Fix Audio Video Out of Sync in Windows: 7 Fixes

Audio and video falling out of sync in Windows is a common problem that can affect streaming services, local video players, and video conferencing apps. This guide walks you through the most effective fixes, from simple player settings to driver and system-level adjustments, so you can get your audio and video aligned again.

What You’ll Need

Administrator access to your Windows PC (for driver and system updates)
Your audio and video device names (found in Device Manager)
An internet connection for downloading drivers and updates

Step-by-Step

Restart your media player and PC. This clears temporary glitches in both the app and the system audio/video services. Close the player completely, then restart the computer if the issue persists.
Check the audio sync setting in your player. Most players (VLC, MPC-HC, Windows Media Player) have an audio delay or sync offset option. In VLC, go to Tools > Preferences > Audio and look for “Audio delay.” Set a positive value to delay audio, a negative value to advance it. Test with a known-good video to find the right offset.
Disable audio enhancements. Windows audio enhancements can introduce lag. Right-click the speaker icon in the system tray, select Sound settings > Sound Control Panel. On the Playback tab, right-click your default device, choose Properties, go to the Enhancements tab, and check “Disable all enhancements.” Apply and test.
Update or roll back your audio and video drivers. Outdated or buggy drivers are a leading cause. Open Device Manager (right-click Start), expand “Sound, video and game controllers” and “Display adapters.” Right-click each device and select Update driver > Search automatically. If the problem started after a recent update, use Properties > Driver > Roll Back Driver instead.
Change the audio format. Sometimes a mismatched sample rate causes drift. In the same Playback properties, go to the Advanced tab and try a different default format (e.g., 24-bit 48000 Hz). Test each option until sync improves.
Run the Windows Audio troubleshooter. Go to Settings > System > Troubleshoot > Other troubleshooters, select “Playing Audio,” and run it. This can automatically fix service or driver issues.
Check for system updates and codec packs. Go to Settings > Windows Update and install all pending updates. For local files, a broken codec can cause sync issues; installing a current codec pack (like K-Lite) can help, but uninstall old ones first.

Common Mistakes

Adjusting sync in the wrong app: A delay set in VLC won’t affect YouTube in your browser. Fix the issue in the app where the problem occurs.
Ignoring Bluetooth latency: Wireless headphones and speakers add inherent delay. If sync is only off with Bluetooth, the device is the cause, not Windows.
Changing global audio settings for one bad file: A single corrupt video file may be out of sync; altering system-wide settings can break other audio. Test with multiple files first.
Updating drivers from third-party sites: These often cause more problems. Always use Windows Update or the manufacturer’s official site.

Tips

Use the keyboard shortcut in VLC (usually K or J) to quickly nudge audio sync in real time while watching.
For streaming in a browser, try a different browser or disable hardware acceleration in the browser’s settings (often under Advanced).
Keep your graphics driver updated, as video decoding is often handled by the GPU; an old driver can cause both video stutter and audio drift.
If using an external monitor or TV, ensure it’s in “Game Mode” or “PC Mode” to reduce post-processing delay.

Troubleshooting

If the steps above don’t resolve the issue, try these additional checks:

Test with a different media player: If the problem is only in one app, reinstall that app or reset its settings to default.
Check the video file itself: Play a known-good video (e.g., a YouTube video) to see if the issue is file-specific. If only one file is bad, re-encode it or download a new copy.
Disable hardware acceleration in the player: In VLC, go to Tools > Preferences > Input/Codecs and set “Hardware-accelerated decoding” to “Disabled.” This shifts decoding to the CPU, which can fix GPU-related sync issues.
Check CPU usage: If your CPU is pegged at 100% during playback, background processes may be starving the player. Close unnecessary programs and check Task Manager.
Try a different audio output: Switch from speakers to headphones or vice versa. If sync is fine on one, the other output device has a driver or hardware issue.
Reinstall the audio driver: In Device Manager, right-click your audio device and select “Uninstall device” (check “Delete the driver software”), then restart. Windows will reinstall the default driver.

Frequently Asked Questions

Why does audio lag only in some apps and not others?

Different apps handle audio buffering and video decoding differently. An app with poor buffering or incompatible codec settings will show sync issues, while others compensate automatically. This is usually an app-specific setting, not a system problem.

Can a slow hard drive cause audio/video desync?

Yes. If the drive can’t read video data fast enough, the video may stutter and the audio (which is buffered separately) keeps playing, causing drift. Moving the file to an SSD or a faster drive often fixes this.

Does the HDMI cable affect audio sync?

Rarely, but a damaged or low-quality HDMI cable can cause intermittent signal issues, including audio dropouts or delay. Try a different cable, especially if you’re using a long run or an adapter.

Why does sync get worse the longer I watch?

This “drift” usually points to a sample rate mismatch. The audio is being played at a slightly different rate than it was recorded. Changing the default audio format in Windows (Step 5) is the most reliable fix.

Is there a way to fix sync for all videos at once?

No universal fix exists because the cause varies. However, setting a consistent audio format and disabling enhancements in Windows will resolve the most common system-wide causes. For individual files, use a player’s sync adjustment.

Will reinstalling Windows fix the problem?

Only if the issue is caused by corrupted system files or drivers. Since it’s usually an app or driver issue, try the steps above first. Reinstalling Windows is a last resort that may not solve a hardware-related delay.

General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.

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