gstreamer/docs/plugins/inspect/plugin-alpha.xml

<plugin>
  <name>alpha</name>
  <description>adds an alpha channel to video - constant or via chroma-keying</description>
  <filename>../../gst/alpha/.libs/libgstalpha.so</filename>
  <basename>libgstalpha.so</basename>
  <version>0.10.8.1</version>
  <license>LGPL</license>
  <source>gst-plugins-good</source>
  <package>GStreamer Good Plug-ins CVS/prerelease</package>
  <origin>http://gstreamer.freedesktop.org</origin>
  <elements>
    <element>
      <name>alpha</name>
      <longname>Alpha filter</longname>
      <class>Filter/Effect/Video</class>
      <description>Adds an alpha channel to video - uniform or via chroma-keying</description>
      <author>Wim Taymans &lt;wim@fluendo.com&gt;
    Edward Hervey &lt;edward.hervey@collabora.co.uk&gt;
    Jan Schmidt &lt;thaytan@noraisin.net&gt;</author>
      <pads>
        <caps>
          <name>sink</name>
          <direction>sink</direction>
          <presence>always</presence>
          <details>video/x-raw-yuv, format=(fourcc)AYUV, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]; video/x-raw-yuv, format=(fourcc)I420, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</details>
        </caps>
        <caps>
          <name>src</name>
          <direction>source</direction>
          <presence>always</presence>
          <details>video/x-raw-yuv, format=(fourcc)AYUV, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</details>
        </caps>
      </pads>
    </element>
  </elements>
</plugin>