"HDCP unauthorised. Content disabled."

[lunacite]

Due to this processing requirement, there can be some lag if you aren't also using HDMI

My Roku connects via HDMI to the splitter, which connects via HDMI to the TV, which then sends audio to the sound bar.

So I should be good, I assume?

Yep, the audio and video lag are all occurring simultaneously, so you're fine.

[MadPick]

Good. As long as I'm completely lagging.