SVP is disabled while transcoding is running. This's by design.
I can't tell why mpv.exe gives "The procedure entry point ucrtbase.terminate could not be located in the dynamic link library api-ms-win-runtime-l1-1-0.dll" error for you. "api-ms-win-runtime-l1-1-0.dll" is a part of VC++ runtime, which indicates something is broken in your system, and it's NOT SVP's fault. You probably need to update your system via Windows Update.