gstreamer/docs/plugins/inspect/plugin-x264.xml

<plugin>
  <name>x264</name>
  <description>libx264-based H264 plugins</description>
  <filename>../../ext/x264/.libs/libgstx264.so</filename>
  <basename>libgstx264.so</basename>
  <version>0.10.15</version>
  <license>GPL</license>
  <source>gst-plugins-ugly</source>
  <package>GStreamer Ugly Plug-ins source release</package>
  <origin>Unknown package origin</origin>
  <elements>
    <element>
      <name>x264enc</name>
      <longname>x264enc</longname>
      <class>Codec/Encoder/Video</class>
      <description>H264 Encoder</description>
      <author>Josef Zlomek &lt;josef.zlomek@itonis.tv&gt;, Mark Nauwelaerts &lt;mnauw@users.sf.net&gt;</author>
      <pads>
        <caps>
          <name>sink</name>
          <direction>sink</direction>
          <presence>always</presence>
          <details>video/x-raw-yuv, format=(fourcc)I420, framerate=(fraction)[ 0/1, 2147483647/1 ], width=(int)[ 16, 2147483647 ], height=(int)[ 16, 2147483647 ]</details>
        </caps>
        <caps>
          <name>src</name>
          <direction>source</direction>
          <presence>always</presence>
          <details>video/x-h264, framerate=(fraction)[ 0/1, 2147483647/1 ], width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], stream-format=(string){ byte-stream, avc }</details>
        </caps>
      </pads>
    </element>
  </elements>
</plugin>