The sound doesn't match the actors' lips. How do I fix lip-sync delay?

Lip-sync error is a processing mismatch, not a fault. TVs take longer to process video (scaling, motion smoothing, HDR mapping) than AVRs take to decode audio, so the voice arrives a few tens of milliseconds before the lips move. Once set, it rarely needs touching again.

The order I fix it in:

Put the TV in game or low-latency mode for that source. Less video processing, less delay. On many TVs this alone brings audio and picture into step, at the small cost of losing motion interpolation you probably did not want anyway.

Use the AVR's audio delay adjustment, sometimes labelled lip-sync or AV sync. Play a dialogue-heavy scene, add delay until the words lock to the mouths, then leave it. Typical values are tens of milliseconds, and the right number depends on your TV's processing, so there is no universal figure. Set it per input if the AVR allows; a games console and a Blu-ray player will not want the same value.

Enable auto lip-sync over HDMI on both the TV and the AVR. The two then negotiate the delay automatically. It works, though not always perfectly, which is why I set the manual value as a fallback and check the auto result against a scene I know.

If the drift appears on one streaming app only, restart the app before blaming the system. Streaming apps buffer audio and video separately and occasionally lose sync on their own; the AVR gets blamed for the app's mistake.

Where does the rule stop mattering? Small offsets are invisible to most people, and the sync tolerance for speech is wide enough that a few milliseconds either way go unnoticed. What people notice is drift, where the offset changes during viewing. That points at the app or the ARC link rather than a fixed delay, and no delay setting cures a moving target.

Still out of step after all four? Tell us the source, TV and AVR models and how the audio is routed (through the TV or straight to the AVR). The path decides which of these applies.