I am connecting a headset to a TV and Xfinity box plus an old VCR. There are 2 RCA plugs on the headset. I have no rca on the xfinity box or the tv. The present hookup is coaxial into the Xfinity box, hdmi out to hdmi in on the tv. The vcr hooks up directly to the tv via ?? (I can’t remember now, can’t get to the unit but it’s direct to the tv). I only have hdmi or usb on the tv that will take the headphones. Suggestions? I need the tv to mute while the headphones are being used. Thanks for any help.