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

<plugin>
  <name>subenc</name>
  <description>subtitle encoders</description>
  <filename>../../gst/subenc/.libs/libgstsubenc.so</filename>
  <basename>libgstsubenc.so</basename>
  <version>1.15.2.1</version>
  <license>LGPL</license>
  <source>gst-plugins-bad</source>
  <package>GStreamer Bad Plug-ins git</package>
  <origin>Unknown package origin</origin>
  <elements>
    <element>
      <name>srtenc</name>
      <longname>Srt encoder</longname>
      <class>Codec/Encoder/Subtitle</class>
      <description>Srt subtitle encoder</description>
      <author>Thijs Vermeir &lt;thijsvermeir@gmail.com&gt;</author>
      <pads>
        <caps>
          <name>sink</name>
          <direction>sink</direction>
          <presence>always</presence>
          <details>text/x-raw, format=(string){ pango-markup, utf8 }</details>
        </caps>
        <caps>
          <name>src</name>
          <direction>source</direction>
          <presence>always</presence>
          <details>application/x-subtitle</details>
        </caps>
      </pads>
    </element>
    <element>
      <name>webvttenc</name>
      <longname>WebVTT encoder</longname>
      <class>Codec/Encoder/Subtitle</class>
      <description>WebVTT subtitle encoder</description>
      <author>David Schleef &lt;ds@schleef.org&gt;</author>
      <pads>
        <caps>
          <name>sink</name>
          <direction>sink</direction>
          <presence>always</presence>
          <details>text/x-raw, format=(string){ pango-markup, utf8 }</details>
        </caps>
        <caps>
          <name>src</name>
          <direction>source</direction>
          <presence>always</presence>
          <details>application/x-subtitle-vtt</details>
        </caps>
      </pads>
    </element>
  </elements>
</plugin>