Media: Ensure we use a correct default duration
Media: Ensure we use a correct default duration

Using 0 as the default value would cause the VLCMetadataService to
wrongly assume the media was already parsed in case the media gets
loaded from the database (so, if the media isn't parsed during the first
application run)

chouquette/medialibrary,chouquette/medialibrary,chouquette/medialibrary,chouquette/medialibrary