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/usr/share/glib-2.0/schemas/mediascanner.gschema.xml is in libmediascanner-1.0-1 0.3.93+14.04.20131024.1-0ubuntu1.

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<schemalist>
  <schema id="com.canonical.mediascanner"
          path="/com/canonical/mediascanner/"
          gettext-domain="mediascanner">

    <key name="mandatory-containers" type="a(ss)">
      <summary>List of mandatory container types</summary>

      <description>
        A list of the required multimedia container types. Each element is a
        pair of two strings, where the first element is the container format's
        name, and the second element is the GStreamer capabilities describing
        the container type.
      </description>

      <default>
        [
          ("PCM Audio", "audio/x-wav"),
          ("MPEG-TS", "video/mpegts"),
          ("MP4 File", "video/quicktime, variant=iso"),
          ("OGG File", "application/ogg; audio/ogg; video/ogg"),
          ("AVI File", "video/x-msvideo"),
          ("Matroska File", "audio/x-matroska; video/x-matroska; audio/webm; video/webm")
        ]
      </default>
    </key>

    <key name="mandatory-decoders" type="a(ss)">
      <summary>List of mandatory media decoder types</summary>

      <description>
        A list of the required multimedia formats. Each element is a pair of
        two strings, where the first element is the format's name, and the
        second element is the GStreamer capabilities describing the format.
      </description>

      <default>
        [
          ("A/52, AC3 (Dolby Digital) Audio", "audio/x-ac3; audio/ac3"),
          ("DTS Audio", "audio/x-dts"),
          ("MP3 Audio", "audio/mpeg, mpegversion=(int)1, layer=(int)3"),
          ("AAC Audio", "audio/mpeg, mpegversion=(int)2, stream-format=adts; audio/mpeg, mpegversion=(int)4, stream-format=adts"),
          ("MPEG-4 Audio", "audio/mpeg,mpegversion=(int)4"),
          ("Vorbis Audio", "audio/x-vorbis"),
          ("Flac Audio", "audio/x-flac"),

          ("Windows Bitmap", "image/bmp"),
          ("GIF Image", "image/gif"),
          ("JPEG Image", "image/jpeg"),
          ("PNG Image", "image/png"),
          ("SVG Image", "image/svg; image/svg+xml"),
          ("TIFF Image", "image/tiff"),
          ("Targa Image", "image/x-tga"),

          ("H.262/MPEG-2 Part 2 Video", "video/mpeg, mpegversion=(int)2"),
          ("H.264/MPEG-4 Part 2 Video", "video/mpeg, mpegversion=(int)4"),
          ("H.264/MPEG-4 AVC (MPEG-4 Part 10) Video", "video/x-h264"),
          ("Theora Video", "video/x-theora"),
          ("VC-1 (Windows Media) Video", "video/x-wmv"),
          ("VP8 Video", "video/x-vp8")
        ]
      </default>
    </key>

    <key name="media-roots" type="as">
      <summary>List folders to monitor</summary>
      <default>["user:download", "user:music", "user:pictures", "user:videos"]</default>
    </key>

    <key name="metadata-sources" type="a(ssa{ss})">
      <summary>List of metadata sources to consult</summary>

      <description>
       A List of metadata sources to consult. The first element is the Grilo
       source ID. The second element is the plugin ID. The third element is a
       dictionary of strings describing configuration parameters like API keys.
      </description>

      <default>[]</default>
    </key>
  </schema>
</schemalist>