why VideoProcessor use dx12 and DesktopDuplicator use dx11?

[20170819]

hello ,everyone
1、Why VideoProcessor use dx12 and DesktopDuplicator use dx11?
2、Why DesktopDuplicator and encoder use diferrent adapter?
In my onpion,DesktopDuplicator and encoder on the same adaper, this is no need to share texure betwen tow adapters.
Thank you !