Fixing Audio That Leads or Lags Behind Video
First establish which arrives earlier. Adding audio delay can correct one problem while making the opposite problem worse.
If lips move before the words are heard, audio is behind the picture. If you hear a word before the corresponding lip movement, audio is ahead. Establish that direction before adjusting synchronization. Use clear speech or a suitable test clip; a kick recorded by a distant field microphone is not always a precise reference.
Isolate the source
Try another channel in the application, then content in another app. If one channel has the same fault on two devices, report its name and time before changing the whole television's settings. If every programme became affected after adding external speakers, start with the audio path.
Temporarily use only the television's speakers and compare them with the external system. Avoid both outputs playing together during the test, so speaker echo is not mistaken for picture synchronization trouble. Check the HDMI or wireless connection and software versions.
Adjust in the correct direction
Samsung's audio-delay guidance explains that increasing output delay can help when sound arrives before the image. If audio already arrives late, do not delay it further. Record the original value, make a small adjustment and test the same scene. Menu names and adjustment ranges vary by model.
When is dedicated calibration useful?
For compatible Apple TV wireless-audio arrangements, consult Apple's calibration guide. It addresses particular setups rather than every TV or app.
If the difference grows throughout playback, report that behaviour instead of compensating with a large fixed offset. After any change, test other content to ensure one channel has not been corrected at everyone else's expense. Keep the original value available for rollback.
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