We have several ways to get meta-data for your local media files.
  - MediaExport is where we walk the filesystem ourselves and find out
what we can
- Tracker is where we use the contents of the tracker semantic storage
to find out what we need.

The DIDL-Lite xml fragment associated to a media contains such metadata:

<res size="144424" colorDepth="32" resolution="1200x1200"
protocolInfo="http-get:*:image/png:DLNA.ORG_PN=PNG_LRG;DLNA.ORG_OP=01;DLNA.ORG_FLAGS=00f00000000000000000000000000000">

Which part of the source code should I watch to understand how it is produced?

That depends a bit on the Rygel version that you're trying to look at.

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