%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/x-raw, format=(string){ AYUV, BGRA, ARGB, RGBA, ABGR, Y444, Y42B, YUY2, UYVY, YVYU, I420, YV12, NV12, NV21, Y41B, RGB, BGR, xRGB, xBGR, RGBx, BGRx }, 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, BGRA, ARGB, RGBA, ABGR, Y444, Y42B, YUY2, UYVY, YVYU, I420, YV12, NV12, NV21, Y41B, RGB, BGR, xRGB, xBGR, RGBx, BGRx }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-videomixer.functions_details"></a><h2>Functions</h2>
<p></p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-videomixer.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstVideoMixer2-struct"></a><h3>struct GstVideoMixer2</h3>
<pre class="programlisting">struct GstVideoMixer2;</pre>
<p>The opaque <a class="link" href="gst-plugins-good-plugins-videomixer.html#GstVideoMixer2"><span class="type">GstVideoMixer2</span></a> structure.</p>
</div>
<hr>
<div class="refsect2">
<a name="GstVideoMixer2Background"></a><h3>enum GstVideoMixer2Background</h3>
<p>The different backgrounds videomixer can blend over.</p>
<div class="refsect3">
<a name="GstVideoMixer2Background.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="VIDEO-MIXER2-BACKGROUND-CHECKER:CAPS"></a>VIDEO_MIXER2_BACKGROUND_CHECKER</p></td>
<td class="enum_member_description">
<p>checker pattern background</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIDEO-MIXER2-BACKGROUND-BLACK:CAPS"></a>VIDEO_MIXER2_BACKGROUND_BLACK</p></td>
<td class="enum_member_description">
<p>solid color black background</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIDEO-MIXER2-BACKGROUND-WHITE:CAPS"></a>VIDEO_MIXER2_BACKGROUND_WHITE</p></td>
<td class="enum_member_description">
<p>solid color white background</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIDEO-MIXER2-BACKGROUND-TRANSPARENT:CAPS"></a>VIDEO_MIXER2_BACKGROUND_TRANSPARENT</p></td>
<td class="enum_member_description">
<p>background is left transparent and layers are composited using "A OVER B" composition rules. This is only applicable to AYUV and ARGB (and variants) as it preserves the alpha channel and allows for further mixing.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
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<div class="refsect1">
<a name="gst-plugins-good-plugins-videomixer.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstVideoMixer2--background"></a><h3>The <code class="literal">“background”</code> property</h3>
<pre class="programlisting">  “background”               <a class="link" href="gst-plugins-good-plugins-videomixer.html#GstVideoMixer2Background" title="enum GstVideoMixer2Background"><span class="type">GstVideoMixer2Background</span></a></pre>
<p>Background type.</p>
<p>Flags: Read / Write</p>
<p>Default value: Checker pattern</p>
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