This article explains how to troubleshoot audio and video sync issues in your home theater system. When the audio you're hearing doesn't match the video you're watching, it can be quite frustrating, and especially noticeable on close-up footage of people talking (hence the term lip-sync).
HOW TO FIX 4K TV LIP SYNC ISSUES AND AUDIO DELAY
The most common reason for audio and video to be out of sync is the speed of audio processing. Audio is often processed much faster than video, especially when it comes to 4K videos. High-resolution video files take up a lot of space, and as a result, it can take longer to process a video signal than an audio signal.
If your receiver or display is set up to do a lot of video processing on the incoming signal (such as upscaling), the audio and video may become out of sync, with the audio arriving before the video (or vice versa).
Depending on your TV, home theater receiver, or soundbar, the exact steps you take may vary. Additionally, not all displays have the same features, so it’s likely that not every solution will be available to you with a single display.
