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MISB uses User Defined Unregistered SEI messages for frame timestamp (ST 0604) and identifier (ST 2101). As far as I can tell, there is no way to expose that to a consumer (e.g. as a Meta).

For an example of this, see https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/uploads/addca4b4d4d9dca44456d0a5bcf6b8ed/klv_metadata_test_sync.ts