Have you consulted the
Json Feed Spec? That's a good place to start for understanding the feed file and how it is composed. Additionally, searching this forum should provide insight into general questions. If you have specific questions, please post those.
FREE Windows desktop software for converting Direct Publisher channels to SceneGraph (SDK), for creating
BIF (Trick Play) files,
Roku (MRSS, JSON) feed files, and
FireTV feed files @
GitHub/rrirower.