The iTunes publisher plug-in collects the MPEG-2 transcoded file, and uses the media metadata assigned to the master asset, and generates the retailer-specific metadata file. These files are assembled into an iTunes package, which can then be delivered directly to Apple for ingestion into their video store.
In addition to Apple iTunes, several other digital retailer packages are supported by the RadiantGrid publishing services, as well as CableLabs 1.1 distribution packages.