Sam:
Welcome to the PD11 forum. Burning a disk involves "finalizing" it so that it can be read by a DVD player. That requires that the disk be empty prior to burning.
It sounds to me, and I could be mistaken, that what you want to do is save your scenes as data files (mpeg2). That you can do. Just PRODUCE, not CREATE DISK, and then add that resulting produced file to your RW disk using Windows Explorer. That DVD can be read by your computer (Windows Media Player, Power DVD, etc.), but won't be readable in most DVD players.
Hope this helps. Have a great day.
Regards,
-Phil
Windows 10 Pro x64
Dell XPS 8930
Intel CoreT i7 (4.6 GHz)
32 GB DDR4-2666 RAM
1 TB PCIe -x4 SSD
NVIDIA GeForce RTX 2060
PD14 Ultimate x64, 4207
CD4 Ultra and AD6 Ultra
Bleeping Computer Malware Response Instructor