GstTocScope

global TOC representing all selectable options (this is what applications are usually interested in)

TOC for the currently active/selected stream (this is a TOC representing the current stream from start to EOS, and is what a TOC writer / muxer is usually interested in; it will usually be a subset of the global TOC, e.g. just the chapters of the current title, or the chapters selected for playback from the current title)