oh and the last time i checked, my Toshiba HD-DVD player worked just fine connected to my AV7702MKII output to my 4K TCL 65" 6 series so, it might be something with the SR7012.
best of luck getting this resolved.
TCL-65R615, 55P605 DV/HDR10 & 49S405 HDR10, Philips BDP7501, BPD7502 UHD Players
Oppo BDP-105D, 105, 93, Marantz AV7702MKII, NR1607. Xbox One S
Emotiva XPA5,UPA2, UPA200 & Mini X Amps
Speakers, Polk SDA-2, Monitor 10A & 5A, Axiom M80,
VP180, QS8, M2, QS4, ATMOS 7.1.4 & 5.1.2 NYGiants!