This looks like a large change but the relevant change is binka_ue_file_header.h. Then rebuilt libs, and a bunch of source changes that never made it over in the initial checkin.
#jira UE-119962
#preflight 60fb20bc391d460001ff28a5
[CL 16942270 by Dan Thompson in ue5-main branch]
Unreal side of the encoder. Mostly just a thunk to the SDK, with some interleaving and splitting for the Unreal streaming system.
[CL 16679911 by Dan Thompson in ue5-main branch]