Lip sync describes the alignment between the sound and picture of a programme. A visible mismatch can originate in the source, decoding, audio processing or display chain. Some equipment offers a timing adjustment, but identifying whether the problem affects one programme, one app or every source helps avoid applying a correction too widely.
A practical example
A soundbar may add processing delay that makes speech arrive after the mouth movement on screen. A supported timing adjustment can help that arrangement, while a single badly timed programme might need source-side attention instead of a permanent television setting.
A common misunderstanding
Do not apply one large global correction before comparing other content. A setting that fixes one unusual source can introduce an opposite mismatch on programmes that were already aligned correctly.
Related terms
Stable technical definition. Editorial approach