Fixing AC-3 Audio Issues in Windows 11 24H2: A Quick Guide

If you’ve recently upgraded your PC to Windows 11 24H2 and noticed some media files have no audio, the issue might be the missing AC-3 codec. Also known as Dolby Digital, this codec is crucial for playing multi-channel surround sound audio.

I personaly faced the problem when I tried to run Plex Desktop on a newly installed Windows 11 24H2 installation. Some of my media files had no audio.

Why the AC-3 Codec is Missing

The AC-3 codec, also known as Dolby Digital, was previously included in Windows. However, starting with Windows 11 24H2, Microsoft has removed it from new installations. That said, there are exceptions:

• Upgraded Systems: If you upgraded from an earlier version of Windows, the codec will remain available.
• Pre-installed Codecs: Some manufacturers include the codec with their devices, ensuring AC-3 encoded media plays correctly.

If your system doesn’t fall under these categories, you’ll need to manually add the codec to restore audio functionality.

How to Fix the Problem

1. Download the Codecs:
   • 

     Dolby_AC4_AC3_Installer.zip

     Dolby AC-3/AC-4 Installer includes the necessary installers for Dolby AC-3 and AC-4 audio technologies. These technologies are essential for integrating Dolby AC-3 and AC-4 into your multimedia applications and ensuring high-quality audio playback on your system.

     This download contains:
     Dolby AC-3: 1.1.285.0
     Dolby AC-4: 1.0.0

     md5: 70789be7d1d22ea87e17aa298a59058f

     Terms and Conditions

     By downloading this free software, you agree that it is provided "as is" without any warranty. The author is not liable for any damages or losses resulting from its use. You are solely responsible for any consequences of installing and using this software.

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     4430 downloads42.03 MB
2. Install and Restart: Run the installers, then reboot your system to apply the changes.

Once installed, Windows will correctly play media files encoded with AC-3, restoring your surround sound experience.

Final Thoughts

For Plex users, losing audio on certain media can be frustrating, but this simple solution quickly resolves the problem. With the Dolby AC-3 codec reinstalled, your Windows 11 24H2 media PC will support all your surround sound files.

For more details, check out the Microsoft Support page on codecs in Media Player.

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