1 There are a few places where languages need to be specified, and it's quite complicated.
5 At the time of writing this is specified per content, in the content audio tab. It is
8 - RFC5646SpokenLanguage metadata in sound MXF
14 This is also specified per content, in the content subtitle tab. It is used for writing:
16 - CPL MainSubtitleLanguageList (all languages present in the DCP)
17 - subtitle asset metadata