- Create: DoM can create Interop or SMPTE; we can't really disallow Interop at this time.
- Verify: warning about non-SMPTE.
-- Hint: TODO#1949
+- Hint: yes.
Don't have access to SMPTE ST 429-19 so I don't know what that requires.
- Create: can violate frame-rate constraints, but will only make Flat/Scope (unless an advanced option is ticked).
- Verify: yes.
-- Hint: TODO#1951
+- Hint: yes.
+
+We don't warn specifically about non-24fps 3D; maybe we should.
# 7.1.1 Active Image Area