Blu-ray discs are widely used for storing high-definition video, and Blu-ray players have been available for quite some time. Blu-rays provide several benefits compared to DVDs, such as enhanced image quality and superior audio. Nevertheless, technical issues might lead to errors when using Blu-ray discs with the popular VLC media player.

In this guide, we'll discuss three solutions for resolving the "This Blu-ray disc needs a library for AACS decoding, and your system does not have it." error message in VLC media player. We'll also offer alternative methods to help you enjoy your Blu-ray discs seamlessly!

These solutions apply to Windows 10, Windows 8, and Windows 8.1.

Table of Contents

• What triggers the "Blu-ray disc needs a library" error?
• How to resolve the "Blu-ray disc needs a library" error in VLC media player
• Solution 1. Manually add library files to AACS
• Solution 2. Update VLC media player to the latest version
• Solution 3. Verify if your files are damaged

What triggers the "Blu-ray disc needs a library" error?

We've investigated this error and identified several common scenarios that could lead to this message.

• Protected Blu-ray discs — Most commercial Blu-ray discs are protected with AACS and BD+ encryption. To play these encrypted discs, VLC requires the libaacs library instead of the standard libbluray.
• Missing KeyDB.cfg file — A common cause of Blu-ray playback issues is the absence of the KeyDB.cfg file on your computer. This file is essential for the libaacs library to function.
• Outdated VLC player — VLC media player is open-source and has various unofficial versions. If you're using an outdated version with a known bug, it might cause errors when playing Blu-rays.
• Damaged media — If the data on your Blu-ray disc is corrupted, it won't play on any media player, including VLC.

If you're struggling with the "This Blu-ray disc needs a library for AACS decoding, and your system does not have it." error, this article will guide you through effective solutions that others have successfully used.

How to resolve the "Blu-ray disc needs a library" error in VLC media player

Many users experiencing issues with Blu-rays in VLC media player have successfully played their discs by manually adding certain AACS library files. While other solutions exist, this approach is often the most effective!

However, it's also possible that your file is damaged or incompatible with any player, not just VLC's default one. Here's how to check for damage and what steps you can take to recover your media.

Solution 1. Manually add library files to AACS

This solution is effective for most users. We recommend following all steps carefully to maximize your chances of resolving the "This Blu-ray disc needs a library for AACS decoding" issue in VLC player.

Warning: The following steps involve downloading files from a site without an SSL certificate. Proceed at your own risk.

1. Open this website in your preferred browser. You may encounter a "Your connection isn't private" warning. In most browsers, you can proceed by selecting advanced options.
2. Under the Keys database section, click on the “get the file” link to download the KeyDB.cfg file.
3. You may receive a warning about a potentially unsafe file. If so, click on the More options icon and choose to keep the file. We confirmed its safety as of October 2021.
4. Under the AACS Dynamic Library section, click on the download link corresponding to your system version. For a 64-bit Windows, select the “that file” link in the second line.
5. Navigate to your AppData folder:
   • Press the Windows + R keys to open the Run utility. Enter “C:\Users\Your username\AppData” (replace “Your username” with your account name) and press Enter.
   • Alternatively, use the Windows + E shortcut to open File Explorer, then go to This PC > C: > Users > Your username > AppData.
6. Open the Roaming folder.
7. Right-click in an empty area, select New folder, name it “aacs”, and open it.
8. Inside the "aacs" folder, drag the downloaded KeyDB.cfg file, typically found in your Downloads folder.
9. Navigate to the VLC media player installation folder, usually located at:
   1. C:\Program Files\VideoLAN\VLC
   2. C:\Program Files(x86)\VideoLAN\VLC
10. Drag the downloaded libaacs.dll file into the VLC installation folder, typically found in your Downloads folder.

After completing these steps, launch VLC media player and attempt to play the Blu-ray disc again. If successful, you should now be able to access its contents.

Solution 2. Update VLC media player to the latest version

Updating VLC media player to its latest version is advised by some users. This update can provide bug fixes, new features, and enhancements, potentially resolving the "This Blu-ray disc needs a library for AACS decoding" error, especially if you haven't updated in a while.

1. Open VLC media player. From the top menu, select Help > Check for updates.
2. If a new version is available, you'll see a message like: "A new version of VLC (X.X.X) is available. VideoLAN and the VLC development team present VLC X.0 “Vetinari”. VLC X.0 is a major update to VLC, introducing hardware decoding by default, allowing 4K with low-cpu usage (and 8K on recent machines), supporting HDR and 360 video. It also improves audio passthrough, allows streaming to ChromeCast, Blu-rays and local network drive browsing. Do you want to download it?"
3. Click Yes to initiate the download. Ensure a stable internet connection to avoid errors.
4. VLC will download the necessary files for the update. Once complete, you'll see "The new version was successfully downloaded. Do you want to close VLC and install it now?" Click Install.
5. Follow the on-screen instructions to update VLC. After installation, attempt to play the problematic Blu-ray file.

Solution 3. Check if your files are damaged

It's unsettling, but your Blu-ray disc's media might be damaged. If so, you won't be able to access its content, and recovery might be impossible.

To check if your file is intact, try using another media player like Potplayer or MPC-BE, which are excellent alternatives to VLC.

If the issue persists with other players, try playing the disc on a different device (another PC, laptop, or Mac). If you still encounter errors, it's likely that your file is damaged.

Before you go…

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If our tips helped you fix the "This Blu-ray disc needs a library for AACS decoding" error, explore more tips, tricks, and troubleshooting guides in our Help Center!

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