How to Fix Audio/Video Lag on Your TV | The Master Switch
Apantac APA-HDMI-DE HDMI Audio De Embedder with Audio Delay up to 2700 ms - Walmart.com
Audio Delay on Samsung TV? Try These 17 Fixes - Techzillo
EETimes - HDMI's Lip Sync and audio-video synchronization for broadcast and home video
Considerable lag on a Sonos Beam when going from PCM to Dolby Digital on a 2017 Samsung TV and an Apple TV as the source. I tried both HDMI and optical adaptor.
Digital Audio Delay (Lip Sync) - J.S. Technology Ltd