Advertisements I'm experiencing a consistent audio synchronization issue (the audio is about half a second behind the video). The delay can be reduced by setting the output to PCM, but it happens consistenly when the audio setting is Dolby Digital. This started happening several weeks ago - nothing had changed otherwise. My tivo (roamio pro) is connected to my TV via HDMI, and the TV connects to a soundbar via optical. My TV is a TCL Series 6 Roku and my sound bar is a Vizio 5.1.