Error message "Mpeg-4 AAC decoder not installed" when playing video on Ubuntu 18.04.3 in VirtualBox

 The error message "Mpeg-4 AAC decoder not installed" typically indicates that your media player does not have the necessary codec to decode the audio in the video file. You can resolve this issue on Ubuntu 18.04 in VirtualBox by installing the appropriate codec and ensuring that your media player can use it.


Here are the steps to follow:


1. **Install Ubuntu Restricted Extras:**

   - Open a terminal window.

   - Run the following command to install the "ubuntu-restricted-extras" package, which includes various codecs and fonts:

     ```

     sudo apt-get install ubuntu-restricted-extras

     ```

   - During the installation process, you may be asked to accept license agreements for some of the included codecs. Follow the prompts to agree.


2. **Restart Your Media Player:**

   - After installing the restricted extras, restart your media player (e.g., VLC) and try playing the video again.


3. **Use VLC Media Player:** If you're not already using VLC, consider installing VLC Media Player, which includes a wide range of codecs and can often play various media formats out of the box. You can install VLC with this command:

   ```

   sudo apt-get install vlc

   ```

   Once installed, open your video with VLC and see if the issue is resolved.


4. **Check Video Format:** Ensure that the video format is indeed supported by the installed codecs. Some rare or proprietary formats may require additional codecs or third-party software.


If you're still experiencing issues after following these steps, you may want to check the video file itself. It's possible that the file is corrupted or uses an uncommon codec that may require additional configuration or codec installation.

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