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Correcting Audio Video Sync Problems in Home Theater

Audio and video do not match? See how to fix it

need to know

  • First choice: Disable video rendering settings on TV and home theater receiver, then re-enable video rendering settings.
  • Next option: Check the settings in the operating menu on the display or receiver. search for terms like audio sync, audio delayand lip sync.
  • Or disconnect the audio and video connections between the monitor and your receiver.

This article explains how to fix audio and video sync problems on your home theater. It can be pretty frustrating when the audio you hear doesn’t match the video you’re watching – and it’s especially noticeable in close-up footage of people talking (hence the term lip sync).

What causes audio/video sync issues?

Lifeguard / Luyi Wang

The most common reason audio and video are out of sync is due to audio processing speed. Audio is often processed much faster than video, especially when it comes to 4K videos. High-definition video files take up a lot of space, and as a result, the video signal may take longer to process than the audio signal.

If your receiver or monitor is configured to process a lot of video for the input signal (such as upscaling), the audio and video may be out of sync because the audio comes before the video (or vice versa).

Check if the problem is limited to a particular cable/satellite, streaming program or channel. For example, if you’re streaming a movie and have sync issues, it could be a temporary issue with your ISP or cable/satellite provider. If you can’t fix a sync issue, it’s probably out of your hands and will resolve itself over time.

How to fix audio/video sync issues?

Depending on your TV, home theater receiver, or soundbar, the exact steps you take may vary. Also, not all monitors have the same features, so not all solutions are available on a single monitor.

Disable all video processing settings on your TV, such as motion enhancement, video noise reduction, and other image enhancement features.

If you have a home theater receiver that performs video processing tasks, also disable all video processing on that device; You may be adding more delay by adjusting the video processing to take place on the TV and home theater receiver.

If changing the settings above fixes the situation, turn each rendering feature back on until the audio and video are out of sync. You can use this as your audio/video sync reference point.

If you are using a home theater receiver with Audio Return Channel over HDMI connection, you may have a setting to fix AV sync automatically or manually. In this case, try both options and see which gives the most consistent correction result.

If restricting the video processing capabilities of your TV or home theater receiver does not work, or you need to enable these features, check the settings in the operating menu of the monitor or receiver. search for terms like audio sync, audio delayand lip sync. Some soundbar systems also have a variation of this feature.

Regardless of the terms used, all of these tools offer settings that delay or delay the arrival of the audio signal to match the screenshot and soundtrack. Settings usually range from 10 ms to 100 ms, and sometimes up to 240 ms (millisecond = 1/1000 second).

Change your connection configuration

You can also try changing your connection configuration if the provided settings and other tools do not fix the problem.

For DVD, Blu-ray and Ultra HD Blu-ray players, try splitting your audio and video connections between your TV (or video projector) and home theater receiver.

Instead of connecting your player’s HDMI output to a home theater receiver for audio and video, connect the player’s HDMI output directly to the TV for video only, and make a separate connection to the home theater receiver for audio only.

If all the steps and tips above don’t fix the problem, turn everything off and reconnect the audio cables to the home theater receiver and the TV. Turn everything back on and see if it restarts.


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Correcting Audio Video Sync Problems in Home Theater

Voice and video don’t match? Here’s how to fix that

What to Know
First choice: Disable video-processing settings on TV and home theater receiver, then enable video-processing settings again.
Next option: Check settings in operating menu on display or receiver. Look for terms like Audio Sync, Audio Delay, and Lip Sync.
Or, separate audio and video connections between the display and your receiver.

This article explains how to fix audio and video syncing 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 images of people speaking (thus the term lip-sync).

What Causes Audio/Video Sync Problems?

Lifewire / Luyi Wang
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).

Check to see if the problem is limited to a specific cable/satellite, streaming program, or channel. For example, if you’re streaming a movie, and you experience sync issues, this could be a temporary glitch with your internet or cable/satellite provider. If you can’t fix a sync issue, chances are it’s out of your hands and will resolve itself in time.
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.

Disable all of the video-processing settings on your TV, such as motion enhancement, video noise reduction, and any other picture-enhancement features.

If you have a home theater receiver performing video-processing tasks, disable all of the video-processing on this device as well; you might be adding more delay by setting video processing to occur in both the TV and home theater receiver.

If changing the above settings corrects the situation, enable each processing feature again until the audio and video gets out of sync. You can use this as your audio/video sync reference point.

If you are using a home theater receiver that features Audio Return Channel via HDMI connection, you might have a setting available to correct AV sync automatically or manually. If so, try both options and see which one gives you the most consistent correction result.

If curtailing the TV or home theater receiver’s video-processing features doesn’t work, or you need to have those features on, check the settings available in the operating menu on your display or receiver. Look for terms like Audio Sync, Audio Delay, and Lip Sync. Some sound bar systems have a variation of this feature, too.

Regardless of the terms used, all these tools offer settings that slow down or delay the audio signal’s arrival so that image on the screen and audio soundtrack match. The settings usually range from 10ms to 100ms and sometimes up to 240 ms (millisecond = 1/1,000th of a second).
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.

If all of the above steps and tips fail to solve the problem, turn everything off and reconnect the audio cables to your home theater receiver and TV. Turn everything back on and see if it resets.

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