| Initial addition results with duplicates: |
| sd 0 (size 4), Content light level metadata |
| sd 1 (size 4), H.26[45] User Data Unregistered SEI message: 1 |
| sd 2 (size 4), H.26[45] User Data Unregistered SEI message: 2 |
| sd 3 (size 4), H.26[45] User Data Unregistered SEI message: 3 |
| sd 4 (size 4), Spherical Mapping |
| sd 5 (size 4), H.26[45] User Data Unregistered SEI message: 4 |
| sd 6 (size 4), H.26[45] User Data Unregistered SEI message: 5 |
| sd 7 (size 4), H.26[45] User Data Unregistered SEI message: 6 |
| |
| Final state after a single 'no-duplicates' addition: |
| sd 0 (size 4), Content light level metadata |
| sd 1 (size 4), Spherical Mapping |
| sd 2 (size 4), H.26[45] User Data Unregistered SEI message: 1337 |
