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

<plugin>
  <name>png</name>
  <description>PNG plugin library</description>
  <filename>../../ext/libpng/.libs/libgstpng.so</filename>
  <basename>libgstpng.so</basename>
  <version>0.11.1</version>
  <license>LGPL</license>
  <source>gst-plugins-good</source>
  <package>GStreamer Good Plug-ins source release</package>
  <origin>Unknown package origin</origin>
  <elements>
    <element>
      <name>pngdec</name>
      <longname>PNG image decoder</longname>
      <class>Codec/Decoder/Image</class>
      <description>Decode a png video frame to a raw image</description>
      <author>Wim Taymans &lt;wim@fluendo.com&gt;</author>
      <pads>
        <caps>
          <name>sink</name>
          <direction>sink</direction>
          <presence>always</presence>
          <details>image/png</details>
        </caps>
        <caps>
          <name>src</name>
          <direction>source</direction>
          <presence>always</presence>
          <details>video/x-raw, format=(string){ RGBA, RGB }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</details>
        </caps>
      </pads>
    </element>
    <element>
      <name>pngenc</name>
      <longname>PNG image encoder</longname>
      <class>Codec/Encoder/Image</class>
      <description>Encode a video frame to a .png image</description>
      <author>Jeremy SIMON &lt;jsimon13@yahoo.fr&gt;</author>
      <pads>
        <caps>
          <name>sink</name>
          <direction>sink</direction>
          <presence>always</presence>
          <details>video/x-raw, format=(string){ RGBA, RGB, GRAY8 }, 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>image/png, width=(int)[ 16, 1000000 ], height=(int)[ 16, 1000000 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</details>
        </caps>
      </pads>
    </element>
  </elements>
</plugin>