What Causes Audio/Video Sync Problems?
The most common reason audio and video gets out of sync is due to audio processing speed. Audio often processes a lot faster than video, particularly 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 to do a lot of video processing to the incoming signal (such as upscaling), the audio and video can get out of sync, with the audio arriving before the video (or vice versa).
How to Fix Audio/Video Sync Problems
Depending on your TV, home theater receiver, or sound bar, the exact steps you take may vary. Furthermore, not all displays have the same features, so it’s likely not every solution will be available to you with a single display.
Modify Your Connection Set Up
If provided settings and other tools don’t solve the problem, you can also try modifying your connection setup. For DVD, Blu-ray, and Ultra HD Blu-ray disc players, try splitting your audio and video connections between the TV (or video projector) and home theater receiver. Instead of connecting the HDMI output of your player to a home theater receiver for both audio and video, connect the HDMI output of your player directly to the TV for video only, and make a separate connection to your home theater receiver for audio only.
