Scripts (*.bat) files to quickly enable/disable NVFBC hardware encoder on HOST PC for compatible Nvidia cards. When NVFBC is disabled, Steam uses NVIFR. Try it if you want, works for me on Windows 7 64bit. So I no more need to uninstall/reinstall GeForce Experience to do this. Don't forget to restart Steam on HOST PC once the encoder is disabled/enabled. I expect that you need to have GeForce Experience installed in order to enable NVFBC.
https://steamcommunity.com/groups/homestream/discussions/0/490125103626704042